{"id":919,"date":"2019-05-08T11:08:31","date_gmt":"2019-05-08T04:08:31","guid":{"rendered":"https:\/\/www.baohotoandien.com\/blog\/?p=919"},"modified":"2025-03-09T16:29:16","modified_gmt":"2025-03-09T09:29:16","slug":"kevlar","status":"publish","type":"post","link":"https:\/\/baohotoandien.com\/blog\/kevlar\/","title":{"rendered":"Kevlar"},"content":{"rendered":"

V\u1eadt li\u1ec7u Kevlar l\u00e0 g\u00ec?<\/h2>\n

Kevlar<\/b>\u00a0l\u00e0 nh\u00e3n hi\u1ec7u \u0111\u01b0\u1ee3c \u0111\u0103ng k\u00fd cho m\u1ed9t lo\u1ea1i\u00a0s\u1ee3i t\u1ed5ng h\u1ee3p aramid\u00a0\u0111anh, c\u1ee9ng<\/strong>\u00a0v\u00e0 \u0111\u01b0\u1ee3c nhi\u1ec1u ng\u01b0\u1eddi bi\u1ebft t\u1edbi v\u1edbi \u1ee9ng d\u1ee5ng gia c\u1ed1 nh\u1ef1a t\u1ed5ng h\u1ee3p trong \u00e1o ch\u1ed1ng \u0111\u1ea1n ho\u1eb7c d\u1ee5ng c\u1ee5 h\u1ed9 th\u00e2n. \u0110\u01b0\u1ee3c ph\u00e1t tri\u1ec3n t\u1ea1i\u00a0DuPont<\/strong> v\u00e0o n\u0103m 1965. \u0110\u1ebfn \u0111\u1ea7u n\u0103m 1970, v\u1eadt li\u1ec7u c\u01b0\u1eddng \u0111\u1ed9 cao n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng th\u01b0\u01a1ng m\u1ea1i \u0111\u1ea7u ti\u00ean ZOMCLUB<\/a> nh\u01b0 l\u00e0 m\u1ed9t gi\u1ea3i ph\u00e1p thay th\u1ebf cho th\u00e9p trong l\u1ed1p xe \u0111ua.<\/p>\n

\"V\u1eadt<\/p>\n

C\u1ea5u tr\u00fac h\u00f3a h\u1ecdc<\/h2>\n

C\u00f4ng th\u1ee9c ph\u00e2n t\u1eed :\u00a0\u00a0[-CO-CO-C6<\/sub>H4<\/sub>-CO-NH-C6<\/sub>H4<\/sub>-NH-]n<\/sub><\/strong><\/p>\n

\"C\u1ea5u<\/p>\n

Thu\u1ed9c t\u00ednh v\u1eadt l\u00fd v\u1eadt li\u1ec7u Kevlar<\/h2>\n\n\n\n\n\n\n\n
\u0110\u1ed9 b\u1ec1n k\u00e9o<\/td>\n\u00a02600-3700 MPa<\/td>\n<\/tr>\n
\u00a0M\u00f4 \u0111un \u0111\u00e0n h\u1ed3i<\/td>\n\u00a062-160 GPa<\/td>\n<\/tr>\n
\u00a0\u0110\u01b0\u1eddng k\u00ednh<\/td>\n\u00a010-12 micr\u00f4m\u00e9t<\/td>\n<\/tr>\n
\u00a0M\u1eadt \u0111\u1ed9<\/td>\n\u00a01.45g\/cm3<\/sup><\/td>\n<\/tr>\n
\u00a0Gi\u1edbi h\u1ea1n nhi\u1ec7t \u0111\u1ed9<\/td>\n\u00a0204-2600<\/sup>C<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u01afu \u0111i\u1ec3m<\/h3>\n

\u0110\u00e2y l\u00e0 m\u1ed9t s\u1ed1 thu\u1ed9c t\u00ednh n\u1ed5i b\u1eadt c\u1ee7a Kevlar:<\/p>\n

