{"id":2202,"date":"2026-09-15T02:27:52","date_gmt":"2026-09-15T02:27:52","guid":{"rendered":"https:\/\/haktak.com\/?p=2202"},"modified":"2026-09-15T02:27:54","modified_gmt":"2026-09-15T02:27:54","slug":"avoid-voids-thermal-putty","status":"publish","type":"post","link":"https:\/\/haktak.com\/vi\/avoid-voids-thermal-putty\/","title":{"rendered":"C\u00e1ch tr\u00e1nh b\u1ecdt kh\u00ed khi s\u1eed d\u1ee5ng keo t\u1ea3n nhi\u1ec7t d\u1ea1ng \u0111\u1ea5t n\u1eb7n"},"content":{"rendered":"<div class=\"product\"><div class=\"product\">\n<p class=\"wp-block-paragraph\">Vi\u1ec7c b\u01a1m keo tr\u00e9t t\u1ea3n nhi\u1ec7t c\u00f3 ph\u1ea7n gi\u1ed1ng nh\u01b0 x\u1ebfp \u0111\u1ed3 v\u00e0o vali. N\u1ebfu kh\u00f4ng kh\u00ed kh\u00f4ng c\u00f3 \u0111\u01b0\u1eddng tho\u00e1t, \u1ea5n n\u1eafp m\u1ea1nh h\u01a1n c\u00f3 th\u1ec3 ch\u1ec9 khi\u1ebfn v\u1eadt li\u1ec7u tr\u00e0n ra quanh m\u00e9p nhi\u1ec1u h\u01a1n. M\u1ed9t l\u01b0\u1ee3ng l\u1edbn v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c b\u01a1m gi\u1eefa linh ki\u1ec7n v\u00e0 b\u1ed9 t\u1ea3n nhi\u1ec7t v\u1eabn c\u00f3 th\u1ec3 \u0111\u1ec3 l\u1ea1i t\u00fai kh\u00ed \u1edf gi\u1eefa, kh\u00f4ng ti\u1ebfp x\u00fac v\u1edbi linh ki\u1ec7n th\u1ea5p ho\u1eb7c l\u1ea5n v\u00e0o v\u00f9ng c\u1ea5m. M\u1ee5c ti\u00eau th\u1ef1c s\u1ef1 l\u00e0 ki\u1ec3m so\u00e1t b\u1ec1 m\u1eb7t ti\u1ebfp x\u00fac; v\u00ec v\u1eady, vi\u1ec7c ng\u0103n ng\u1eeba l\u1ed7 r\u1ed7ng ph\u1ea3i b\u1eaft \u0111\u1ea7u tr\u01b0\u1edbc khi \u0111\u1ea7u phun di chuy\u1ec3n v\u00e0 ti\u1ebfp t\u1ee5c sau khi c\u00e1c v\u00edt \u0111\u01b0\u1ee3c si\u1ebft ch\u1eb7t.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"900\" height=\"506\" src=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-62.png\" alt=\"C\u00e1ch tr\u00e1nh kho\u1ea3ng r\u1ed7ng trong keo t\u1ea3n nhi\u1ec7t d\u1ea1ng putty\" class=\"wp-image-2204\" srcset=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-62.png 900w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-62-300x169.png 300w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-62-18x10.png 18w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-62-767x431.png 767w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-62-599x337.png 599w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Th\u1ebf n\u00e0o \u0111\u01b0\u1ee3c xem l\u00e0 l\u1ed7 r\u1ed7ng trong l\u1edbp ti\u1ebfp x\u00fac b\u1eb1ng keo tr\u00e9t t\u1ea3n nhi\u1ec7t?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Kho\u1ea3ng r\u1ed7ng l\u00e0 khu v\u1ef1c m\u00e0 v\u1eadt li\u1ec7u giao di\u1ec7n nhi\u1ec7t kh\u00f4ng t\u1ea1o \u0111\u01b0\u1ee3c ti\u1ebfp x\u00fac nh\u01b0 d\u1ef1 ki\u1ebfn. \u0110\u1ecbnh ngh\u0129a n\u00e0y nghe c\u00f3 v\u1ebb \u0111\u01a1n gi\u1ea3n, nh\u01b0ng tr\u00ean th\u1ef1c t\u1ebf s\u1ea3n xu\u1ea5t, nhi\u1ec1u d\u1ea1ng khuy\u1ebft t\u1eadt kh\u00e1c nhau c\u0169ng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u201ckho\u1ea3ng r\u1ed7ng\u201d.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A <strong>l\u1ed7 r\u1ed7ng v\u0129 m\u00f4<\/strong> is a visible air pocket inside the compressed deposit.<\/li>\n\n\n\n<li>A <strong>micro-gap<\/strong> comes from surface roughness, contamination, or weak wet-out.<\/li>\n\n\n\n<li>A <strong>skipped area<\/strong> is a location that never received enough material.<\/li>\n\n\n\n<li><strong>Edge<\/strong> <strong>starvation<\/strong> occurs when material is pulled or squeezed away from a boundary.<\/li>\n\n\n\n<li>A <strong>cure bubble<\/strong> forms when air or volatile material expands inside a curing two-part gap filler.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These defects do not share one cause. A center void suggests trapped air during closure. Random cure pinholes point toward mixing, supply, or outgassing. One low VRAM package with no transfer mark suggests tolerance or placement. Location matters too: a small void over a MOSFET hot spot may matter more than a larger one over a cool corner. Evaluate <a href=\"https:\/\/haktak.com\/vi\/thermal-conductivity-vs-thermal-impedance-tim-selection\/\">\u0111\u1ed9 d\u1eabn nhi\u1ec7t so v\u1edbi tr\u1edf kh\u00e1ng nhi\u1ec7t<\/a> at the assembled interface, not by one material number.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"900\" height=\"506\" src=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-63.png\" alt=\"C\u00e1ch tr\u00e1nh kho\u1ea3ng r\u1ed7ng trong keo t\u1ea3n nhi\u1ec7t d\u1ea1ng putty\" class=\"wp-image-2205\" srcset=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-63.png 900w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-63-18x10.png 18w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-63-300x169.png 300w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-63-599x337.png 599w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-63-767x431.png 767w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Why Thermal Putty Voids Form at Five Different Stages<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Several small variations often stack up: cool material, a narrow bead, and a slightly tilted heat sink. Each looks harmless alone. Together, well, there is your void.