{"id":9572,"date":"2026-05-29T16:06:50","date_gmt":"2026-05-29T08:06:50","guid":{"rendered":"https:\/\/rysilicone.com\/?p=9572"},"modified":"2026-06-22T10:24:22","modified_gmt":"2026-06-22T02:24:22","slug":"silicone-thermal-conductivity","status":"publish","type":"post","link":"https:\/\/rysilicone.com\/vi\/silicone-thermal-conductivity\/","title":{"rendered":"\u0110\u1ed9 d\u1eabn nhi\u1ec7t v\u00e0 ph\u1ea1m vi nhi\u1ec7t \u0111\u1ed9 c\u1ee7a silicon: Gi\u00e1 tr\u1ecb, gi\u1edbi h\u1ea1n v\u00e0 so s\u00e1nh v\u1eadt li\u1ec7u."},"content":{"rendered":"

N\u1ebfu b\u1ea1n \u0111ang t\u00ecm lo\u1ea1i silicone cho m\u1ed9t b\u1ed9 ph\u1eadn ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao ho\u1eb7c th\u1ea5p, b\u1ea1n ch\u1ec9 c\u1ea7n hai con s\u1ed1 v\u00e0 m\u1ed9t gi\u1edbi h\u1ea1n, ch\u1ee9 kh\u00f4ng ph\u1ea3i m\u1ed9t b\u00e0i gi\u1ea3ng h\u00f3a h\u1ecdc. H\u1ea7u h\u1ebft c\u00e1c trang th\u00f4ng tin \u0111\u1ec1u gi\u1ea5u nh\u1eefng con s\u1ed1 \u0111\u00f3 d\u01b0\u1edbi l\u1edbp th\u00f4ng tin d\u00e0i d\u00f2ng, khi\u1ebfn ng\u01b0\u1eddi mua ph\u1ea3i g\u1ecdi \u0111i\u1ec7n h\u1ecfi ch\u00fang t\u00f4i nh\u1eefng g\u00ec h\u1ecd c\u00f3 th\u1ec3 \u0111\u1ecdc ch\u1ec9 trong m\u1ed9t d\u00f2ng.<\/p>\n\n\n\n

Silicone c\u00f3 \u0111\u1ed9 d\u1eabn nhi\u1ec7t th\u1ea5p \u2014 kho\u1ea3ng 0,2 W\/m\u00b7K \u2014 v\u00e0 ph\u1ea1m vi ho\u1ea1t \u0111\u1ed9ng li\u00ean t\u1ee5c ti\u00eau chu\u1ea9n t\u1eeb -60\u00b0C \u0111\u1ebfn +230\u00b0C. N\u00f3 c\u00e1ch nhi\u1ec7t h\u01a1n l\u00e0 d\u1eabn nhi\u1ec7t, tr\u1eeb khi \u0111\u01b0\u1ee3c pha tr\u1ed9n v\u1edbi c\u00e1c ch\u1ea5t ph\u1ee5 gia g\u1ed1m ho\u1eb7c kim lo\u1ea1i.<\/strong><\/p>\n\n\n\n

T\u1ea5t c\u1ea3 nh\u1eefng th\u00f4ng tin b\u00ean d\u01b0\u1edbi \u0111\u1ec1u l\u00e0 chi ti\u1ebft \u0111\u1eb1ng sau c\u00e2u n\u00f3i \u0111\u00f3: c\u00e1c gi\u00e1 tr\u1ecb, gi\u1edbi h\u1ea1n th\u1ef1c t\u1ebf n\u1eb1m \u1edf \u0111\u00e2u, v\u00e0 c\u00e1ch silicone so s\u00e1nh v\u1edbi c\u00e1c lo\u1ea1i cao su m\u00e0 n\u00f3 th\u01b0\u1eddng c\u1ea1nh tranh.<\/p>\n\n\n\n

\"Cao
Cao su silicon ng\u0103n ch\u1eb7n s\u1ef1 truy\u1ec1n nhi\u1ec7t \u1edf ph\u00eda n\u00f3ng v\u00e0 gi\u1eef cho ph\u00eda c\u00f2n l\u1ea1i m\u00e1t \u2013 n\u00f3 l\u00e0 ch\u1ea5t c\u00e1ch nhi\u1ec7t, ch\u1ee9 kh\u00f4ng ph\u1ea3i ch\u1ea5t d\u1eabn nhi\u1ec7t.<\/figcaption><\/figure>\n\n\n\n

