{"id":16381,"date":"2026-03-13T11:08:35","date_gmt":"2026-03-13T11:08:35","guid":{"rendered":"http:\/\/quartz-grinding.com\/?p=16381"},"modified":"2026-03-13T11:08:40","modified_gmt":"2026-03-13T11:08:40","slug":"silica-filler-particle-size-control-for-emc-and-pcb-what-the-specification-numbers-actually-mean-and-why-they-matter","status":"publish","type":"post","link":"https:\/\/www.quartz-grinding.com\/vi\/silica-filler-particle-size-control-for-emc-and-pcb-what-the-specification-numbers-actually-mean-and-why-they-matter\/","title":{"rendered":"Ki\u1ec3m so\u00e1t k\u00edch th\u01b0\u1edbc h\u1ea1t silica cho v\u1eadt li\u1ec7u \u0111\u1ed9n EMC v\u00e0 PCB: \u00dd ngh\u0129a th\u1ef1c s\u1ef1 c\u1ee7a c\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 t\u1ea7m quan tr\u1ecdng c\u1ee7a ch\u00fang."},"content":{"rendered":"<p>Khi m\u1ed9t k\u1ef9 s\u01b0 \u0111\u00f3ng g\u00f3i b\u00e1n d\u1eabn ch\u1ec9 \u0111\u1ecbnh gi\u00e1 tr\u1ecb D50 l\u00e0 5 micron v\u00e0 D98 d\u01b0\u1edbi 15 micron cho ch\u1ea5t \u0111\u1ed9n silica EMC c\u1ee7a h\u1ecd, h\u1ecd kh\u00f4ng h\u1ec1 th\u1eadn tr\u1ecdng. Nh\u1eefng con s\u1ed1 \u0111\u00f3 ch\u00ednh x\u00e1c l\u00e0 ng\u01b0\u1ee1ng ph\u00e2n bi\u1ec7t gi\u1eefa m\u1ed9t h\u1ee3p ch\u1ea5t \u0111\u00fac c\u00f3 th\u1ec3 ch\u1ea3y \u1ed5n \u0111\u1ecbnh v\u00e0o c\u00e1c khoang c\u00f3 b\u01b0\u1edbc pitch nh\u1ecf v\u00e0 m\u1ed9t h\u1ee3p ch\u1ea5t g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng thi\u1ebfu h\u1ee5t, qu\u00e9t d\u00e2y v\u00e0 l\u1ed7i trong th\u1ef1c t\u1ebf. \u0110i\u1ec1u t\u01b0\u01a1ng t\u1ef1 c\u0169ng \u00e1p d\u1ee5ng cho c\u00e1c t\u1ea5m PCB: m\u1ed9t h\u1ea1t silica qu\u00e1 kh\u1ed5 duy nh\u1ea5t c\u00f3 th\u1ec3 t\u1ea1o ra m\u1ed9t kho\u1ea3ng tr\u1ed1ng t\u1ea1i giao di\u1ec7n gi\u1eefa nh\u1ef1a v\u00e0 ch\u1ea5t \u0111\u1ed9n, l\u00e0m gi\u00e1n \u0111o\u1ea1n t\u00ednh to\u00e0n v\u1eb9n t\u00edn hi\u1ec7u trong \u1ee9ng d\u1ee5ng 5G ho\u1ea1t \u0111\u1ed9ng \u1edf t\u1ea7n s\u1ed1 28 GHz.<\/p>\n\n\n\n<p>Ki\u1ec3m so\u00e1t ch\u1eb7t ch\u1ebd k\u00edch th\u01b0\u1edbc h\u1ea1t trong ch\u1ea5t \u0111\u1ed9n silica nung ch\u1ea3y kh\u00f4ng ch\u1ec9 l\u00e0 chi ti\u1ebft \u0111\u1ea3m b\u1ea3o ch\u1ea5t l\u01b0\u1ee3ng m\u00e0 c\u00f2n l\u00e0 y\u00eau c\u1ea7u ch\u1ee9c n\u0103ng. B\u00e0i vi\u1ebft n\u00e0y gi\u1ea3i th\u00edch ba ch\u1ebf \u0111\u1ed9 l\u1ed7i c\u1ee5 th\u1ec3 do ki\u1ec3m so\u00e1t ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t (PSD) k\u00e9m g\u00e2y ra, c\u00e1ch \u0111\u1ecdc v\u00e0 x\u00e1c \u0111\u1ecbnh PSD ch\u1ea5t \u0111\u1ed9n silica m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c, v\u00e0 c\u00e1c b\u01b0\u1edbc x\u1eed l\u00fd t\u1ea1o n\u00ean s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa ph\u00e2n b\u1ed1 r\u1ed9ng v\u00e0 ph\u00e2n b\u1ed1 ch\u1eb7t.<br>T\u1ea1i EPIC Powder Machinery, ch\u00fang t\u00f4i cung c\u1ea5p b\u1ed9t silica nung ch\u1ea3y v\u00e0 b\u1ed9t th\u1ea1ch anh c\u1ea5p \u0111i\u1ec7n t\u1eed cho c\u00e1c \u1ee9ng d\u1ee5ng EMC v\u00e0 PCB, v\u1edbi h\u1ec7 th\u1ed1ng gi\u00e1m s\u00e1t nhi\u1ec5u x\u1ea1 laser th\u1eddi gian th\u1ef1c trong m\u1ed7i l\u1ea7n s\u1ea3n xu\u1ea5t v\u00e0 Gi\u1ea5y ch\u1ee9ng nh\u1eadn ph\u00e2n t\u00edch \u0111\u1ea7y \u0111\u1ee7 k\u00e8m theo m\u1ed7i l\u00f4 h\u00e0ng.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1000\" height=\"612\" src=\"http:\/\/quartz-grinding.com\/wp-content\/uploads\/2024\/12\/Silicon-dioxide.png\" alt=\"Silic dioxide\" class=\"wp-image-16032\" srcset=\"https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/12\/Silicon-dioxide.png 1000w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/12\/Silicon-dioxide-300x184.png 300w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/12\/Silicon-dioxide-768x470.png 768w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/12\/Silicon-dioxide-18x12.png 18w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/12\/Silicon-dioxide-600x367.png 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><figcaption class=\"wp-element-caption\">Silic dioxide<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u00dd ngh\u0129a th\u1ef1c s\u1ef1 c\u1ee7a &quot;Ki\u1ec3m so\u00e1t k\u00edch th\u01b0\u1edbc h\u1ea1t ch\u1eb7t ch\u1ebd&quot; trong th\u1ef1c t\u1ebf l\u00e0 g\u00ec?