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\">Formation stage<\/td><td class=\"has-text-align-left\" data-align=\"left\">Typical evidence<\/td><td class=\"has-text-align-left\" data-align=\"left\">Likely root cause<\/td><td class=\"has-text-align-left\" data-align=\"left\">First check<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Material condition<\/td><td class=\"has-text-align-left\" data-align=\"left\">Stiff flow, separation, inconsistent spread<\/td><td class=\"has-text-align-left\" data-align=\"left\">Poor storage, insufficient conditioning, age, contamination<\/td><td class=\"has-text-align-left\" data-align=\"left\">Lot, shelf life, storage record, material temperature<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Supply system<\/td><td class=\"has-text-align-left\" data-align=\"left\">B\u1ecdt kh\u00ed xu\u1ea5t hi\u1ec7n ng\u1eabu nhi\u00ean ho\u1eb7c k\u00edch th\u01b0\u1edbc \u0111\u01b0\u1eddng keo thay \u0111\u1ed5i<\/td><td class=\"has-text-align-left\" data-align=\"left\">Kh\u00f4ng kh\u00ed l\u1ecdt v\u00e0o khi thay h\u1ed9p m\u1ef1c ho\u1eb7c th\u00f9ng ch\u1ee9a, \u00e1p su\u1ea5t c\u1ea5p li\u1ec7u kh\u00f4ng \u1ed5n \u0111\u1ecbnh, \u0111\u1ea7u n\u1ed1i b\u1ecb r\u00f2 r\u1ec9<\/td><td class=\"has-text-align-left\" data-align=\"left\">K\u1ebft qu\u1ea3 x\u1ea3, xu h\u01b0\u1edbng \u00e1p su\u1ea5t, t\u00ecnh tr\u1ea1ng \u1ed1ng m\u1ec1m v\u00e0 ph\u1edbt<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">\u0110\u1ecbnh l\u01b0\u1ee3ng ho\u1eb7c tr\u1ed9n<\/td><td class=\"has-text-align-left\" data-align=\"left\">L\u1ed7 kim sau \u0111\u00f3ng r\u1eafn, v\u00f9ng m\u1ec1m, sai l\u1ec7ch t\u1ef7 l\u1ec7<\/td><td class=\"has-text-align-left\" data-align=\"left\">Worn pump, damaged static mixer, wrong A\/B ratio, expired pot life<\/td><td class=\"has-text-align-left\" data-align=\"left\">Ratio check, mixer condition, cure sample<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Deposit<\/td><td class=\"has-text-align-left\" data-align=\"left\">Center gap, skipped corner, broken bead<\/td><td class=\"has-text-align-left\" data-align=\"left\">Wrong pattern or volume, high stand-off, start-stop defect<\/td><td class=\"has-text-align-left\" data-align=\"left\">Bead width, height, location, continuity<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Assembly closure<\/td><td class=\"has-text-align-left\" data-align=\"left\">Repeatable void on one side, poor transfer<\/td><td class=\"has-text-align-left\" data-align=\"left\">Tilt, lateral sliding, fast closure, torque sequence, hard stops<\/td><td class=\"has-text-align-left\" data-align=\"left\">Closure path, parallelism, screw sequence, final gap<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Tr\u1ea1ng th\u00e1i v\u1eadt li\u1ec7u l\u00e0m thay \u0111\u1ed5i c\u00e1ch kh\u00f4ng kh\u00ed d\u1ecbch chuy\u1ec3n<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">H\u1ea7u h\u1ebft <a href=\"https:\/\/haktak.com\/vi\/liquid-gap-filler\/thermal-putty\/\">keo tr\u00e9t d\u1eabn nhi\u1ec7t d\u00f9ng cho thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed<\/a> c\u00f3 h\u00e0m l\u01b0\u1ee3ng ch\u1ea5t \u0111\u1ed9n cao v\u00e0 gi\u1eef \u0111\u01b0\u1ee3c h\u00ecnh d\u1ea1ng. V\u1eadt li\u1ec7u n\u00e0y c\u00f3 th\u1ec3 l\u00e0 h\u1ee3p ch\u1ea5t kh\u00f4ng \u0111\u00f3ng r\u1eafn, v\u1eadt li\u1ec7u d\u1ea1ng gel \u0111\u01b0\u1ee3c \u0111\u00f3ng r\u1eafn tr\u01b0\u1edbc ho\u1eb7c h\u1ec7 \u0111\u00f3ng r\u1eafn t\u1ea1i ch\u1ed7. Nhi\u1ec7t \u0111\u1ed9, t\u00ednh x\u00fac bi\u1ebfn, \u1ee9ng su\u1ea5t ch\u1ea3y, h\u00e0m l\u01b0\u1ee3ng ch\u1ea5t \u0111\u1ed9n v\u00e0 \u0111i\u1ec1u ki\u1ec7n b\u1ea3o qu\u1ea3n \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u1ea3 n\u0103ng d\u00e0n tr\u1ea3i c\u1ee7a v\u1eadt li\u1ec7u. V\u1eadt li\u1ec7u l\u1ea1nh c\u00f3 th\u1ec3 c\u1ea7n l\u1ef1c l\u1edbn h\u01a1n \u0111\u1ec3 l\u00e0m \u01b0\u1edbt b\u1ec1 m\u1eb7t, trong khi vi\u1ec7c nh\u00e0o \u1ed1ng ch\u1ee9a b\u1eb1ng tay c\u00f3 th\u1ec3 cu\u1ed1n kh\u00f4ng kh\u00ed v\u00e0o v\u1eadt li\u1ec7u.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kh\u00f4ng khu\u1ea5y, gia nhi\u1ec7t ho\u1eb7c kh\u1eed kh\u00ed ch\u00e2n kh\u00f4ng \u0111\u1ed1i v\u1edbi keo tr\u00e9t m\u1ed9t th\u00e0nh ph\u1ea7n \u0111\u01b0\u1ee3c cung c\u1ea5p, tr\u1eeb khi t\u00e0i li\u1ec7u k\u1ef9 thu\u1eadt ho\u1eb7c nh\u00e0 cung c\u1ea5p cho ph\u00e9p. Nh\u00e0 cung c\u1ea5p c\u00f3 th\u1ec3 \u0111\u00e3 \u0111\u00f3ng g\u00f3i v\u1eadt li\u1ec7u theo quy tr\u00ecnh \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t. M\u1ed9t bi\u1ec7n ph\u00e1p x\u1eed l\u00fd t\u1ea1i x\u01b0\u1edfng d\u00f9 c\u00f3 \u00fd t\u1ed1t c\u0169ng c\u00f3 th\u1ec3 l\u00e0m m\u1ea5t t\u00e1c d\u1ee5ng c\u1ee7a quy tr\u00ecnh \u0111\u00f3.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">H\u1ec7 th\u1ed1ng c\u1ea5p li\u1ec7u c\u00f3 th\u1ec3 \u0111\u01b0a kh\u00f4ng kh\u00ed v\u00e0o v\u1eadt li\u1ec7u tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u b\u01a1m keo<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Vi\u1ec7c n\u1ea1p cartridge, thay x\u00f4 ch\u1ee9a, k\u1ebft n\u1ed1i \u1ed1ng, hi\u1ec7n t\u01b0\u1ee3ng dao \u0111\u1ed9ng c\u1ee7a b\u01a1m v\u00e0 \u00e1p su\u1ea5t c\u1ea5p li\u1ec7u \u0111\u1ec1u c\u00f3 \u1ea3nh h\u01b0\u1edfng. M\u1ed9t b\u1ecdt kh\u00ed \u1edf ph\u00eda th\u01b0\u1ee3ng ngu\u1ed3n c\u00f3 th\u1ec3 di chuy\u1ec3n qua nhi\u1ec1u chu k\u1ef3 tr\u01b0\u1edbc khi \u0111\u1ebfn \u0111\u1ea7u phun, khi\u1ebfn nguy\u00ean nh\u00e2n c\u00f3 t\u00ednh l\u1eb7p l\u1ea1i tr\u00f4ng nh\u01b0 ng\u1eabu nhi\u00ean.