<\/p>\n\n\n\n

\u0110\u1ed9 d\u1eabn nhi\u1ec7t c\u1ee7a silicon l\u00e0 g\u00ec?<\/h2>\n\n\n\n

Cao su silicon kh\u00f4ng ch\u1ee9a ch\u1ea5t \u0111\u1ed9n (VMQ) c\u00f3 h\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t kho\u1ea3ng 0,2 W\/m\u00b7K, th\u01b0\u1eddng \u0111\u01b0\u1ee3c ghi trong t\u00e0i li\u1ec7u tham kh\u1ea3o. D\u1ea3i 0,1\u20130,4 W\/m\u00b7K<\/a> t\u00f9y thu\u1ed9c v\u00e0o c\u1ea5p \u0111\u1ed9 v\u00e0 h\u00e0m l\u01b0\u1ee3ng ch\u1ea5t \u0111\u1ed9n. Polyme c\u01a1 b\u1ea3n l\u00e0 PDMS, \u0110\u1ed9 d\u1eabn nhi\u1ec7t kho\u1ea3ng 0,15 W\/m\u00b7K<\/a>, V\u00e0 c\u00e1c ph\u00e9p \u0111o trong ph\u00f2ng th\u00ed nghi\u1ec7m tr\u00ean ph\u1ea1m vi nhi\u1ec7t \u0111\u1ed9 t\u1eeb -50 \u0111\u1ebfn 150\u00b0C.<\/a> H\u00e3y gi\u1eef n\u00f3 \u1edf m\u1ee9c nhi\u1ec7t \u0111\u1ed9 th\u1ea5p \u0111\u00f3. \u0110\u1ec3 tham kh\u1ea3o, \u0111\u1ed3ng c\u00f3 h\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t kho\u1ea3ng 400 W\/m\u00b7K v\u00e0 nh\u00f4m kho\u1ea3ng 200. V\u00ec v\u1eady, silicon kh\u00f4ng ph\u1ea3i l\u00e0 ch\u1ea5t d\u1eabn nhi\u1ec7t. N\u00f3 l\u00e0 ch\u1ea5t c\u00e1ch nhi\u1ec7t, nh\u01b0ng l\u1ea1i ch\u1ecbu \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 m\u00e0 h\u1ea7u h\u1ebft c\u00e1c lo\u1ea1i nh\u1ef1a kh\u00e1c kh\u00f4ng th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c.<\/p>\n\n\n\n

\u0110\u00f3 l\u00e0 \u0111i\u1ec3m m\u00e0 ng\u01b0\u1eddi mua th\u01b0\u1eddng b\u1ecf qua: khi b\u1ea3n v\u1ebd y\u00eau c\u1ea7u "silicone ch\u1ecbu nhi\u1ec7t", h\u1ea7u nh\u01b0 lu\u00f4n c\u00f3 ngh\u0129a l\u00e0 ch\u1ecbu \u0111\u01b0\u1ee3c nhi\u1ec7t. s\u1ee9c ch\u1ed1ng c\u1ef1<\/em>, kh\u00f4ng ph\u1ea3i nhi\u1ec7t chuy\u1ec3n kho\u1ea3n<\/em>. \u0110\u00f3 l\u00e0 nh\u1eefng y\u00eau c\u1ea7u tr\u00e1i ng\u01b0\u1ee3c nhau, v\u00e0 ch\u00fang k\u00e9o vi\u1ec7c l\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u theo nh\u1eefng h\u01b0\u1edbng kh\u00e1c nhau.<\/p>\n\n\n\n