<\/h2>\n\n\n\n<p>Ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t (PSD) c\u1ee7a ch\u1ea5t \u0111\u1ed9n silica \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi \u00edt nh\u1ea5t ba con s\u1ed1: D50 (k\u00edch th\u01b0\u1edbc trung b\u00ecnh), D90 ho\u1eb7c D98 (ph\u1ea7n th\u00f4 c\u1ee7a ph\u00e2n b\u1ed1) v\u00e0 \u0111\u00f4i khi l\u00e0 D10 (ph\u1ea7n m\u1ecbn). M\u1ed7i con s\u1ed1 ki\u1ec3m so\u00e1t m\u1ed9t kh\u00eda c\u1ea1nh kh\u00e1c nhau trong h\u00e0nh vi c\u1ee7a c\u00f4ng th\u1ee9c.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Th\u00f4ng s\u1ed1 PSD<\/strong><\/td><td><strong>N\u00f3 \u0111o l\u01b0\u1eddng \u0111i\u1ec1u g\u00ec?<\/strong><\/td><td><strong>Ch\u1ee9c n\u0103ng ki\u1ec3m so\u00e1t c\u1ee7a n\u00f3 trong EMC\/PCB<\/strong><\/td><td><strong>Ph\u1ea1m vi m\u1ee5c ti\u00eau \u0111i\u1ec3n h\u00ecnh<\/strong><\/td><\/tr><tr><td>D10<\/td><td>10% h\u1ea1t c\u00f3 k\u00edch th\u01b0\u1edbc nh\u1ecf h\u01a1n k\u00edch th\u01b0\u1edbc n\u00e0y.<\/td><td>K\u00edch th\u01b0\u1edbc h\u1ea1t \u0111\u1ed9n t\u1ed1i thi\u1ec3u \u2014 l\u01b0\u1ee3ng h\u1ea1t m\u1ecbn d\u01b0 th\u1eeba l\u00e0m t\u0103ng di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t v\u00e0 t\u0103ng \u0111\u1ed9 nh\u1edbt.<\/td><td>0,5 \u2013 2 micromet (t\u00f9y thu\u1ed9c v\u00e0o \u1ee9ng d\u1ee5ng)<\/td><\/tr><tr><td>D50<\/td><td>K\u00edch th\u01b0\u1edbc h\u1ea1t trung b\u00ecnh<\/td><td>M\u1eadt \u0111\u1ed9 \u0111\u00f3ng g\u00f3i v\u00e0 \u0111\u1ed9 nh\u1edbt c\u01a1 b\u1ea3n<\/td><td>3 \u2013 10 micron cho EMC ti\u00eau chu\u1ea9n; 1 \u2013 5 micron cho c\u00e1c lo\u1ea1i bao b\u00ec ti\u00ean ti\u1ebfn<\/td><\/tr><tr><td>D90<\/td><td>90% h\u1ea1t c\u00f3 k\u00edch th\u01b0\u1edbc nh\u1ecf h\u01a1n th\u1ebf n\u00e0y.<\/td><td>Ki\u1ec3m so\u00e1t ph\u00e2n \u0111o\u1ea1n th\u00f4 trung gian<\/td><td>15 \u2013 30 micron t\u00f9y thu\u1ed9c v\u00e0o h\u00ecnh d\u1ea1ng khu\u00f4n.<\/td><\/tr><tr><td>D98 \/ D99<\/td><td>98-99% h\u1ea1t nh\u1ecf h\u01a1n th\u1ebf n\u00e0y<\/td><td>K\u00edch th\u01b0\u1edbc h\u1ea1t g\u1ea7n t\u1ed1i \u0111a \u2014 ki\u1ec3m so\u00e1t h\u1ea1t g\u00e2y ch\u1ebft ng\u01b0\u1eddi<\/td><td>K\u00edch th\u01b0\u1edbc ti\u00eau chu\u1ea9n d\u01b0\u1edbi 20 micron; d\u01b0\u1edbi 10 micron \u0111\u1ed1i v\u1edbi c\u00e1c lo\u1ea1i bao b\u00ec cao c\u1ea5p.<\/td><\/tr><tr><td>Dmax \/ D100<\/td><td>K\u00edch th\u01b0\u1edbc h\u1ea1t t\u1ed1i \u0111a tuy\u1ec7t \u0111\u1ed1i hi\u1ec7n c\u00f3<\/td><td>Gi\u1edbi h\u1ea1n c\u1ee9ng \u2014 kh\u00f4ng c\u00f3 h\u1ea1t n\u00e0o v\u01b0\u1ee3t qu\u00e1 gi\u00e1 tr\u1ecb n\u00e0y.<\/td><td>D\u01b0\u1edbi 45 micron ti\u00eau chu\u1ea9n; d\u01b0\u1edbi 25 micron b\u01b0\u1edbc s\u00f3ng nh\u1ecf; d\u01b0\u1edbi 15 micron si\u00eau nh\u1ecf<\/td><\/tr><tr><td>Kho\u1ea3ng c\u00e1ch = (D90-D10)\/D50<\/td><td>\u0110\u1ed9 r\u1ed9ng c\u1ee7a ph\u00e2n b\u1ed1<\/td><td>T\u00ednh \u0111\u1ed3ng nh\u1ea5t c\u1ee7a ph\u00e2n b\u1ed1 \u2014 ph\u1ea1m vi nh\u1ecf h\u01a1n = ph\u00e2n b\u1ed1 ch\u1eb7t ch\u1ebd h\u01a1n<\/td><td>D\u01b0\u1edbi 2.0 \u0111\u1ed1i v\u1edbi EMC ti\u00eau chu\u1ea9n; d\u01b0\u1edbi 1.2 \u0111\u1ed1i v\u1edbi bao b\u00ec m\u1eadt \u0111\u1ed9 cao<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Th\u00f4ng s\u1ed1 th\u01b0\u1eddng b\u1ecb x\u00e1c \u0111\u1ecbnh sai nh\u1ea5t l\u00e0 Dmax \u2014 k\u00edch th\u01b0\u1edbc h\u1ea1t t\u1ed1i \u0111a tuy\u1ec7t \u0111\u1ed1i. D90 v\u00e0 D98 l\u00e0 c\u00e1c s\u1ed1 \u0111o th\u1ed1ng k\u00ea; ch\u00fang cho bi\u1ebft v\u1ec1 90% ho\u1eb7c 98% h\u1ea1t, nh\u01b0ng kh\u00f4ng n\u00f3i l\u00ean \u0111i\u1ec1u g\u00ec v\u1ec1 2% h\u1ea1t c\u00f2n l\u1ea1i c\u00f3 k\u00edch th\u01b0\u1edbc l\u1edbn h\u01a1n. \u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng EMC v\u00e0 PCB, 2% h\u1ea1t n\u00e0y ch\u00ednh l\u00e0 n\u01a1i ph\u00e1t sinh l\u1ed7i. Ch\u1ea5t \u0111\u1ed9n silica v\u1edbi D98 = 18 micron v\u1eabn c\u00f3 th\u1ec3 ch\u1ee9a c\u00e1c h\u1ea1t c\u00f3 k\u00edch th\u01b0\u1edbc t\u1eeb 50-80 micron n\u1ebfu Dmax kh\u00f4ng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh v\u00e0 ki\u1ec3m so\u00e1t ri\u00eang bi\u1ec7t. Vi\u1ec7c x\u00e1c \u0111\u1ecbnh D98 v\u00e0 Dmax l\u00e0 c\u00e1c con s\u1ed1 ri\u00eang bi\u1ec7t s\u1ebd kh\u1eafc ph\u1ee5c \u0111\u01b0\u1ee3c v\u1ea5n \u0111\u1ec1 n\u00e0y.