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u1eadt li\u1ec7u l\u1ea5p khe ch\u1ee9a h\u00e0m l\u01b0\u1ee3ng ch\u1ea5t \u0111\u1ed9n cao c\u0169ng c\u00f3 t\u00ednh m\u00e0i m\u00f2n. DOPAG l\u01b0u \u00fd r\u1eb1ng v\u1eadt li\u1ec7u d\u1eabn nhi\u1ec7t c\u00f3 th\u1ec3 ch\u1ee9a c\u00e1c ch\u1ea5t \u0111\u1ed9n nh\u01b0 nh\u00f4m oxit v\u00e0 c\u00f3 th\u1ec3 y\u00eau c\u1ea7u c\u00e1c b\u1ed9 ph\u1eadn \u0111\u1ecbnh l\u01b0\u1ee3ng c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n. Ph\u1ea7n t\u1ed5ng quan v\u1ec1 <a href=\"https:\/\/www.dopag.com\/applications\/application-cases\/dispensing-thermal-gap-fillers\/\" target=\"_blank\" rel=\"noopener\">vi\u1ec7c b\u01a1m r\u00f3t v\u1eadt li\u1ec7u l\u1ea5p khe d\u1eabn nhi\u1ec7t<\/a> l\u00e0 m\u1ed9t l\u1eddi nh\u1eafc h\u1eefu \u00edch: t\u00ecnh tr\u1ea1ng c\u1ee7a b\u01a1m v\u00e0 van l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a ch\u1ea5t l\u01b0\u1ee3ng truy\u1ec1n nhi\u1ec7t, kh\u00f4ng ch\u1ec9 l\u00e0 v\u1ea5n \u0111\u1ec1 b\u1ea3o tr\u00ec thi\u1ebft b\u1ecb.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed1i v\u1edbi m\u1ed9t <a href=\"https:\/\/haktak.com\/vi\/liquid-gap-filler\/single-component-thermal-gel\/\">keo t\u1ea3n nhi\u1ec7t m\u1ed9t th\u00e0nh ph\u1ea7n<\/a>, ki\u1ec3m tra vi\u1ec7c l\u1eafp cartridge \u0111\u00fang v\u1ecb tr\u00ed, l\u01b0\u1ee3ng kh\u00ed m\u1eafc k\u1eb9t g\u1ea7n piston, \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh \u00e1p su\u1ea5t v\u00e0 quy t\u1eafc x\u1ea3 v\u1eadt li\u1ec7u. \u0110\u1ed1i v\u1edbi ngu\u1ed3n c\u1ea5p v\u1eadt li\u1ec7u d\u1ea1ng r\u1eddi, b\u1ed5 sung vi\u1ec7c l\u00e0m k\u00edn b\u1eb1ng t\u1ea5m \u00e9p, quy tr\u00ecnh thay th\u00f9ng v\u00e0 x\u1ea3 v\u1eadt li\u1ec7u trong \u1ed1ng v\u00e0o danh s\u00e1ch.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">V\u1eadt li\u1ec7u l\u1ea5p khe h\u1edf hai th\u00e0nh ph\u1ea7n: r\u1ee7i ro v\u1ec1 tr\u1ed9n v\u00e0 \u0111\u00f3ng r\u1eafn<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Hai th\u00e0nh ph\u1ea7n <a href=\"https:\/\/haktak.com\/vi\/liquid-gap-filler\/thermal-conductive-gap-fillers\/\">t\u1ea5m \u0111\u1ec7m t\u1ea3n nhi\u1ec7t<\/a> b\u1ed5 sung c\u00e1c bi\u1ec7n ph\u00e1p ki\u1ec3m so\u00e1t t\u1ef7 l\u1ec7 A\/B, t\u00ecnh tr\u1ea1ng b\u1ed9 tr\u1ed9n, v\u1eadt li\u1ec7u sau khi kh\u1edfi \u0111\u1ed9ng l\u1ea1i, th\u1eddi gian s\u1eed d\u1ee5ng, qu\u00e1 tr\u00ecnh \u0111\u00f3ng r\u1eafn v\u00e0 hi\u1ec7n t\u01b0\u1ee3ng tho\u00e1t kh\u00ed. N\u1ebfu bong b\u00f3ng ch\u1ec9 xu\u1ea5t hi\u1ec7n sau khi \u0111\u00f3ng r\u1eafn, h\u00e3y ki\u1ec3m tra m\u1eabu m\u1edbi tr\u1ed9n b\u00ean ngo\u00e0i c\u1ee5m l\u1eafp r\u00e1p. C\u00e1ch n\u00e0y gi\u00fap ph\u00e2n bi\u1ec7t l\u1ed7i h\u00f3a h\u1ecdc ho\u1eb7c l\u1ed7i tr\u1ed9n v\u1edbi kh\u00f4ng kh\u00ed b\u1ecb m\u1eafc k\u1eb9t trong qu\u00e1 tr\u00ecnh n\u00e9n.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"900\" height=\"506\" src=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-64.png\" alt=\"C\u00e1ch tr\u00e1nh kho\u1ea3ng r\u1ed7ng trong keo t\u1ea3n nhi\u1ec7t d\u1ea1ng putty\" class=\"wp-image-2206\" srcset=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-64.png 900w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-64-18x10.png 18w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-64-300x169.png 300w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-64-767x431.png 767w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-64-599x337.png 599w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">B\u1eaft \u0111\u1ea7u v\u1edbi v\u1eadt li\u1ec7u v\u00e0 c\u00f4ng t\u00e1c chu\u1ea9n b\u1ecb b\u1ec1 m\u1eb7t<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1edbc khi thay \u0111\u1ed5i ch\u01b0\u01a1ng tr\u00ecnh robot, h\u00e3y x\u00e1c nh\u1eadn nh\u1eefng \u0111i\u1ec1u c\u01a1 b\u1ea3n. C\u00f3 v\u1ebb nh\u00e0m ch\u00e1n, \u0111\u00fang v\u1eady, nh\u01b0ng r\u1ea5t h\u1eefu \u00edch.<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>X\u00e1c minh c\u1ea5p v\u1eadt li\u1ec7u, l\u00f4, h\u1ea1n s\u1eed d\u1ee5ng, \u0111i\u1ec1u ki\u1ec7n b\u1ea3o qu\u1ea3n v\u00e0 quy tr\u00ecnh \u0111\u01b0a v\u1ec1 \u0111i\u1ec1u ki\u1ec7n s\u1eed d\u1ee5ng \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t.<\/li>\n\n\n\n<li>Ki\u1ec3m tra hi\u1ec7n t\u01b0\u1ee3ng t\u00e1ch l\u1edbp, c\u00e1c n\u00fat kh\u00f4 ho\u1eb7c bao b\u00ec b\u1ecb h\u01b0 h\u1ecfng.<\/li>\n\n\n\n<li>L\u00e0m s\u1ea1ch c\u1ea3 hai b\u1ec1 m\u1eb7t ti\u1ebfp x\u00fac b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t.<\/li>\n\n\n\n<li>\u0110o kho\u1ea3ng h\u1edf t\u1ed1i thi\u1ec3u, danh \u0111\u1ecbnh v\u00e0 t\u1ed1i \u0111a.<\/li>\n\n\n\n<li>Ki\u1ec3m tra \u0111\u1ed9 ph\u1eb3ng, chi\u1ec1u cao linh ki\u1ec7n, c\u00e1c g\u00e2n v\u00e0 c\u1eef ch\u1eb7n c\u01a1 kh\u00ed.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Kh\u00f4ng \u0111\u01b0\u1ee3c m\u1eb7c \u0111\u1ecbnh khe h\u1edf CAD l\u00e0 khe h\u1edf trong s\u1ea3n xu\u1ea5t. \u0110\u1ed9 v\u00eanh PCB, sai l\u1ec7ch \u0111\u00fac, dung sai linh ki\u1ec7n v\u00e0 l\u1ef1c n\u00e9n c\u1ee7a v\u00edt c\u00f3 th\u1ec3 l\u00e0m thay \u0111\u1ed5i khe h\u1edf n\u00e0y. B\u1ee5i c\u00f3 th\u1ec3 khi\u1ebfn c\u00e1c b\u1ec1 m\u1eb7t kh\u00f4ng ti\u1ebfp x\u00fac, trong khi d\u1ea7u c\u00f3 th\u1ec3 l\u00e0m b\u1ec1 m\u1eb7t tr\u00f4ng nh\u01b0 b\u1ecb \u01b0\u1edbt nh\u01b0ng ti\u1ebfp x\u00fac kh\u00f4ng \u1ed5n \u0111\u1ecbnh. Vi\u1ec7c l\u00e0m s\u1ea1ch ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi v\u1eadt li\u1ec7u putty v\u00e0 v\u1eadt li\u1ec7u n\u1ec1n.