M\u1ed9t v\u00e0i l\u01b0u \u00fd nhanh v\u1ec1 \u0111\u01a1n v\u1ecb n\u00e0y: \u0111\u1ed9 d\u1eabn nhi\u1ec7t t\u00ednh b\u1eb1ng W\/m\u00b7K cho bi\u1ebft t\u1ed1c \u0111\u1ed9 truy\u1ec1n nhi\u1ec7t. b\u1edfi v\u00ec<\/em> M\u1ed9t lo\u1ea1i v\u1eadt li\u1ec7u. Ch\u1ec9 s\u1ed1 th\u1ea5p c\u00f3 ngh\u0129a l\u00e0 nhi\u1ec7t truy\u1ec1n ch\u1eadm, v\u00ec v\u1eady b\u1ec1 m\u1eb7t b\u1ea1n ch\u1ea1m v\u00e0o s\u1ebd m\u00e1t h\u01a1n trong khi m\u1eb7t kia n\u00f3ng l\u00ean. \u0110\u00f3 ch\u00ednh x\u00e1c l\u00e0 \u0111\u1eb7c t\u00ednh b\u1ea1n mong mu\u1ed1n \u1edf tay c\u1ea7m ho\u1eb7c gio\u0103ng, v\u00e0 c\u0169ng ch\u00ednh x\u00e1c l\u00e0 \u0111\u1eb7c t\u00ednh b\u1ea1n ph\u1ea3i \u0111i\u1ec1u ch\u1ec9nh b\u1eb1ng ch\u1ea5t \u0111\u1ed9n khi th\u1ef1c s\u1ef1 c\u1ea7n truy\u1ec1n nhi\u1ec7t.<\/p>\n\n\n\n

Silicon d\u1eabn nhi\u1ec7t (Lo\u1ea1i c\u00f3 ch\u1ea5t \u0111\u1ed9n)<\/h3>\n\n\n\n

Khi nhi\u1ec7m v\u1ee5 th\u1ef1c s\u1ef1 l\u00e0 d\u1eabn nhi\u1ec7t \u2014 c\u00e1c mi\u1ebfng t\u1ea3n nhi\u1ec7t, ch\u1ea5t tr\u00e1m khe h\u1edf, v\u1eadt li\u1ec7u d\u1eabn nhi\u1ec7t (TIM) d\u01b0\u1edbi CPU ho\u1eb7c m\u00f4-\u0111un ngu\u1ed3n \u2014 ch\u00fang ta kh\u00f4ng s\u1eed d\u1ee5ng silicon c\u01a1 b\u1ea3n. Ch\u00fang ta tr\u1ed9n n\u00f3 v\u1edbi alumina, boron nitride ho\u1eb7c c\u00e1c ch\u1ea5t \u0111\u1ed9n oxit kim lo\u1ea1i.<\/p>\n\n\n\n

\"Mi\u1ebfng
Mi\u1ebfng \u0111\u1ec7m d\u1eabn nhi\u1ec7t silicon m\u00e0u x\u00e1m tr\u00ean bo m\u1ea1ch ch\u1ee7 b\u00ean d\u01b0\u1edbi b\u1ed9 t\u1ea3n nhi\u1ec7t.<\/figcaption><\/figure>\n\n\n\n
Lo\u1ea1i silicon<\/strong><\/th>\u0110\u1ed9 d\u1eabn nhi\u1ec7t (W\/m\u00b7K)<\/strong><\/th>S\u1eed d\u1ee5ng th\u00f4ng th\u01b0\u1eddng<\/strong><\/th><\/tr><\/thead>
VMQ ch\u01b0a \u0111\u01b0\u1ee3c \u0111i\u1ec1n<\/td>~0.2<\/td>Gio\u0103ng, v\u00f2ng \u0111\u1ec7m, v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t, c\u00e1c b\u1ed9 ph\u1eadn \u0111\u00fac khu\u00f4n n\u00f3i chung<\/td><\/tr>
\u0110\u1ed5 \u0111\u1ea7y v\u1eeba ph\u1ea3i<\/td>0,5\u20131,0<\/td>Mi\u1ebfng t\u1ea3n nhi\u1ec7t c\u01a1 b\u1ea3n<\/td><\/tr>
D\u1eabn nhi\u1ec7t t\u1ed1t (ch\u1ee9a nhi\u1ec1u ch\u1ea5t \u0111\u1ed9n)<\/td>1.0\u20135.0+<\/td>TIM, ch\u1ea5t tr\u00e1m khe h\u1edf d\u01b0\u1edbi m\u1ea1ch \u0111i\u1ec7n t\u1eed c\u00f4ng su\u1ea5t<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