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ba ki\u1ec3u l\u1ed7i do ki\u1ec3m so\u00e1t PSD k\u00e9m g\u00e2y ra<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Hi\u1ec7n t\u01b0\u1ee3ng t\u0103ng \u0111\u1ed9t bi\u1ebfn \u0111\u1ed9 nh\u1edbt v\u00e0 thi\u1ebfu h\u1ee5t nguy\u00ean li\u1ec7u (v\u1ea5n \u0111\u1ec1 v\u1ec1 c\u1eb7n m\u1ecbn)<\/h3>\n\n\n\n<p>Khi ch\u1ea5t \u0111\u1ed9n silica c\u00f3 qu\u00e1 nhi\u1ec1u h\u1ea1t si\u00eau m\u1ecbn \u2014 D10 d\u01b0\u1edbi 0,3 micron, ho\u1eb7c c\u00f3 ph\u1ea7n \u0111u\u00f4i m\u1ecbn d\u00e0i trong ph\u00e2n b\u1ed1 \u2014 t\u1ed5ng di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t c\u1ee7a ch\u1ea5t \u0111\u1ed9n t\u0103ng l\u00ean \u0111\u00e1ng k\u1ec3. Nh\u1ef1a l\u00e0m \u01b0\u1edbt b\u1ec1 m\u1eb7t ch\u1ea5t \u0111\u1ed9n, v\u00ec v\u1eady di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t l\u1edbn h\u01a1n c\u00f3 ngh\u0129a l\u00e0 nhi\u1ec1u nh\u1ef1a h\u01a1n b\u1ecb ti\u00eau th\u1ee5 \u0111\u1ec3 gi\u1eef cho c\u00e1c h\u1ea1t l\u01a1 l\u1eedng v\u00e0 \u0111\u01b0\u1ee3c b\u00f4i tr\u01a1n. K\u1ebft qu\u1ea3 l\u00e0 \u0111\u1ed9 nh\u1edbt t\u0103ng l\u00ean, c\u00f3 th\u1ec3 r\u1ea5t nghi\u00eam tr\u1ecdng: s\u1ef1 thay \u0111\u1ed5i t\u1eeb D10 l\u00e0 1 micron sang D10 l\u00e0 0,3 micron \u1edf c\u00f9ng m\u1ed9t h\u00e0m l\u01b0\u1ee3ng c\u00f3 th\u1ec3 l\u00e0m t\u0103ng \u0111\u1ed9 nh\u1edbt c\u1ee7a h\u1ee3p ch\u1ea5t EMC l\u00ean 40-60%.<\/p>\n\n\n\n<p>\u1ede nhi\u1ec7t \u0111\u1ed9 \u00e9p chuy\u1ec3n ti\u00eau chu\u1ea9n, \u0111\u1ed9 nh\u1edbt cao h\u01a1n n\u00e0y c\u00f3 ngh\u0129a l\u00e0 h\u1ee3p ch\u1ea5t kh\u00f4ng th\u1ec3 th\u1ea5m ho\u00e0n to\u00e0n v\u00e0o c\u00e1c khoang khu\u00f4n c\u00f3 b\u01b0\u1edbc r\u0103ng nh\u1ecf tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u \u0111\u00f4ng \u0111\u1eb7c. K\u1ebft qu\u1ea3 l\u00e0 s\u1ea3n ph\u1ea9m kh\u00f4ng \u0111\u01b0\u1ee3c \u0111i\u1ec1n \u0111\u1ea7y \u0111\u1ee7 \u2014 thi\u1ebfu h\u1ee5t \u2014 v\u1edbi c\u00e1c l\u1ed7 r\u1ed7ng trong bao b\u00ec th\u00e0nh ph\u1ea9m. T\u1ef7 l\u1ec7 thi\u1ebfu h\u1ee5t c\u1ee7a 5-15% th\u01b0\u1eddng g\u1eb7p trong c\u00e1c d\u00e2y chuy\u1ec1n EMC ch\u01b0a ki\u1ec3m so\u00e1t \u0111\u01b0\u1ee3c ph\u1ea7n \u0111u\u00f4i nh\u1ecf c\u1ee7a ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t silica (PSD).<\/p>\n\n\n\n<p>Gi\u1ea3i ph\u00e1p l\u00e0 ki\u1ec3m so\u00e1t D10 v\u00e0 \u0111\u1eb7t gi\u1edbi h\u1ea1n tr\u00ean cho ph\u1ea7n h\u1ea1t m\u1ecbn (t\u1ef7 l\u1ec7 ph\u1ea7n tr\u0103m v\u1eadt li\u1ec7u d\u01b0\u1edbi 1 micron). \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi ho\u1eb7c m\u1ed9t quy tr\u00ecnh ph\u00e2n lo\u1ea1i nhi\u1ec1u giai \u0111o\u1ea1n \u0111\u1ec3 lo\u1ea1i b\u1ecf c\u00e1c h\u1ea1t si\u00eau m\u1ecbn kh\u1ecfi s\u1ea3n ph\u1ea9m, ho\u1eb7c m\u1ed9t quy tr\u00ecnh nghi\u1ec1n \u0111\u1ec3 tr\u00e1nh t\u1ea1o ra ch\u00fang ngay t\u1eeb \u0111\u1ea7u.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Hi\u1ec7n t\u01b0\u1ee3ng qu\u00e9t d\u00e2y v\u00e0 t\u00e1ch l\u1edbp (V\u1ea5n \u0111\u1ec1 h\u1ea1t th\u00f4)<\/h3>\n\n\n\n<p>\u1ede m\u1ee9c \u0111\u1ed9 th\u00f4, c\u00e1c h\u1ea1t qu\u00e1 kh\u1ed5 g\u00e2y ra hai ch\u1ebf \u0111\u1ed9 h\u1ecfng h\u00f3c kh\u00e1c nhau. \u0110\u1ea7u ti\u00ean l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng cu\u1ed1n d\u00e2y: trong qu\u00e1 tr\u00ecnh \u00e9p chuy\u1ec3n, h\u1ee3p ch\u1ea5t EMC \u0111ang ch\u1ea3y t\u1ea1o ra l\u1ef1c th\u1ee7y l\u1ef1c l\u00ean c\u00e1c m\u1ed1i n\u1ed1i d\u00e2y m\u1ea3nh n\u1ed1i chip v\u1edbi ch\u1ea5t n\u1ec1n c\u1ee7a bao b\u00ec. M\u1ed9t h\u1ea1t silica l\u1edbn, c\u1ee9ng (v\u00ed d\u1ee5, 80 micron trong h\u1ee3p ch\u1ea5t \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh cho D90 = 30 micron) c\u00f3 th\u1ec3 l\u00e0m l\u1ec7ch h\u01b0\u1edbng v\u1eadt l\u00fd m\u1ed9t m\u1ed1i n\u1ed1i d\u00e2y v\u00e0ng 20 micron khi h\u1ee3p ch\u1ea5t ch\u1ea3y qua. Hi\u1ec7n t\u01b0\u1ee3ng cu\u1ed1n d\u00e2y v\u01b0\u1ee3t qu\u00e1 5-10% \u0111\u01b0\u1eddng k\u00ednh d\u00e2y l\u00e0 m\u1ed9t l\u1ed7i \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 tin c\u1eady.<\/p>\n\n\n\n<p>L\u1ed7i th\u1ee9 hai l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng t\u00e1ch l\u1edbp. C\u00e1c h\u1ea1t l\u1edbn t\u1eadp trung \u1ee9ng su\u1ea5t trong v\u1eadt li\u1ec7u composite \u0111\u00e3 \u0111\u01b0\u1ee3c x\u1eed l\u00fd \u2013 khi bao b\u00ec tr\u1ea3i qua chu k\u1ef3 nhi\u1ec7t (t\u1eeb -55 \u0111\u1ebfn +125 \u0111\u1ed9 C trong qu\u00e1 tr\u00ecnh ki\u1ec3m \u0111\u1ecbnh ch\u1ea5t l\u01b0\u1ee3ng \u00f4 t\u00f4, ch\u1eb3ng h\u1ea1n), s\u1ef1 t\u1eadp trung \u1ee9ng su\u1ea5t xung quanh c\u00e1c h\u1ea1t l\u1edbn v\u01b0\u1ee3t qu\u00e1 \u0111\u1ed9 b\u1ec1n b\u00e1m d\u00ednh c\u1ee7a giao di\u1ec7n nh\u1ef1a-ch\u1ea5t \u0111\u1ed9n. C\u00e1c v\u1ebft n\u1ee9t b\u1eaft \u0111\u1ea7u t\u1eeb nh\u1eefng h\u1ea1t n\u00e0y v\u00e0 lan r\u1ed9ng, cu\u1ed1i c\u00f9ng g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng t\u00e1ch l\u1edbp gi\u1eefa EMC v\u00e0 l\u1edbp g\u1eafn chip ho\u1eb7c ch\u1ea5t n\u1ec1n.