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"506\" src=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-65.png\" alt=\"C\u00e1ch tr\u00e1nh kho\u1ea3ng r\u1ed7ng trong keo t\u1ea3n nhi\u1ec7t d\u1ea1ng putty\" class=\"wp-image-2207\" srcset=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-65.png 900w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-65-18x10.png 18w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-65-300x169.png 300w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-65-599x337.png 599w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-65-767x431.png 767w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Ch\u1ecdn ki\u1ec3u b\u01a1m keo t\u1ea1o l\u1ed1i tho\u00e1t cho kh\u00f4ng kh\u00ed<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Kh\u00f4ng c\u00f3 ki\u1ec3u b\u01a1m n\u00e0o l\u00e0 c\u00f4ng th\u1ee9c v\u1ea1n n\u0103ng. H\u00ecnh d\u1ea1ng ban \u0111\u1ea7u ph\u1ee5 thu\u1ed9c v\u00e0o di\u1ec7n t\u00edch bao ph\u1ee7, t\u00ednh l\u01b0u bi\u1ebfn, khe h\u1edf, \u0111\u1ecba h\u00ecnh b\u1ec1 m\u1eb7t, h\u01b0\u1edbng \u0111\u00f3ng v\u00e0 \u0111\u1ed9 n\u00e9n. H\u00e3y h\u00ecnh dung kem \u0111\u00e1nh r\u0103ng b\u00ean d\u01b0\u1edbi m\u1ed9t t\u1ea5m k\u00ednh trong: m\u1ed9t \u0111\u01b0\u1eddng keo ng\u1eafn c\u00f3 th\u1ec3 lan ra ngo\u00e0i, trong khi m\u1ed9t v\u00f2ng kh\u00e9p k\u00edn c\u00f3 th\u1ec3 d\u1ed3n kh\u00f4ng kh\u00ed v\u00e0o gi\u1eefa. B\u1ed9t tr\u00e9t kh\u00f4ng ho\u00e0n to\u00e0n gi\u1ed1ng kem \u0111\u00e1nh r\u0103ng, nh\u01b0ng \u00fd t\u01b0\u1edfng v\u1ec1 \u0111\u01b0\u1eddng tho\u00e1t v\u1eabn ph\u00f9 h\u1ee3p.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\">H\u00ecnh h\u1ecdc b\u1ec1 m\u1eb7t ti\u1ebfp x\u00fac<\/td><td class=\"has-text-align-left\" data-align=\"left\">Ki\u1ec3u b\u01a1m ban \u0111\u1ea7u ph\u00f9 h\u1ee3p<\/td><td class=\"has-text-align-left\" data-align=\"left\">R\u1ee7i ro ch\u00ednh<\/td><td class=\"has-text-align-left\" data-align=\"left\">Ph\u01b0\u01a1ng ph\u00e1p ki\u1ec3m ch\u1ee9ng<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Linh ki\u1ec7n d\u1ea1ng ph\u1eb3ng, k\u00edch th\u01b0\u1edbc nh\u1ecf<\/td><td class=\"has-text-align-left\" data-align=\"left\">Ch\u1ea5m trung t\u00e2m ho\u1eb7c \u0111\u01b0\u1eddng keo ng\u1eafn<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u0110\u1ed9 ph\u1ee7 kh\u00f4ng \u0111\u1ee7 \u1edf c\u00e1c g\u00f3c<\/td><td class=\"has-text-align-left\" data-align=\"left\">M\u1eabu th\u1eed trong su\u1ed1t ho\u1eb7c c\u1ea5u tr\u00fac chuy\u1ec3n keo<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">V\u00f9ng h\u00ecnh ch\u1eef nh\u1eadt d\u00e0i<\/td><td class=\"has-text-align-left\" data-align=\"left\">C\u00e1c \u0111\u01b0\u1eddng keo d\u00e0i ho\u1eb7c c\u00e1c \u0111\u01b0\u1eddng keo song song c\u00f3 kho\u1ea3ng c\u00e1ch<\/td><td class=\"has-text-align-left\" data-align=\"left\">Kh\u00f4ng kh\u00ed b\u1ecb m\u1eafc k\u1eb9t gi\u1eefa c\u00e1c \u0111\u01b0\u1eddng keo n\u1ed1i li\u1ec1n nhau<\/td><td class=\"has-text-align-left\" data-align=\"left\">M\u1eabu th\u1eed ki\u1ec3m ch\u1ee9ng \u0111\u01b0\u1ee3c c\u1eaft v\u00e0 th\u1eed nghi\u1ec7m nhi\u1ec7t<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">C\u00e1c linh ki\u1ec7n c\u00f3 chi\u1ec1u cao kh\u00e1c nhau<\/td><td class=\"has-text-align-left\" data-align=\"left\">C\u00e1c ch\u1ea5m keo ho\u1eb7c \u0111\u01b0\u1eddng keo ng\u1eafn \u0111\u01b0\u1ee3c b\u1ed1 tr\u00ed theo t\u1eebng v\u00f9ng chi\u1ec1u cao<\/td><td class=\"has-text-align-left\" data-align=\"left\">C\u00e1c linh ki\u1ec7n th\u1ea5p v\u1eabn kh\u00f4ng b\u1ecb ch\u1ea1m v\u00e0o<\/td><td class=\"has-text-align-left\" data-align=\"left\">D\u1ea5u v\u1ebft truy\u1ec1n v\u1eadt li\u1ec7u \u1edf c\u00e1c gi\u1edbi h\u1ea1n dung sai<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">T\u1ea5m l\u00e0m m\u00e1t l\u1edbn ho\u1eb7c k\u00eanh pin<\/td><td class=\"has-text-align-left\" data-align=\"left\">C\u00e1c \u0111\u01b0\u1eddng keo song song \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t ho\u1eb7c \u0111\u01b0\u1eddng keo u\u1ed1n l\u01b0\u1ee3n m\u1edf<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u0110\u01b0\u1eddng keo b\u1ecb \u0111\u1ee9t, h\u1ee3p d\u00f2ng kh\u00f4ng \u0111\u1ec1u, qu\u00e3ng \u0111\u01b0\u1eddng ch\u1ea3y d\u00e0i<\/td><td class=\"has-text-align-left\" data-align=\"left\">Qu\u00e9t 3D \u0111\u01b0\u1eddng keo v\u00e0 ki\u1ec3m tra ph\u00e1 h\u1ee7y s\u1ea3n ph\u1ea9m \u0111\u1ea7u ti\u00ean<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">B\u1ec1 m\u1eb7t ti\u1ebfp gi\u00e1p nh\u1ecf, ph\u1eb3ng<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed9t ch\u1ea5m trung t\u00e2m ho\u1eb7c \u0111\u01b0\u1eddng ng\u1eafn c\u00f3 th\u1ec3 cho ph\u00e9p v\u1eadt li\u1ec7u d\u1ecbch chuy\u1ec3n ra ngo\u00e0i khi kh\u00f4ng kh\u00ed tho\u00e1t ra \u1edf chu vi. X\u00e1c nh\u1eadn \u0111\u1ed9 ph\u1ee7 t\u1ea1i c\u00e1c g\u00f3c v\u00e0 chi\u1ec1u d\u00e0y \u1edf c\u00e1c kho\u1ea3ng h\u1edf nh\u1ecf nh\u1ea5t v\u00e0 l\u1edbn nh\u1ea5t.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">B\u1ec1 m\u1eb7t ti\u1ebfp gi\u00e1p d\u00e0i ho\u1eb7c h\u00ecnh ch\u1eef nh\u1eadt<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u01b0\u1eddng keo d\u00e0i, \u0111\u01b0\u1eddng keo u\u1ed1n l\u01b0\u1ee3n h\u1edf ho\u1eb7c c\u00e1c \u0111\u01b0\u1eddng keo song song c\u00f3 th\u1ec3 r\u00fat ng\u1eafn kho\u1ea3ng c\u00e1ch d\u00f2ng ch\u1ea3y. Tr\u00e1nh c\u00e1c v\u00f2ng kh\u00e9p k\u00edn, tr\u1eeb khi th\u1eed nghi\u1ec7m ch\u1ee9ng minh \u0111\u01b0\u1ee3c v\u00f9ng trung t\u00e2m c\u00f3 th\u1ec3 tho\u00e1t kh\u00ed. \u0110\u1ed3ng th\u1eddi ki\u1ec3m tra \u0111\u01b0\u1eddng n\u1ed1i n\u01a1i c\u00e1c \u0111\u01b0\u1eddng keo song song h\u1ee3p l\u1ea1i.