S\u1ef1 \u0111\u00e1nh \u0111\u1ed5i n\u1eb1m \u1edf kh\u00eda c\u1ea1nh c\u01a1 h\u1ecdc: c\u00e0ng nh\u1ed3i nhi\u1ec1u ch\u1ea5t \u0111\u1ed9n d\u1eabn \u0111i\u1ec7n, chi ti\u1ebft c\u00e0ng c\u1ee9ng v\u00e0 k\u00e9m \u0111\u00e0n h\u1ed3i. B\u1ea1n \u0111\u00e1nh \u0111\u1ed5i kh\u1ea3 n\u0103ng d\u1eabn \u0111i\u1ec7n l\u1ea5y t\u00ednh linh ho\u1ea1t. Ch\u00ednh s\u1ef1 c\u0103ng th\u1eb3ng \u0111\u00f3 quy\u1ebft \u0111\u1ecbnh vi\u1ec7c l\u1ef1a ch\u1ecdn lo\u1ea1i v\u1eadt li\u1ec7u, ch\u1ee9 kh\u00f4ng ph\u1ea3i ch\u1ec9 m\u1ed9t th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt duy nh\u1ea5t.<\/p>\n\n\n\n

Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc c\u1ee7a ch\u1ea5t \u0111\u1ed9n s\u1ebd quy\u1ebft \u0111\u1ecbnh gi\u1edbi h\u1ea1n. Nh\u00f4m oxit (alumina) l\u00e0 v\u1eadt li\u1ec7u ph\u1ed5 bi\u1ebfn nh\u1ea5t \u2013 r\u1ebb, \u1ed5n \u0111\u1ecbnh v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t t\u1ed1t \u1edf m\u1ee9c kho\u1ea3ng 1\u20133 W\/m\u00b7K v\u1edbi t\u1ea3i tr\u1ecdng th\u1ef1c t\u1ebf. Nitrit boron \u0111\u1ea1t \u0111\u01b0\u1ee3c kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t cao h\u01a1n, kho\u1ea3ng 3\u20136 W\/m\u00b7K, \u0111\u1ed3ng th\u1eddi v\u1eabn gi\u1eef \u0111\u01b0\u1ee3c kh\u1ea3 n\u0103ng c\u00e1ch \u0111i\u1ec7n, \u0111\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao n\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m v\u1eadt li\u1ec7u giao di\u1ec7n nhi\u1ec7t trong c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed c\u00f4ng su\u1ea5t. \u1ede nh\u1eefng n\u01a1i kh\u00f4ng y\u00eau c\u1ea7u c\u00e1ch \u0111i\u1ec7n, c\u00e1c lo\u1ea1i c\u00f3 ch\u1ee9a than ch\u00ec v\u00e0 kim lo\u1ea1i c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t cao h\u01a1n n\u1eefa, nh\u01b0ng ch\u00fang l\u1ea1i m\u1ea5t \u0111i \u0111\u1ed9 b\u1ec1n \u0111i\u1ec7n m\u00f4i v\u1ed1n l\u00e0 y\u1ebfu t\u1ed1 khi\u1ebfn silicon tr\u1edf n\u00ean h\u1ea5p d\u1eabn ngay t\u1eeb \u0111\u1ea7u. Quy t\u1eafc l\u1ef1a ch\u1ecdn r\u1ea5t ng\u1eafn g\u1ecdn: h\u00e3y ch\u1ecdn \u0111\u1ed9 d\u1eabn nhi\u1ec7t th\u1ea5p nh\u1ea5t m\u00e0 v\u1eabn \u0111\u1ea3m b\u1ea3o \u0111\u00e1p \u1ee9ng ng\u00e2n s\u00e1ch d\u1eabn nhi\u1ec7t c\u1ee7a b\u1ea1n, b\u1edfi v\u00ec m\u1ed7i \u0111i\u1ec3m W\/m\u00b7K t\u0103ng th\u00eam s\u1ebd l\u00e0m gi\u1ea3m \u0111\u1ed9 gi\u00e3n d\u00e0i, \u0111\u1ed9 b\u1ec1n x\u00e9 v\u00e0 tu\u1ed5i th\u1ecd d\u1ee5ng c\u1ee5.<\/p>\n\n\n\n

Ph\u1ea1m vi nhi\u1ec7t \u0111\u1ed9 v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t c\u1ee7a silicon<\/h2>\n\n\n\n