<\/p>\n\n\n\n<p>C\u1ea3 hai l\u1ed7i \u0111\u1ec1u \u0111\u01b0\u1ee3c ng\u0103n ng\u1eeba b\u1eb1ng c\u00e1ch ki\u1ec3m so\u00e1t Dmax ch\u1eb7t ch\u1ebd \u2014 ch\u1ee9 kh\u00f4ng ch\u1ec9 D90 ho\u1eb7c D98. M\u1ed9t s\u00e0ng rung v\u1edbi k\u00edch th\u01b0\u1edbc l\u1ed7 ph\u00f9 h\u1ee3p c\u1ed9ng v\u1edbi b\u01b0\u1edbc ph\u00e2n lo\u1ea1i b\u1eb1ng kh\u00ed \u1edf ph\u00eda sau gi\u00fap lo\u1ea1i b\u1ecf b\u1ea5t k\u1ef3 v\u1eadt li\u1ec7u n\u00e0o v\u01b0\u1ee3t qu\u00e1 Dmax m\u1ee5c ti\u00eau s\u1ebd cung c\u1ea5p gi\u1edbi h\u1ea1n tr\u00ean c\u1ee9ng c\u1ea7n thi\u1ebft.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. S\u1ef1 kh\u00f4ng ph\u00f9 h\u1ee3p h\u1ec7 s\u1ed1 gi\u00e3n n\u1edf nhi\u1ec7t (CTE) v\u00e0 s\u1ef1 cong v\u00eanh c\u1ee7a m\u1ea1ch in (V\u1ea5n \u0111\u1ec1 v\u1ec1 t\u00ednh \u0111\u1ed3ng nh\u1ea5t)<\/h3>\n\n\n\n<p>Silicon c\u00f3 h\u1ec7 s\u1ed1 gi\u00e3n n\u1edf nhi\u1ec7t (CTE) x\u1ea5p x\u1ec9 3 ppm\/\u0111\u1ed9 C. V\u1eadt li\u1ec7u n\u1ec1n PCB epoxy th\u1ee7y tinh FR-4 c\u00f3 CTE kho\u1ea3ng 14-17 ppm\/\u0111\u1ed9 C. M\u1ee5c \u0111\u00edch c\u1ee7a ch\u1ea5t \u0111\u1ed9n silica trong l\u1edbp m\u00e0ng PCB l\u00e0 \u0111\u1ec3 thu h\u1eb9p kho\u1ea3ng c\u00e1ch n\u00e0y \u2014 ch\u1ea5t \u0111\u1ed9n l\u00e0m gi\u1ea3m CTE c\u1ee7a v\u1eadt li\u1ec7u composite v\u1ec1 ph\u00eda gi\u00e1 tr\u1ecb c\u1ee7a silicon, gi\u1ea3m \u1ee9ng su\u1ea5t l\u00ean c\u00e1c m\u1ed1i h\u00e0n trong qu\u00e1 tr\u00ecnh chu k\u1ef3 nhi\u1ec7t.<\/p>\n\n\n\n<p>S\u1ef1 gi\u1ea3m h\u1ec7 s\u1ed1 gi\u00e3n n\u1edf nhi\u1ec7t (CTE) n\u00e0y t\u1ef7 l\u1ec7 thu\u1eadn v\u1edbi l\u01b0\u1ee3ng ch\u1ea5t \u0111\u1ed9n. L\u01b0\u1ee3ng ch\u1ea5t \u0111\u1ed9n c\u00e0ng cao = CTE c\u1ee7a v\u1eadt li\u1ec7u composite c\u00e0ng th\u1ea5p = CTE ph\u00f9 h\u1ee3p h\u01a1n v\u1edbi silicon = tu\u1ed5i th\u1ecd m\u1ed1i h\u00e0n c\u00e0ng d\u00e0i. Nh\u01b0ng l\u01b0\u1ee3ng ch\u1ea5t \u0111\u1ed9n cao ch\u1ec9 hi\u1ec7u qu\u1ea3 n\u1ebfu ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t (PSD) cho ph\u00e9p. M\u1ed9t PSD r\u1ed9ng v\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t t\u1ed1t s\u1ebd t\u1ea1o ra s\u1ef1 s\u1eafp x\u1ebfp h\u1ea1t kh\u00f4ng hi\u1ec7u qu\u1ea3 \u2014 c\u00e1c h\u1ea1t l\u1edbn h\u01a1n t\u1ea1o ra c\u00e1c kho\u1ea3ng tr\u1ed1ng m\u00e0 c\u00e1c h\u1ea1t nh\u1ecf h\u01a1n kh\u00f4ng th\u1ec3 l\u1ea5p \u0111\u1ea7y v\u00ec t\u1ef7 l\u1ec7 k\u00edch th\u01b0\u1edbc kh\u00f4ng ph\u00f9 h\u1ee3p. L\u01b0\u1ee3ng ch\u1ea5t \u0111\u1ed9n t\u1ed1i \u0111a c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c gi\u1ea3m t\u1eeb 85-90% (PSD l\u01b0\u1ee1ng c\u1ef1c ch\u1eb7t ch\u1ebd) xu\u1ed1ng 65-75% (PSD r\u1ed9ng v\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t), v\u1edbi s\u1ef1 suy gi\u1ea3m t\u01b0\u01a1ng \u1ee9ng v\u1ec1 kh\u1ea3 n\u0103ng gi\u1ea3m CTE.<\/p>\n\n\n\n<p>K\u1ebft qu\u1ea3 l\u00e0 l\u1edbp m\u00e0ng PCB c\u00f3 h\u1ec7 s\u1ed1 gi\u00e3n n\u1edf nhi\u1ec7t (CTE) cao h\u01a1n so v\u1edbi thi\u1ebft k\u1ebf, bi\u1ec3u hi\u1ec7n l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng cong v\u00eanh trong qu\u00e1 tr\u00ecnh h\u00e0n ch\u1ea3y l\u1ea1i (hi\u1ec7u \u1ee9ng &quot;b\u1ecfng ng\u00f4&quot; trong c\u00e1c g\u00f3i linh ki\u1ec7n, cong v\u00eanh bo m\u1ea1ch \u1edf c\u00e1c PCB tr\u1ea7n) v\u00e0 hi\u1ec7n t\u01b0\u1ee3ng m\u1ecfi m\u1ed1i h\u00e0n s\u1edbm trong qu\u00e1 tr\u00ecnh s\u1eed d\u1ee5ng th\u1ef1c t\u1ebf.