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Mixed-Height Component Fields<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Map the heat sources and height zones across VRAM, VRM, chokes, and controllers. Reach low points without loading delicate tall components with excessive force.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Large Battery and Cold-Plate Areas<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">CPU paste tricks do not scale neatly to a battery module. Control bead spacing, robot speed, corner turns, starts, stops, and closure direction. Use 3D vision and periodic witness builds, not one pretty bead.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Control the Whole Dispensing and Closing Process<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"506\" src=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-66.png\" alt=\"C\u00e1ch tr\u00e1nh kho\u1ea3ng r\u1ed7ng trong keo t\u1ea3n nhi\u1ec7t d\u1ea1ng putty\" class=\"wp-image-2208\" srcset=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-66.png 900w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-66-300x169.png 300w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-66-18x10.png 18w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-66-599x337.png 599w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-66-767x431.png 767w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Stabilize Feed and Bead Geometry<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Document start-up and pail-change purges. Trend feed pressure, inspect nozzle wear, and tune suck-back without drawing air into the tip. Verify shot weight or metered volume alongside bead location, width, height, and continuity. Quantity cannot prove placement, while a camera may miss a low bead. Use both.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Close the Assembly the Same Way Every Time<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The top part should meet the deposit along a controlled path. A tilted heat sink can seal one edge first; lateral sliding may scrape material away. Use alignment features, defined speed and dwell, and a validated screw sequence. Where possible, tighten in small cross-pattern steps.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Record material lot, package time, recipe, shot, closure, torque, alarms, and maintenance. When a field unit runs hot six months later, \u201cthe bead looked fine\u201d is not much of a record.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"506\" src=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-67.png\" alt=\"C\u00e1ch tr\u00e1nh kho\u1ea3ng r\u1ed7ng trong keo t\u1ea3n nhi\u1ec7t d\u1ea1ng putty\" class=\"wp-image-2209\" srcset=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-67.png 900w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-67-18x10.png 18w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-67-300x169.png 300w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-67-599x337.png 599w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-67-767x431.png 767w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Does More Thermal Putty Reduce Voids?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Not by itself. Underfill can leave obvious missed areas. Correct fill covers the target at the validated final gap. Overfill may create excessive squeeze-out, raise assembly force, contaminate connectors, or hold another interface open.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Estimate volume from footprint area and expected gap, then adjust for surface features and validated squeeze-out. Physical trials are still required. Actual <a href=\"https:\/\/haktak.com\/vi\/how-bond-line-thickness-affects-thermal-performance\/\">\u0111\u1ed9 d\u00e0y li\u00ean k\u1ebft<\/a> is controlled by the assembly, not the syringe label.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">More conductive filler or a higher advertised W\/m\u00b7K value does not automatically rescue poor coverage either. The article on <a href=\"https:\/\/haktak.com\/vi\/why-high-wmk-does-not-always-mean-better-cooling-performance\/\">why high W\/m\u00b7K does not always mean better cooling<\/a> explains the practical reason: interface thickness, wet-out, contact resistance, and assembly conditions all join the party.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Detect Voids Before and After Assembly<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">No single inspection method sees everything. Use a layered plan.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\">Ph\u01b0\u01a1ng ph\u00e1p<\/td><td class=\"has-text-align-left\" data-align=\"left\">What it can show<\/td><td class=\"has-text-align-left\" data-align=\"left\">Main limitation<\/td><td class=\"has-text-align-left\" data-align=\"left\">S\u1eed d\u1ee5ng t\u1ed1t nh\u1ea5t<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">2D vision<\/td><td class=\"has-text-align-left\" data-align=\"left\">Bead position, width, breaks, gross contamination<\/td><td class=\"has-text-align-left\" data-align=\"left\">Little height or hidden-interface information<\/td><td class=\"has-text-align-left\" data-align=\"left\">Routine pre-assembly screening<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">3D vision or laser profile<\/td><td class=\"has-text-align-left\" data-align=\"left\">Bead height, shape, estimated volume<\/td><td class=\"has-text-align-left\" data-align=\"left\">Cannot prove the compressed contact area<\/td><td class=\"has-text-align-left\" data-align=\"left\">Automated process control<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Shot weight or flow monitoring<\/td><td class=\"has-text-align-left\" data-align=\"left\">Missing