\u0110\u00e2y l\u00e0 con s\u1ed1 th\u1ee9 hai, v\u00e0 \u0111\u00e2y l\u00e0 l\u00fd do t\u1ea1i sao silicone l\u1ea1i v\u01b0\u1ee3t tr\u1ed9i so v\u1edbi c\u00e1c lo\u1ea1i cao su r\u1ebb h\u01a1n. Kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t th\u1ef1c ch\u1ea5t l\u00e0 ba c\u00e2u h\u1ecfi g\u1ed9p l\u1ea1i: chi ti\u1ebft ho\u1ea1t \u0111\u1ed9ng li\u00ean t\u1ee5c \u1edf nhi\u1ec7t \u0111\u1ed9 bao nhi\u00eau, nhi\u1ec7t \u0111\u1ed9 t\u0103ng \u0111\u1ed9t ng\u1ed9t l\u00e0 bao nhi\u00eau, v\u00e0 nhi\u1ec7t \u0111\u1ed9 gi\u1ea3m xu\u1ed1ng bao nhi\u00eau \u1edf \u0111\u1ea7u ra. M\u1ed9t lo\u1ea1i v\u1eadt li\u1ec7u ph\u1ea3i \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c c\u1ea3 ba y\u00eau c\u1ea7u n\u00e0y, v\u00e0 kho\u1ea3ng c\u00e1ch gi\u1eefa ch\u00fang ch\u00ednh l\u00e0 n\u01a1i m\u00e0 ng\u01b0\u1eddi ta th\u01b0\u1eddng ch\u1ecdn sai v\u1eadt li\u1ec7u.<\/p>\n\n\n\n

\"Gio\u0103ng
Gio\u0103ng v\u00e0 v\u00f2ng ch\u1eef O b\u1eb1ng silicon m\u00e0u \u0111\u1ecf g\u1ea7n m\u1eb7t b\u00edch kim lo\u1ea1i n\u00f3ng.<\/figcaption><\/figure>\n\n\n\n

Ph\u1ea1m vi ho\u1ea1t \u0111\u1ed9ng li\u00ean t\u1ee5c ti\u00eau chu\u1ea9n<\/h3>\n\n\n\n

Silicone ti\u00eau chu\u1ea9n c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 t\u1eeb -60\u00b0C \u0111\u1ebfn +230\u00b0C trong su\u1ed1t v\u00f2ng \u0111\u1eddi s\u1eed d\u1ee5ng. Ph\u1ea1m vi nhi\u1ec7t \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh n\u00e0y \u0111\u1ee7 t\u1ed1t \u0111\u1ec3 ch\u00fang t\u00f4i th\u01b0\u1eddng xuy\u00ean s\u1eed d\u1ee5ng cho h\u1ea7u h\u1ebft c\u00e1c c\u00f4ng vi\u1ec7c l\u00e0m k\u00edn, gio\u0103ng v\u00e0 \u0111\u1ed3 d\u00f9ng nh\u00e0 b\u1ebfp m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i suy ngh\u0129 nhi\u1ec1u. T\u1eeb kh\u00f3a quan tr\u1ecdng l\u00e0 "li\u00ean t\u1ee5c": \u0111\u00f3 l\u00e0 nhi\u1ec7t \u0111\u1ed9 m\u00e0 s\u1ea3n ph\u1ea9m c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c trong su\u1ed1t v\u00f2ng \u0111\u1eddi s\u1eed d\u1ee5ng m\u00e0 kh\u00f4ng l\u00e0m thay \u0111\u1ed5i \u0111\u1ed9 c\u1ee9ng, \u0111\u1ed9 b\u1ec1n k\u00e9o ho\u1eb7c l\u1ef1c l\u00e0m k\u00edn. \u0110\u00e2y l\u00e0 con s\u1ed1 \u0111\u01b0\u1ee3c ghi trong b\u1ea3ng d\u1eef li\u1ec7u m\u1ed9t c\u00e1ch th\u1eadn tr\u1ecdng, ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 con s\u1ed1 ch\u1ec9 d\u00f9ng \u0111\u01b0\u1ee3c m\u1ed9t l\u1ea7n.<\/p>\n\n\n\n