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>B\u1ea3ng tham kh\u1ea3o th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt nhanh: Ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t silica theo \u1ee9ng d\u1ee5ng - Ti\u00eau chu\u1ea9n EMC (bao b\u00ec QFP, SOP): <\/strong><br>D50: 5-10 micron | D98: &lt;25 micron | Dmax: &lt;45 micron | T\u1ea3i tr\u1ecdng: 70-80%<br><strong>EMC b\u01b0\u1edbc pitch nh\u1ecf (BGA, chip l\u1eadt): <\/strong>D50: 3-6 micron | D98: &lt;15 micron | Dmax: &lt;25 micron | T\u1ea3i tr\u1ecdng: 75-85%<br><strong>EMC si\u00eau m\u1ecbn (bao b\u00ec c\u1ea5p \u0111\u1ed9 wafer ti\u00ean ti\u1ebfn): <\/strong>D50: 1-3 micron | D98: &lt;8 micron | Dmax: &lt;12 micron | T\u1ea3i tr\u1ecdng: l\u00ean \u0111\u1ebfn 90%<br><strong>V\u1eadt li\u1ec7u tr\u00e1m khe PCB (thay th\u1ebf ti\u00eau chu\u1ea9n FR-4): <\/strong>D50: 5-15 micron | D90: &lt;35 micron | Dmax: &lt;50 micron | T\u1ea3i tr\u1ecdng: 60-75%<br><strong>Ch\u1ea5t \u0111\u00f3ng g\u00f3i Glob top: <\/strong>D50: 3-8 micron | D98: &lt;20 micron | Kho\u1ea3ng ch\u00eanh l\u1ec7ch h\u1eb9p (&lt;1,5) r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh \u0111\u1ed9 nh\u1edbt<br><strong>Ghi ch\u00fa: <\/strong>Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u00f3 th\u1ec3 kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o thi\u1ebft k\u1ebf bao b\u00ec, kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c d\u00e2y d\u1eabn v\u00e0 h\u1ec7 th\u1ed1ng nh\u1ef1a. Vui l\u00f2ng x\u00e1c nh\u1eadn v\u1edbi nh\u00f3m chuy\u00ean gia pha ch\u1ebf c\u1ee7a b\u1ea1n.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t (PSD) ch\u1eb7t ch\u1ebd trong s\u1ea3n xu\u1ea5t silica nung ch\u1ea3y<\/h2>\n\n\n\n<p>Vi\u1ec7c \u0111\u1ea1t \u0111\u01b0\u1ee3c v\u00e0 duy tr\u00ec c\u00e1c ti\u00eau chu\u1ea9n PSD n\u00eau tr\u00ean \u0111\u00f2i h\u1ecfi s\u1ef1 ki\u1ec3m so\u00e1t \u1edf b\u1ed1n giai \u0111o\u1ea1n c\u1ee7a quy tr\u00ecnh s\u1ea3n xu\u1ea5t. M\u1ed7i giai \u0111o\u1ea1n b\u1ed5 sung th\u00eam m\u1ed9t l\u1edbp \u0111\u1ea3m b\u1ea3o; kh\u00f4ng m\u1ed9t giai \u0111o\u1ea1n n\u00e0o l\u00e0 \u0111\u1ee7 ri\u00eang l\u1ebb.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. Ki\u1ec3m so\u00e1t nguy\u00ean li\u1ec7u th\u00f4<\/strong><strong><\/strong><\/h3>\n\n\n\n<p>Ch\u1ea5t l\u01b0\u1ee3ng nguy\u00ean li\u1ec7u silica nung ch\u1ea3y quy\u1ebft \u0111\u1ecbnh nh\u1eefng g\u00ec c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c trong qu\u00e1 tr\u00ecnh x\u1eed l\u00fd ti\u1ebfp theo. M\u1eadt \u0111\u1ed9 nguy\u00ean li\u1ec7u th\u00f4 kh\u00f4ng nh\u1ea5t qu\u00e1n, h\u00e0m l\u01b0\u1ee3ng \u1ea9m ho\u1eb7c m\u1ee9c \u0111\u1ed9 t\u1ea1p ch\u1ea5t bu\u1ed9c thi\u1ebft b\u1ecb x\u1eed l\u00fd ph\u1ea3i ho\u1ea1t \u0111\u1ed9ng ngo\u00e0i c\u00e1c th\u00f4ng s\u1ed1 t\u1ed1i \u01b0u, l\u00e0m m\u1edf r\u1ed9ng ph\u1ea1m vi ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t (PSD) c\u1ee7a s\u1ea3n ph\u1ea9m \u0111\u1ea7u ra. T\u1ea5t c\u1ea3 nguy\u00ean li\u1ec7u silica nung ch\u1ea3y \u0111\u1ea7u v\u00e0o c\u1ea7n \u0111\u01b0\u1ee3c ki\u1ec3m tra \u0111\u1ed9 tinh khi\u1ebft c\u1ee7a SiO2 (m\u1ee5c ti\u00eau tr\u00ean 99,7% \u0111\u1ed1i v\u1edbi lo\u1ea1i d\u00f9ng trong ng\u00e0nh \u0111i\u1ec7n t\u1eed), m\u1eadt \u0111\u1ed9 kh\u1ed1i l\u01b0\u1ee3ng v\u00e0 PSD tr\u01b0\u1edbc khi nghi\u1ec1n tr\u01b0\u1edbc khi \u0111\u01b0a v\u00e0o quy tr\u00ecnh s\u1ea3n xu\u1ea5t.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. Gia c\u00f4ng phay ch\u00ednh x\u00e1c \u2014 M\u00e0i tu\u1ea7n ho\u00e0n k\u00edn<\/strong><strong><\/strong><\/h3>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi silica d\u00f9ng trong ng\u00e0nh \u0111i\u1ec7n t\u1eed, quy tr\u00ecnh nghi\u1ec1n kh\u00e9p k\u00edn l\u00e0 ti\u00eau chu\u1ea9n. M\u00e1y nghi\u1ec1n v\u00e0 m\u00e1y ph\u00e2n lo\u1ea1i ho\u1ea1t \u0111\u1ed9ng trong m\u1ed9t v\u00f2ng l\u1eb7p li\u00ean t\u1ee5c: m\u00e1y nghi\u1ec1n l\u00e0m gi\u1ea3m k\u00edch th\u01b0\u1edbc h\u1ea1t, m\u00e1y ph\u00e2n lo\u1ea1i ngay l\u1eadp t\u1ee9c ph\u00e2n lo\u1ea1i c\u00e1c h\u1ea1t th\u00e0nh h\u1ea1t m\u1ecbn (\u0111\u1ea1t ti\u00eau chu\u1ea9n, ra kh\u1ecfi v\u00f2ng tu\u1ea7n ho\u00e0n) v\u00e0 h\u1ea1t th\u00f4 (b\u1ecb lo\u1ea1i b\u1ecf, tr\u1ea3 l\u1ea1i m\u00e1y nghi\u1ec1n). \u0110i\u1ec1u n\u00e0y ng\u0103n ng\u1eeba vi\u1ec7c nghi\u1ec1n qu\u00e1 m\u1ee9c c\u00e1c h\u1ea1t \u0111\u00e3 m\u1ecbn v\u00e0 \u0111\u1ea3m b\u1ea3o r\u1eb1ng ch\u1ec9 c\u00f3 v\u1eadt li\u1ec7u \u0111\u00e1p \u1ee9ng ti\u00eau chu\u1ea9n k\u00edch th\u01b0\u1edbc m\u1edbi \u0111\u01b0\u1ee3c t\u00edch l\u0169y trong d\u00f2ng s\u1ea3n ph\u1ea9m.