shot and gradual quantity drift<\/td><td class=\"has-text-align-left\" data-align=\"left\">Cannot prove correct location or spreading<\/td><td class=\"has-text-align-left\" data-align=\"left\">Every-cycle monitoring<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Witness or transfer build<\/td><td class=\"has-text-align-left\" data-align=\"left\">Real spread and contact pattern<\/td><td class=\"has-text-align-left\" data-align=\"left\">Destructive and slower<\/td><td class=\"has-text-align-left\" data-align=\"left\">Development, first article, change validation<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">X-ray or CT<\/td><td class=\"has-text-align-left\" data-align=\"left\">Internal features where contrast and geometry allow<\/td><td class=\"has-text-align-left\" data-align=\"left\">Cost, cycle time, resolution, material contrast<\/td><td class=\"has-text-align-left\" data-align=\"left\">Failure analysis and high-risk samples<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Thermal test or IR image<\/td><td class=\"has-text-align-left\" data-align=\"left\">Hot spots and poor overall heat transfer<\/td><td class=\"has-text-align-left\" data-align=\"left\">Does not identify the unique root cause<\/td><td class=\"has-text-align-left\" data-align=\"left\">Device validation and diagnosis<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A sound plan combines pre-assembly vision, a destructive transfer study, and a thermal test. Add X-ray, CT, or a suitable acoustic method for high-risk parts when material and geometry permit.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"506\" src=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-68.png\" alt=\"C\u00e1ch tr\u00e1nh kho\u1ea3ng r\u1ed7ng trong keo t\u1ea3n nhi\u1ec7t d\u1ea1ng putty\" class=\"wp-image-2210\" srcset=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-68.png 900w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-68-300x169.png 300w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-68-18x10.png 18w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-68-767x431.png 767w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-68-599x337.png 599w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Troubleshoot the Shape of the Void, Not Just Its Presence<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\">Observed defect<\/td><td class=\"has-text-align-left\" data-align=\"left\">Nguy\u00ean nh\u00e2n c\u00f3 kh\u1ea3 n\u0103ng cao<\/td><td class=\"has-text-align-left\" data-align=\"left\">Evidence to collect<\/td><td class=\"has-text-align-left\" data-align=\"left\">Corrective direction<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Repeated center void<\/td><td class=\"has-text-align-left\" data-align=\"left\">Closed pattern or perimeter sealing too early<\/td><td class=\"has-text-align-left\" data-align=\"left\">Transfer image and closure video<\/td><td class=\"has-text-align-left\" data-align=\"left\">Open an escape path; revise pattern or closure direction<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Edge starvation<\/td><td class=\"has-text-align-left\" data-align=\"left\">Too little volume, long flow path, lateral slide<\/td><td class=\"has-text-align-left\" data-align=\"left\">Bead dimensions and squeeze-out map<\/td><td class=\"has-text-align-left\" data-align=\"left\">Adjust volume, bead location, or alignment<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Random bubbles after cure<\/td><td class=\"has-text-align-left\" data-align=\"left\">Air in supply, poor mixing, or outgassing<\/td><td class=\"has-text-align-left\" data-align=\"left\">Purged sample, ratio record, cured cup sample<\/td><td class=\"has-text-align-left\" data-align=\"left\">Fix loading, meter\/mixer, pause rule, or cure condition<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Missing material at starts or stops<\/td><td class=\"has-text-align-left\" data-align=\"left\">Poor trigger timing, suck-back, stringing<\/td><td class=\"has-text-align-left\" data-align=\"left\">Robot trace and close-up vision<\/td><td class=\"has-text-align-left\" data-align=\"left\">Tune lead-in, lead-out, tip height, and dispense command<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">One low component has no contact<\/td><td class=\"has-text-align-left\" data-align=\"left\">Height tolerance or misplaced deposit<\/td><td class=\"has-text-align-left\" data-align=\"left\">Height map and transfer print<\/td><td class=\"has-text-align-left\" data-align=\"left\">Zone the pattern or select a more conformable grade<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Voids grow after thermal cycling<\/td><td class=\"has-text-align-left\" data-align=\"left\">Pump-out, slump, expansion mismatch<\/td><td class=\"has-text-align-left\" data-align=\"left\">Before\/after scan and thermal history<\/td><td class=\"has-text-align-left\" data-align=\"left\">Review rheology, gap, retention, and cycling requirement<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Heavy edge squeeze-out but poor center contact<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u0110\u1ed9 cong v\u00eanh c\u1ee7a v\u1ecf, ch\u1eb7n c\u1ee9ng, v\u1eadt c\u1ea3n \u1edf gi\u1eefa<\/td><td class=\"has-text-align-left\" data-align=\"left\">Qu\u00e9t \u0111\u1ed9 ph\u1eb3ng v\u00e0 \u0111o khe h\u1edf cu\u1ed1i c\u00f9ng<\/td><td class=\"has-text-align-left\" data-align=\"left\">Kh\u1eafc ph\u1ee5c v\u1ea5n \u0111\u1ec1 c\u01a1 kh\u00ed tr\u01b0\u1edbc khi b\u1ed5 sung v\u1eadt li\u1ec7u<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ea3ng n\u00e0y ch\u1ec9 l\u00e0 \u0111i\u1ec3m kh\u1edfi \u0111\u1ea7u, kh\u00f4ng ph\u1ea3i k\u1ebft lu\u1eadn cu\u1ed1i c\u00f9ng. H\u00e3y thay \u0111\u1ed5i t\u1eebng bi\u1ebfn s\u1ed1 \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t m\u1ed9t l\u1ea7n. N\u1ebfu ki\u1ec3u m\u1eabu, \u00e1p su\u1ea5t, v\u1eadt li\u1ec7u v\u00e0 m\u00f4-men xo\u1eafn \u0111\u1ec1u thay \u0111\u1ed5i c\u00f9ng l\u00fac, m\u1ed9t k\u1ebft qu\u1ea3 t\u1ed1t h\u1ea7u nh\u01b0 kh\u00f4ng cho b\u1ea1n bi\u1ebft \u0111i\u1ec1u g\u00ec.