H\u00e0nh vi \u1edf nhi\u1ec7t \u0111\u1ed9 cao<\/h3>\n\n\n\n

C\u00e1c lo\u1ea1i gio\u0103ng ch\u1ecbu nhi\u1ec7t cao c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 t\u0103ng \u0111\u1ed9t ng\u1ed9t trong th\u1eddi gian ng\u1eafn l\u00ean \u0111\u1ebfn 250\u2013300\u00b0C. \u201cTh\u1eddi gian ng\u1eafn\u201d r\u1ea5t quan tr\u1ecdng: gio\u0103ng c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 280\u00b0C trong m\u1ed9t l\u1ea7n t\u0103ng ng\u1eafn v\u00e0 ph\u1ee5c h\u1ed3i, nh\u01b0ng n\u1ebfu gi\u1eef \u1edf nhi\u1ec7t \u0111\u1ed9 \u0111\u00f3 li\u00ean t\u1ee5c th\u00ec s\u1ebd l\u00e0m gi\u1ea3m tu\u1ed5i th\u1ecd. Lu\u00f4n lu\u00f4n t\u00e1ch ri\u00eang c\u00e1c b\u1ed9 ph\u1eadn. nhi\u1ec7t \u0111\u1ed9 \u0111\u1ec9nh<\/strong> t\u1eeb nhi\u1ec7t \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng li\u00ean t\u1ee5c<\/strong> Tr\u00ean b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt. Nh\u1eefng ng\u01b0\u1eddi mua h\u00e0ng \u0111\u1ecdc con s\u1ed1 c\u1ef1c \u0111\u1ea1i nh\u01b0 m\u1ed9t con s\u1ed1 ho\u1ea1t \u0111\u1ed9ng th\u01b0\u1eddng l\u00e0 nh\u1eefng ng\u01b0\u1eddi g\u1ecdi l\u1ea1i v\u1ec1 c\u00e1c b\u1ed9 ph\u1eadn b\u1ecb c\u1ee9ng v\u00e0 gi\u00f2n.<\/p>\n\n\n\n

C\u1ea5p<\/strong><\/th>D\u1ecbch v\u1ee5 li\u00ean t\u1ee5c<\/strong><\/th>\u0110\u1ec9nh ng\u1eafn<\/strong><\/th><\/tr><\/thead>
VMQ ti\u00eau chu\u1ea9n<\/td>-60 \u0111\u1ebfn +230\u00b0C<\/td>~250\u00b0C<\/td><\/tr>
VMQ nhi\u1ec7t \u0111\u1ed9 cao<\/td>+230 \u0111\u1ebfn +250\u00b0C<\/td>~300\u00b0C<\/td><\/tr>
VMQ \u1ed5n \u0111\u1ecbnh nhi\u1ec7t<\/td>l\u00ean \u0111\u1ebfn +260\u00b0C<\/td>~315\u00b0C<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

C\u00e1c lo\u1ea1i v\u1eadt li\u1ec7u \u1ed5n \u0111\u1ecbnh nhi\u1ec7t s\u1eed d\u1ee5ng oxit s\u1eaft v\u00e0 c\u00e1c ch\u1ea5t ph\u1ee5 gia nhi\u1ec7t kh\u00e1c \u0111\u1ec3 k\u00e9o d\u00e0i th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng li\u00ean t\u1ee5c l\u00ean \u0111\u1ebfn 260\u00b0C. Ch\u00fang c\u00f3 gi\u00e1 th\u00e0nh cao h\u01a1n, v\u00e0 ch\u1ec9 \u0111\u00e1ng gi\u00e1 khi chi ti\u1ebft th\u1ef1c s\u1ef1 ho\u1ea1t \u0111\u1ed9ng \u1edf d\u1ea3i nhi\u1ec7t \u0111\u1ed9 \u0111\u00f3 trong h\u00e0ng ngh\u00ecn gi\u1edd \u2014 ch\u1ee9 kh\u00f4ng ph\u1ea3i cho m\u1ed9t quy tr\u00ecnh c\u00f3 nhi\u1ec7t \u0111\u1ed9 t\u0103ng \u0111\u1ed9t ng\u1ed9t r\u1ed3i ngu\u1ed9i d\u1ea7n.<\/p>\n\n\n\n

H\u00e0nh vi \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p<\/h3>\n\n\n\n