<\/p>\n\n\n\n<p>Ph\u01b0\u01a1ng ph\u00e1p nghi\u1ec1n b\u1eb1ng tia kh\u00ed th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c lo\u1ea1i \u0111\u00e1 m\u1ecbn nh\u1ea5t (D50 d\u01b0\u1edbi 5 micron) v\u00ec n\u00f3 cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng \u0111\u1ea7u v\u00e0o cao \u0111\u1ec3 gi\u1ea3m k\u00edch th\u01b0\u1edbc m\u00e0 kh\u00f4ng g\u00e2y \u00f4 nhi\u1ec5m kim lo\u1ea1i \u2014 nguy\u00ean l\u00fd nghi\u1ec1n b\u1eb1ng kh\u00ed n\u00e9n c\u00f3 ngh\u0129a l\u00e0 kh\u00f4ng c\u00f3 b\u1ec1 m\u1eb7t nghi\u1ec1n n\u00e0o ti\u1ebfp x\u00fac v\u1edbi s\u1ea3n ph\u1ea9m. \u0110\u1ed1i v\u1edbi c\u00e1c lo\u1ea1i \u0111\u00e1 th\u00f4 h\u01a1n (D50 5-15 micron), m\u00e1y nghi\u1ec1n bi ho\u1eb7c m\u00e1y nghi\u1ec1n tr\u1ee5c l\u0103n trong m\u1ea1ch k\u00edn v\u1edbi b\u1ed9 ph\u00e2n lo\u1ea1i kh\u00ed s\u1ebd ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng h\u01a1n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. Ph\u00e2n lo\u1ea1i kh\u00f4ng kh\u00ed nhi\u1ec1u giai \u0111o\u1ea1n<\/strong><strong><\/strong><\/h3>\n\n\n\n<p>M\u1ed9t giai \u0111o\u1ea1n ph\u00e2n lo\u1ea1i duy nh\u1ea5t t\u00e1ch c\u00e1c h\u1ea1t m\u1ecbn v\u00e0 th\u00f4 nh\u01b0ng t\u1ea1o ra v\u00f9ng chuy\u1ec3n ti\u1ebfp d\u1ea7n d\u1ea7n thay v\u00ec m\u1ed9t h\u00e0m b\u1eadc thang s\u1eafc n\u00e9t. \u0110\u1ed1i v\u1edbi silica c\u1ea5p \u0111i\u1ec7n t\u1eed, n\u01a1i Dmax ph\u1ea3i \u0111\u01b0\u1ee3c gi\u1edbi h\u1ea1n nghi\u00eam ng\u1eb7t, c\u1ea7n c\u00f3 ph\u00e2n lo\u1ea1i nhi\u1ec1u giai \u0111o\u1ea1n: b\u1ed9 ph\u00e2n lo\u1ea1i s\u01a1 c\u1ea5p thi\u1ebft l\u1eadp D50, v\u00e0 b\u1ed9 ph\u00e2n lo\u1ea1i th\u1ee9 c\u1ea5p nh\u1eafm m\u1ee5c ti\u00eau c\u1ee5 th\u1ec3 v\u00e0o ph\u1ea7n th\u00f4 \u1edf \u0111u\u00f4i \u2014 lo\u1ea1i b\u1ecf v\u1eadt li\u1ec7u v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng Dmax v\u1edbi hi\u1ec7u qu\u1ea3 cao.<\/p>\n\n\n\n<p>M\u00e1y ph\u00e2n lo\u1ea1i kh\u00ed n\u1eb1m ngang cho kh\u1ea3 n\u0103ng ph\u00e2n t\u00e1ch t\u1ed1t h\u01a1n so v\u1edbi thi\u1ebft k\u1ebf th\u1eb3ng \u0111\u1ee9ng v\u00ec qu\u1ef9 \u0111\u1ea1o chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a h\u1ea1t trong tr\u01b0\u1eddng d\u00f2ng ch\u1ea3y n\u1eb1m ngang \u00edt b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi s\u1ef1 l\u1eafng \u0111\u1ecdng do tr\u1ecdng l\u1ef1c c\u1ee7a c\u00e1c h\u1ea1t l\u1edbn h\u01a1n. \u0110\u1ed1i v\u1edbi ti\u00eau chu\u1ea9n D98 d\u01b0\u1edbi 15 micron \u2014 ph\u1ea1m vi c\u1ea7n thi\u1ebft cho EMC ti\u00ean ti\u1ebfn \u2014 h\u00ecnh d\u1ea1ng m\u00e1y ph\u00e2n lo\u1ea1i n\u1eb1m ngang l\u00e0 l\u1ef1a ch\u1ecdn ti\u00eau chu\u1ea9n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. Gi\u00e1m s\u00e1t nhi\u1ec5u x\u1ea1 laser theo th\u1eddi gian th\u1ef1c<\/strong><strong><\/strong><\/h3>\n\n\n\n<p>Th\u00f4ng s\u1ed1 PSD \u0111\u1ea7u ra ph\u1ea3i \u0111\u01b0\u1ee3c ki\u1ec3m tra li\u00ean t\u1ee5c trong su\u1ed1t qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t, kh\u00f4ng ch\u1ec9 khi b\u1eaft \u0111\u1ea7u m\u1ed9t m\u1ebb s\u1ea3n xu\u1ea5t. C\u00e1c c\u1ea3m bi\u1ebfn nhi\u1ec5u x\u1ea1 laser t\u00edch h\u1ee3p s\u1ebd \u0111o d\u00f2ng s\u1ea3n ph\u1ea9m m\u1ed7i 30-60 gi\u00e2y. N\u1ebfu D50 l\u1ec7ch qu\u00e1 5% so v\u1edbi m\u1ee5c ti\u00eau, ho\u1eb7c n\u1ebfu D98 cho th\u1ea5y xu h\u01b0\u1edbng t\u0103ng l\u00ean, h\u1ec7 th\u1ed1ng s\u1ebd c\u1ea3nh b\u00e1o ng\u01b0\u1eddi v\u1eadn h\u00e0nh \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh ngay l\u1eadp t\u1ee9c c\u00e1c th\u00f4ng s\u1ed1 c\u1ee7a b\u1ed9 ph\u00e2n lo\u1ea1i.<\/p>\n\n\n\n<p>Vi\u1ec7c gi\u00e1m s\u00e1t li\u00ean t\u1ee5c n\u00e0y l\u00e0 c\u00e1ch duy nh\u1ea5t \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u00fai \u0111\u1ea7u ti\u00ean v\u00e0 t\u00fai cu\u1ed1i c\u00f9ng c\u1ee7a m\u1ed9t l\u00f4 s\u1ea3n xu\u1ea5t c\u00f3 ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t (PSD) gi\u1ed1ng h\u1ec7t nhau. Vi\u1ec7c l\u1ea5y m\u1eabu cu\u1ed1i l\u00f4 \u2014 ki\u1ec3m tra m\u1ed9t m\u1eabu sau 4-8 gi\u1edd s\u1ea3n xu\u1ea5t \u2014 b\u1ecf s\u00f3t s\u1ef1 bi\u1ebfn \u0111\u1ed9ng trong c\u00f9ng m\u1ed9t l\u00f4, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 r\u1ea5t \u0111\u00e1ng k\u1ec3 trong c\u00e1c l\u00f4 s\u1ea3n xu\u1ea5t d\u00e0i.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\">S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa silica d\u1ea1ng g\u00f3c c\u1ea1nh v\u00e0 d\u1ea1ng h\u00ecnh c\u1ea7u d\u00f9ng l\u00e0m ch\u1ea5t \u0111\u1ed9n cho m\u1ea1ch in v\u00e0 t\u01b0\u01a1ng th\u00edch \u0111i\u1ec7n t\u1eeb (EMC) l\u00e0 g\u00ec?