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"506\" src=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-69.png\" alt=\"C\u00e1ch tr\u00e1nh kho\u1ea3ng r\u1ed7ng trong keo t\u1ea3n nhi\u1ec7t d\u1ea1ng putty\" class=\"wp-image-2211\" srcset=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-69.png 900w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-69-18x10.png 18w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-69-300x169.png 300w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-69-767x431.png 767w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-69-599x337.png 599w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u1ee8ng d\u1ee5ng kh\u00e1c nhau, \u01b0u ti\u00ean kh\u00e1c nhau<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For a GPU or laptop cooler, watch direct-die contact, tilt, and VRAM\/VRM height. Telecom radios and servers add vertical orientation and repeated power cycling. EV batteries and inverters bring large areas, dielectric concerns, vibration, and traceability. LED and industrial products often bring cast-housing flatness and outdoor temperature swings. The root principles travel; the process window does not.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Standards and Test Methods: What They Prove<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The current active edition, ASTM D5470-17(2024), measures steady-state thermal impedance under controlled conditions. Its material categories include viscous liquids such as grease and paste, plus viscoelastic solids such as gels. That makes <a href=\"https:\/\/store.astm.org\/d5470-17r24.html\" target=\"_blank\" rel=\"noopener\">ASTM D5470<\/a> useful for material characterization, but it is not a universal void-acceptance rule for a finished GPU, battery pack, or telecom enclosure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 60068 environmental methods can support temperature, damp-heat, vibration, and related reliability plans when the relevant parts fit the product. IPC workmanship or quality frameworks may also apply through a customer specification. For a broader overview, see these <a href=\"https:\/\/haktak.com\/vi\/common-tim-testing-standards-engineers-should-know\/\">c\u00e1c ti\u00eau chu\u1ea9n ki\u1ec3m tra TIM ph\u1ed5 bi\u1ebfn<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The drawing, work instruction, supplier TDS and SDS, and device-level requirement still do the daily work. Define:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maximum void area and individual void size<\/li>\n\n\n\n<li>Critical no-void zones over hot components<\/li>\n\n\n\n<li>Required coverage and squeeze-out limits<\/li>\n\n\n\n<li>Final gap or interface thickness<\/li>\n\n\n\n<li>Thermal performance at beginning and end of life<\/li>\n\n\n\n<li>Inspection method, sampling rate, and reaction plan<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Kh\u00f4ng c\u00f3 c\u00e2u tr\u1ea3 l\u1eddi ph\u1ed5 qu\u00e1t n\u00e0o ho\u00e0n to\u00e0n ch\u00ednh x\u00e1c, ch\u1eb3ng h\u1ea1n nh\u01b0 \u201c5% lu\u00f4n an to\u00e0n.\u201d V\u1ecb tr\u00ed, m\u1eadt \u0111\u1ed9 d\u00f2ng nhi\u1ec7t, h\u00ecnh h\u1ecdc, c\u00e1ch ly \u0111i\u1ec7n \u00e1p v\u00e0 h\u1eadu qu\u1ea3 khi x\u1ea3y ra s\u1ef1 c\u1ed1 \u0111\u1ec1u \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn quy\u1ebft \u0111\u1ecbnh.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"506\" src=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-70.png\" alt=\"C\u00e1ch tr\u00e1nh kho\u1ea3ng r\u1ed7ng trong keo t\u1ea3n nhi\u1ec7t d\u1ea1ng putty\" class=\"wp-image-2212\" srcset=\"https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-70.png 900w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-70-18x10.png 18w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-70-300x169.png 300w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-70-767x431.png 767w, https:\/\/haktak.com\/wp-content\/uploads\/2026\/09\/image-70-599x337.png 599w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What to Send Your Material or Dispensing Supplier<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If voids keep returning, send more than one blurry photo. Include the interface drawing, height map, gap range, keep-out zones, bead pattern, cycle time, and closure direction. Add the material lot, storage, conditioning, pump, hose, nozzle, pressure, speed, mixer, purge method, screw sequence, inspection result, and thermal target.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That package gives a supplier something solid to work with. Haktak can use the same inputs for <a href=\"https:\/\/haktak.com\/vi\/material-selection-testing\/\">h\u1ed7 tr\u1ee3 l\u1ef1a ch\u1ecdn v\u00e0 th\u1eed nghi\u1ec7m v\u1eadt li\u1ec7u<\/a> when a standard grade or current process does not fit the real tolerance stack.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">K\u1ebft lu\u1eadn<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Avoiding voids in thermal putty is not about finding one clever dispense pattern or adding a larger blob. It is a system problem.