Silicone v\u1eabn gi\u1eef \u0111\u01b0\u1ee3c \u0111\u1ed9 d\u1ebbo \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi h\u1ea7u h\u1ebft c\u00e1c ch\u1ea5t \u0111\u00e0n h\u1ed3i kh\u00e1c. C\u00e1c lo\u1ea1i ti\u00eau chu\u1ea9n gi\u1eef \u0111\u01b0\u1ee3c \u0111\u1ed9 d\u1ebbo \u1edf kho\u1ea3ng -60\u00b0C; fluorosilicone (FVMQ) c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c \u0111\u1ebfn kho\u1ea3ng -73\u00b0C. D\u01b0\u1edbi m\u1ee9c \u0111\u00f3, v\u1eadt li\u1ec7u s\u1ebd c\u1ee9ng l\u1ea1i v\u00e0 cu\u1ed1i c\u00f9ng tr\u1edf n\u00ean gi\u00f2n. \u0110\u1ed9 gi\u00f2n \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng... ASTM D746<\/a>, V\u00e0 \u0111\u00f3 l\u00e0 con s\u1ed1 c\u1ea7n ki\u1ec3m tra cho b\u1ea5t k\u1ef3 \u1ee9ng d\u1ee5ng n\u00e0o trong chu\u1ed7i cung \u1ee9ng l\u1ea1nh, h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5 ho\u1eb7c ho\u1ea1t \u0111\u1ed9ng ngo\u00e0i tr\u1eddi trong m\u00f9a \u0111\u00f4ng. Ch\u1ebf \u0111\u1ed9 h\u1ecfng h\u00f3c \u1edf \u0111\u1ea7u l\u1ea1nh kh\u00f4ng ph\u1ea3i l\u00e0 n\u1ee9t ngay ng\u00e0y \u0111\u1ea7u ti\u00ean \u2014 m\u00e0 l\u00e0 s\u1ef1 m\u1ea5t d\u1ea7n kh\u1ea3 n\u0103ng \u0111\u00e0n h\u1ed3i. M\u1ed9t l\u1edbp gio\u0103ng \u0111\u00e3 tr\u1edf n\u00ean c\u1ee9ng nh\u01b0 th\u1ee7y tinh trong \u0111i\u1ec1u ki\u1ec7n l\u1ea1nh s\u1ebd ng\u1eebng \u0111\u00e0n h\u1ed3i, v\u00e0 m\u1ed9t m\u1ed1i n\u1ed1i t\u0129nh s\u1ebd b\u1eaft \u0111\u1ea7u r\u00f2 r\u1ec9 m\u1ed9t c\u00e1ch \u00e2m th\u1ea7m. \u0110\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao \u0111i\u1ec3m gi\u00f2n, ch\u1ee9 kh\u00f4ng ph\u1ea3i nhi\u1ec7t \u0111\u1ed9 t\u1ed1i thi\u1ec3u trong catalog, m\u1edbi l\u00e0 con s\u1ed1 c\u1ea7n \u0111\u01b0\u1ee3c ghi tr\u00ean b\u1ea3n v\u1ebd.<\/p>\n\n\n\n

L\u00e3o h\u00f3a nhi\u1ec7t<\/h3>\n\n\n\n

Kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t kh\u00f4ng ph\u1ea3i l\u00e0 v\u1ea5n \u0111\u1ec1 ch\u1ec9 trong m\u1ed9t kho\u1ea3nh kh\u1eafc \u2014 m\u00e0 l\u00e0 c\u00e1ch b\u1ed9 ph\u1eadn \u0111\u00f3 ho\u1ea1t \u0111\u1ed9ng sau h\u00e0ng ngh\u00ecn gi\u1edd \u1edf nhi\u1ec7t \u0111\u1ed9 cao. Qu\u00e1 tr\u00ecnh l\u00e3o h\u00f3a nhi\u1ec7t d\u00e0i h\u1ea1n \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 theo c\u00e1c ti\u00eau ch\u00ed sau: ASTM D573<\/a>, Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y \u0111o l\u01b0\u1eddng s\u1ef1 thay \u0111\u1ed5i v\u1ec1 \u0111\u1ed9 c\u1ee9ng, \u0111\u1ed9 b\u1ec1n k\u00e9o v\u00e0 \u0111\u1ed9 gi\u00e3n d\u00e0i sau khi ti\u1ebfp x\u00fac l\u00e2u d\u00e0i v\u1edbi nhi\u1ec7t \u0111\u1ed9 cao. \u0110\u00e2y l\u00e0 y\u1ebfu t\u1ed1 ph\u00e2n bi\u1ec7t lo\u1ea1i cao su \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 \u1edf m\u1ee9c \u201c230\u00b0C\u201d v\u1edbi lo\u1ea1i ch\u1ec9 ch\u1ecbu \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 230\u00b0C m\u1ed9t l\u1ea7n. Tr\u00ean th\u1ef1c t\u1ebf, ch\u00fang ta \u0111\u1ecdc ba k\u1ebft qu\u1ea3 l\u00e3o h\u00f3a c\u00f9ng l\u00fac: \u0111\u1ed9 c\u1ee9ng t\u0103ng (cao su tr\u1edf n\u00ean c\u1ee9ng nh\u01b0 th\u1ee7y tinh), \u0111\u1ed9 gi\u00e3n d\u00e0i gi\u1ea3m (n\u00f3 b\u1ecb n\u1ee9t thay v\u00ec gi\u00e3n ra) v\u00e0 \u0111\u1ed9 b\u1ec1n k\u00e9o gi\u1ea3m. Khi ng\u01b0\u1eddi mua b\u00e1o c\u00e1o c\u00e1c b\u1ed9 ph\u1eadn b\u1ecb gi\u00f2n trong qu\u00e1 tr\u00ecnh s\u1eed d\u1ee5ng, h\u1ea7u h\u1ebft \u0111\u00f3 l\u00e0 do s\u1ef1 kh\u00f4ng ph\u00f9 h\u1ee3p gi\u1eefa qu\u00e1 tr\u00ecnh l\u00e3o h\u00f3a v\u00e0 nhi\u1ec7t \u0111\u1ed9, ch\u1ee9 kh\u00f4ng ph\u1ea3i do l\u00f4 h\u00e0ng k\u00e9m ch\u1ea5t l\u01b0\u1ee3ng.<\/p>\n\n\n\n