<\/h3>\n\n\n\n<p>S\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y n\u1eb1m \u1edf c\u01a1 s\u1edf c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a ch\u1ea5t \u0111\u1ed9n trong h\u1ec7 nh\u1ef1a. C\u00e1c h\u1ea1t silica h\u00ecnh c\u1ea7u ho\u1ea1t \u0111\u1ed9ng nh\u01b0 c\u00e1c vi\u00ean bi trong h\u1ed7n h\u1ee3p \u2013 ch\u00fang quay t\u1ef1 do qua l\u1ea1i v\u1edbi nhau, cho ph\u00e9p h\u00e0m l\u01b0\u1ee3ng ch\u1ea5t \u0111\u1ed9n cao (l\u00ean \u0111\u1ebfn 85-90% theo tr\u1ecdng l\u01b0\u1ee3ng) m\u00e0 kh\u00f4ng l\u00e0m cho \u0111\u1ed9 nh\u1edbt tr\u1edf n\u00ean kh\u00f3 thao t\u00e1c. H\u00e0m l\u01b0\u1ee3ng cao n\u00e0y l\u00e0 \u0111i\u1ec1u gi\u00fap \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ef1 gi\u1ea3m h\u1ec7 s\u1ed1 gi\u00e3n n\u1edf nhi\u1ec7t (CTE) c\u1ea7n thi\u1ebft \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi silicon. <\/p>\n\n\n\n<p>Silica h\u00ecnh c\u1ea7u \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p c\u1ea7u h\u00f3a b\u1eb1ng ng\u1ecdn l\u1eeda ho\u1eb7c t\u1ed5ng h\u1ee3p sol-gel v\u00e0 \u0111\u1eaft h\u01a1n silica h\u00ecnh g\u00f3c c\u1ea1nh. Silica h\u00ecnh g\u00f3c c\u1ea1nh \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t b\u1eb1ng c\u00e1ch nghi\u1ec1n v\u00e0 m\u00e0i, t\u1ea1o ra c\u00e1c h\u00ecnh d\u1ea1ng kh\u00f4ng \u0111\u1ec1u, l\u1edfm ch\u1edfm. S\u1ef1 li\u00ean k\u1ebft c\u1ee7a c\u00e1c h\u1ea1t h\u00ecnh g\u00f3c c\u1ea1nh trong v\u1eadt li\u1ec7u composite \u0111\u00e3 \u0111\u00f3ng r\u1eafn gi\u00fap c\u1ea3i thi\u1ec7n \u0111\u1ed9 b\u00e1m d\u00ednh c\u01a1 h\u1ecdc gi\u1eefa ch\u1ea5t \u0111\u1ed9n v\u00e0 nh\u1ef1a, l\u00e0m t\u0103ng \u0111\u1ed9 b\u1ec1n u\u1ed1n v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng n\u1ee9t. Nh\u01b0\u1ee3c \u0111i\u1ec3m l\u00e0 \u0111\u1ed9 nh\u1edbt cao h\u01a1n \u0111\u00e1ng k\u1ec3 \u1edf c\u00f9ng m\u1ed9t t\u1ef7 l\u1ec7 ch\u1ea5t \u0111\u1ed9n, \u0111i\u1ec1u n\u00e0y h\u1ea1n ch\u1ebf l\u01b0\u1ee3ng ch\u1ea5t \u0111\u1ed9n c\u00f3 th\u1ec3 k\u1ebft h\u1ee3p. \u0110\u1ed1i v\u1edbi h\u1ea7u h\u1ebft c\u00e1c \u1ee9ng d\u1ee5ng EMC hi\u1ec7n \u0111\u1ea1i, n\u01a1i ki\u1ec3m so\u00e1t h\u1ec7 s\u1ed1 gi\u00e3n n\u1edf nhi\u1ec7t (CTE) l\u00e0 \u01b0u ti\u00ean h\u00e0ng \u0111\u1ea7u, silica h\u00ecnh c\u1ea7u l\u00e0 l\u1ef1a ch\u1ecdn m\u1eb7c \u0111\u1ecbnh. Silica h\u00ecnh g\u00f3c c\u1ea1nh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng khi \u0111\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc ho\u1eb7c chi ph\u00ed th\u1ea5p h\u01a1n l\u00e0 y\u1ebfu t\u1ed1 ch\u00ednh.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\">Ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t (PSD) c\u1ee7a ch\u1ea5t \u0111\u1ed9n silica \u1ea3nh h\u01b0\u1edfng nh\u01b0 th\u1ebf n\u00e0o \u0111\u1ebfn h\u1eb1ng s\u1ed1 \u0111i\u1ec7n m\u00f4i (\u0394k) trong c\u00e1c t\u1ea5m PCB?<\/h3>\n\n\n\n<p>H\u1eb1ng s\u1ed1 \u0111i\u1ec7n m\u00f4i c\u1ee7a t\u1ea5m n\u1ec1n PCB l\u00e0 gi\u00e1 tr\u1ecb trung b\u00ecnh c\u00f3 tr\u1ecdng s\u1ed1 theo th\u1ec3 t\u00edch c\u1ee7a c\u00e1c gi\u00e1 tr\u1ecb Dk c\u1ee7a c\u00e1c th\u00e0nh ph\u1ea7n c\u1ea5u t\u1ea1o n\u00ean n\u00f3. \u0110\u00f3 l\u00e0 nh\u1ef1a epoxy (Dk x\u1ea5p x\u1ec9 4.0), ch\u1ea5t \u0111\u1ed9n silica (Dk x\u1ea5p x\u1ec9 3.8 \u0111\u1ed1i v\u1edbi silica nung ch\u1ea3y), v\u00e0 b\u1ea5t k\u1ef3 kho\u1ea3ng tr\u1ed1ng ho\u1eb7c t\u00fai kh\u00ed n\u00e0o (Dk = 1.0). T\u00fai kh\u00ed l\u00e0 bi\u1ebfn s\u1ed1 quan tr\u1ecdng. Khi ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t (PSD) c\u1ee7a ch\u1ea5t \u0111\u1ed9n silica r\u1ed9ng ho\u1eb7c \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t k\u00e9m, vi\u1ec7c \u0111\u00f3ng g\u00f3i h\u1ea1t kh\u00f4ng hi\u1ec7u qu\u1ea3 v\u00e0 c\u00e1c kho\u1ea3ng tr\u1ed1ng h\u00ecnh th\u00e0nh t\u1ea1i giao di\u1ec7n gi\u1eefa nh\u1ef1a v\u00e0 ch\u1ea5t \u0111\u1ed9n. Nh\u1eefng kho\u1ea3ng tr\u1ed1ng n\u00e0y l\u00e0m gi\u1ea3m Dk c\u1ee7a v\u1eadt li\u1ec7u composite xu\u1ed1ng d\u01b0\u1edbi gi\u00e1 tr\u1ecb thi\u1ebft k\u1ebf v\u00e0, nghi\u00eam tr\u1ecdng h\u01a1n, g\u00e2y ra s\u1ef1 bi\u1ebfn \u0111\u1ed5i Dk gi\u1eefa c\u00e1c l\u00f4 s\u1ea3n ph\u1ea9m. \u0110i\u1ec1u n\u00e0y l\u00e0 do t\u1ef7 l\u1ec7 kho\u1ea3ng tr\u1ed1ng thay \u0111\u1ed5i theo t\u1eebng l\u00f4. Ki\u1ec3m so\u00e1t PSD ch\u1eb7t ch\u1ebd \u2014 c\u1ee5 th\u1ec3 l\u00e0 ki\u1ec3m so\u00e1t gi\u00e1 tr\u1ecb span sao cho m\u1eadt \u0111\u1ed9 \u0111\u00f3ng g\u00f3i h\u1ea1t nh\u1ea5t qu\u00e1n. \u0110i\u1ec1u n\u00e0y gi\u00fap gi\u1ea3m thi\u1ec3u s\u1ef1 h\u00ecnh th\u00e0nh kho\u1ea3ng tr\u1ed1ng v\u00e0 \u1ed5n \u0111\u1ecbnh Dk gi\u1eefa c\u00e1c l\u00f4 s\u1ea3n ph\u1ea9m. \u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng s\u00f3ng mm 5G \u1edf t\u1ea7n s\u1ed1 28 GHz tr\u1edf l\u00ean, s\u1ef1 bi\u1ebfn \u0111\u1ed5i Dk l\u1edbn h\u01a1n +\/- 0.05 l\u00e0 \u0111\u1ee7 \u0111\u1ec3 l\u00e0m l\u1ec7ch t\u1ea7n s\u1ed1 c\u00e1c ph\u1ea7n t\u1eed anten v\u00e0 kh\u00f4ng \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt \u0111i\u1ec7n.