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Start with stable material and clean surfaces. Give air an open route. Control bead geometry, closure, gap, and screw sequence. A camera can approve the bead; post-assembly evidence shows how the interface ended up.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That approach may feel less exciting than changing a robot path in five minutes. It is also far more likely to keep the hot spot from coming back.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What causes voids in thermal putty?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Common causes include air in the material supply, an unsuitable dispense pattern, insufficient or excessive volume, unstable bead geometry, surface contamination, assembly tilt, lateral sliding, and poor control of two-part mixing or cure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Do air bubbles reduce thermal putty performance?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">They can. Air interrupts the intended conductive path and may increase interface resistance. The effect depends on bubble size, depth, location, heat flux, and the rest of the cooling design.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is the best application pattern for thermal putty?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">There is no universal best pattern. A dot or short line may suit a small flat interface. Long areas may need an open serpentine or spaced beads. Validate the pattern across real gap and flatness tolerances.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Should thermal putty be spread by hand before assembly?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Only if the supplier and work instruction allow it. Manual spreading may introduce contamination, uneven thickness, or trapped folds. A controlled deposit followed by repeatable compression is usually easier to monitor.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can applying more thermal putty remove air gaps?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Sometimes underfill needs correction, but extra material is not a general void fix. Overfill can raise force, create squeeze-out, contaminate nearby parts, and distort the final interface.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Should one-part thermal putty be vacuum degassed?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Not unless the material supplier specifically approves the method. Packaged one-part putty may already be processed to limit air. Uncontrolled degassing can change composition, rheology, or handling.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How are hidden voids detected after a heat sink is installed?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Options include destructive transfer builds, X-ray or CT where contrast allows, suitable acoustic methods, and device-level thermal testing. The best choice depends on material, geometry, risk, and production volume.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Are voids more common in two-part thermal gap fillers?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Not necessarily, but two-part materials have extra failure paths. Ratio error, poor mixing, expired pot life, air during pail changes, and cure outgassing must be controlled along with placement and closure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can voided thermal putty be topped up or reworked?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Do not simply top up by default. Remove and replace the deposit when the material, contamination risk, or work instruction requires it. If rework is allowed, define cleaning, refill volume, inspection, and retest steps.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What void percentage is acceptable in a thermal interface?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">There is no universal percentage. The product team should set limits for total area, individual size, location over critical heat sources, thermal performance, electrical risk, and end-of-life reliability.<\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Applying thermal putty is a little like packing a suitcase. If air has nowhere to go, pushing harder on the [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":2208,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2202","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-haktak-blog"],"_links":{"self":[{"href":"https:\/\/haktak.com\/vi\/wp-json\/wp\/v2\/posts\/2202","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/haktak.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/haktak.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/haktak.com\/vi\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/haktak.com\/vi\/wp-json\/wp\/v2\/comments?post=2202"}],"version-history":[{"count":2,"href":"https:\/\/haktak.com\/vi\/wp-json\/wp\/v2\/posts\/2202\/revisions"}],"predecessor-version":[{"id":2213,"href":"https:\/\/haktak.com\/vi\/wp-json\/wp\/v2\/posts\/2202\/revisions\/2213"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/haktak.com\/vi\/wp-json\/wp\/v2\/media\/2208"}],"wp:attachment":[{"href":"https:\/\/haktak.com\/vi\/wp-json\/wp\/v2\/media?parent=2202"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/haktak.com\/vi\/wp-json\/wp\/v2\/categories?post=2202"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/haktak.com\/vi\/wp-json\/wp\/v2\/tags?post=2202"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}