So s\u00e1nh nhi\u1ec7t gi\u1eefa Silicone v\u00e0 c\u00e1c ch\u1ea5t \u0111\u00e0n h\u1ed3i kh\u00e1c<\/h2>\n\n\n\n

L\u1edbp v\u1ecf c\u00e1ch nhi\u1ec7t c\u1ee7a silicone th\u1ef1c s\u1ef1 v\u01b0\u1ee3t tr\u1ed9i so v\u1edbi c\u00e1c v\u1eadt li\u1ec7u thay th\u1ebf \u1edf nh\u1eefng \u0111i\u1ec3m n\u00e0o, v\u00e0 \u1edf nh\u1eefng \u0111i\u1ec3m n\u00e0o th\u00ec kh\u00f4ng? C\u00e1c gi\u00e1 tr\u1ecb tham kh\u1ea3o \u0111i\u1ec3n h\u00ecnh:<\/p>\n\n\n\n

V\u1eadt li\u1ec7u<\/strong><\/th>\u0110\u1ed9 d\u1eabn nhi\u1ec7t (W\/m\u00b7K)<\/strong><\/th>Nhi\u1ec7t \u0111\u1ed9 li\u00ean t\u1ee5c t\u1ed1i \u0111a<\/strong><\/th>Gi\u1edbi h\u1ea1n nhi\u1ec7t \u0111\u1ed9 th\u1ea5p<\/strong><\/th><\/tr><\/thead>
Silicon (VMQ)<\/td>~0.2<\/td>230\u00b0C (\u0111\u1ec9nh \u0111i\u1ec3m kho\u1ea3ng 300\u00b0C)<\/td>-60\u00b0C (FVMQ ~-73\u00b0C)<\/td><\/tr>
NBR (nitril)<\/td>~0.25<\/td>100\u2013120\u00b0C<\/td>-30\u00b0C<\/td><\/tr>
EPDM<\/td>~0.35<\/td>130\u2013150\u00b0C<\/td>-50\u00b0C<\/td><\/tr>
PTFE<\/td>~0.25<\/td>260\u00b0C<\/td>-200\u00b0C<\/td><\/tr>
FKM (Viton)<\/td>~0.20<\/td>200\u2013230\u00b0C<\/td>-20\u00b0C<\/td><\/tr>
Cao su t\u1ef1 nhi\u00ean<\/td>~0.15<\/td>70\u201390\u00b0C<\/td>-50\u00b0C<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\"So
So s\u00e1nh ph\u1ea1m vi nhi\u1ec7t \u0111\u1ed9 l\u00e0m vi\u1ec7c li\u00ean t\u1ee5c: silicone so v\u1edbi fluorosilicone, PTFE, EPDM v\u00e0 NBR.<\/figcaption><\/figure>\n\n\n\n

<\/p>\n\n\n\n

\u0110\u1ecdc b\u1ea3ng theo ranh gi\u1edbi \u1ee9ng d\u1ee5ng:<\/p>\n\n\n\n