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><mark style=\"background-color:rgba(0, 0, 0, 0);color:#cf2e2e\" class=\"has-inline-color\">B\u1ed9t Epic<\/mark><\/h2>\n\n\n\n<p><strong><a href=\"http:\/\/quartz-grinding.com\">B\u1ed9t Epic<\/a><\/strong>V\u1edbi h\u01a1n 20 n\u0103m kinh nghi\u1ec7m trong ng\u00e0nh c\u00f4ng nghi\u1ec7p b\u1ed9t si\u00eau m\u1ecbn, ch\u00fang t\u00f4i t\u00edch c\u1ef1c th\u00fac \u0111\u1ea9y s\u1ef1 ph\u00e1t tri\u1ec3n t\u01b0\u01a1ng lai c\u1ee7a b\u1ed9t si\u00eau m\u1ecbn, t\u1eadp trung v\u00e0o c\u00e1c quy tr\u00ecnh nghi\u1ec1n, xay, ph\u00e2n lo\u1ea1i v\u00e0 c\u1ea3i ti\u1ebfn b\u1ed9t si\u00eau m\u1ecbn. Li\u00ean h\u1ec7 v\u1edbi ch\u00fang t\u00f4i \u0111\u1ec3 \u0111\u01b0\u1ee3c t\u01b0 v\u1ea5n mi\u1ec5n ph\u00ed v\u00e0 c\u00e1c gi\u1ea3i ph\u00e1p t\u00f9y ch\u1ec9nh! \u0110\u1ed9i ng\u0169 chuy\u00ean gia c\u1ee7a ch\u00fang t\u00f4i cam k\u1ebft cung c\u1ea5p c\u00e1c s\u1ea3n ph\u1ea9m v\u00e0 d\u1ecbch v\u1ee5 ch\u1ea5t l\u01b0\u1ee3ng cao \u0111\u1ec3 t\u1ed1i \u0111a h\u00f3a gi\u00e1 tr\u1ecb qu\u00e1 tr\u00ecnh gia c\u00f4ng b\u1ed9t c\u1ee7a b\u1ea1n. Epic Powder \u2013 Chuy\u00ean gia gia c\u00f4ng b\u1ed9t \u0111\u00e1ng tin c\u1eady c\u1ee7a b\u1ea1n!\u00a0<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity is-style-default\"\/>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized is-style-rounded\"><img decoding=\"async\" width=\"602\" height=\"602\" src=\"http:\/\/quartz-grinding.com\/wp-content\/uploads\/2025\/11\/Mr-Wang.webp\" alt=\"\u00d4ng V\u01b0\u01a1ng\" class=\"wp-image-16219\" style=\"width:150px;height:150px\" srcset=\"https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2025\/11\/Mr-Wang.webp 602w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2025\/11\/Mr-Wang-300x300.webp 300w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2025\/11\/Mr-Wang-100x100.webp 100w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2025\/11\/Mr-Wang-12x12.webp 12w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2025\/11\/Mr-Wang-600x600.webp 600w\" sizes=\"(max-width: 602px) 100vw, 602px\" \/><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote has-text-align-center is-style-large is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-medium-font-size\">C\u1ea3m \u01a1n b\u1ea1n \u0111\u00e3 \u0111\u1ecdc. T\u00f4i hy v\u1ecdng b\u00e0i vi\u1ebft c\u1ee7a t\u00f4i c\u00f3 \u00edch. Vui l\u00f2ng \u0111\u1ec3 l\u1ea1i b\u00ecnh lu\u1eadn b\u00ean d\u01b0\u1edbi. B\u1ea1n c\u0169ng c\u00f3 th\u1ec3 li\u00ean h\u1ec7 v\u1edbi \u0111\u1ea1i di\u1ec7n kh\u00e1ch h\u00e0ng tr\u1ef1c tuy\u1ebfn c\u1ee7a EPIC Powder <strong><mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff6900\" class=\"has-inline-color\">Zelda<\/mark><\/strong> \u0111\u1ec3 bi\u1ebft th\u00eam b\u1ea5t k\u1ef3 th\u00f4ng tin n\u00e0o kh\u00e1c.\u201d<\/p>\n<cite>                                                                                                                                                 \u2014 <strong><mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff6900\" class=\"has-inline-color\">Jason Wang<\/mark><\/strong>, <em>K\u1ef9 s\u01b0<\/em><\/cite><\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity is-style-default\"\/>\n\n\n\n<div class=\"wp-block-contact-form-7-contact-form-selector\">\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f15703-o1\" lang=\"zh-CN\" dir=\"ltr\" data-wpcf7-id=\"15703\">\n<div class=\"screen-reader-response\"><p 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Those numbers are [&hellip;]<\/p>","protected":false},"author":1,"featured_media":16032,"comment_status":"closed","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":"","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":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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