    \n
  1. N\u00f3\u00a0m\u1ea1nh nh\u01b0ng t\u01b0\u01a1ng \u0111\u1ed1i nh\u1eb9<\/strong>. \u0110\u1ed9 b\u1ec1n khi k\u00e9o (k\u00e9o c\u0103ng ho\u1eb7c k\u00e9o gi\u00e3n) c\u1ee7a n\u00f3 g\u1ea5p 5-8 l\u1ea7n th\u00e9p.<\/strong><\/li>\n
  2. Kh\u00f4ng gi\u1ed1ng nh\u01b0 h\u1ea7u h\u1ebft c\u00e1c lo\u1ea1i v\u1eadt li\u1ec7u t\u1ed5ng h\u1ee3p kh\u00e1c, n\u00f3 kh\u00f4ng tan ch\u1ea3y. N\u00f3\u00a0ch\u1ecbu \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 kh\u00e1 cao<\/strong>. V\u00e0 ch\u1ec9 b\u1eaft \u0111\u1ea7u tan ch\u1ea3y khi \u0111\u1ea1t \u0111\u1ebfn\u00a0450o<\/sup>C (850o<\/sup>F)<\/strong>. Kevlar c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1ed1t ch\u00e1y. Nh\u01b0ng qu\u00e1 tr\u00ecnh ch\u00e1y\u00a0ng\u01b0ng ngay khi ngu\u1ed3n nhi\u1ec7t b\u1ecb lo\u1ea1i b\u1ecf<\/strong>.<\/li>\n
  3. Nhi\u1ec7t \u0111\u1ed9 th\u1ea5p<\/strong>\u00a0c\u0169ng kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn Kevlar: Dupont nh\u1eadn th\u1ea5y\u00a0‘Kh\u00f4ng c\u00f3 s\u1ef1 h\u1ea5p th\u1ee5 hay suy tho\u00e1i’<\/strong>\u00a0cho t\u1edbi\u00a0-196o<\/sup>C (-320o<\/sup>F)<\/strong><\/li>\n
  4. Gi\u1ed1ng nh\u01b0 c\u00e1c lo\u1ea1i nh\u1ef1a kh\u00e1c, vi\u1ec7c ti\u1ebfp x\u00fac l\u00e2u v\u1edbi \u00e1nh s\u00e1ng c\u1ef1c t\u00edm (v\u00ed d\u1ee5 \u00e1nh s\u00e1ng m\u1eb7t tr\u1eddi) g\u00e2y ra s\u1ef1\u00a0\u0111\u1ed5i m\u00e0u v\u00e0 l\u00e0m xu\u1ed1ng c\u1ea5p<\/strong>\u00a0s\u1ee3i Kevlar<\/li>\n
  5. Kevlar c\u00f3 th\u1ec3\u00a0ch\u1ed1ng nhi\u1ec1u lo\u1ea1i h\u00f3a ch\u1ea5t kh\u00e1c nhau<\/strong>. Tuy nhi\u00ean n\u1ebfu ti\u1ebfp x\u00fac qu\u00e1 l\u00e2u v\u1edbi axit ho\u1eb7c bazo m\u1ea1nh s\u1ebd l\u00e0m n\u00f3 b\u1ecb y\u1ebfu d\u1ea7n theo th\u1eddi gian. Trong c\u00e1c th\u1eed nghi\u1ec7m c\u1ee7a DuPont, Kevlar v\u1eabn ‘h\u1ea7u nh\u01b0 kh\u00f4ng thay \u0111\u1ed5i’ sau khi ti\u1ebfp x\u00fac v\u1edbi n\u01b0\u1edbc trong h\u01a1n 200 ng\u00e0y v\u00e0 c\u00e1c \u0111\u1eb7c t\u00ednh kh\u00e1c c\u1ee7a n\u00f3 h\u1ea7u nh\u01b0 kh\u00f4ng b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi \u0111\u1ed9 \u1ea9m.<\/li>\n<\/ol>\n

    Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/h3>\n

    Kevlar c\u0169ng c\u00f3 nh\u1eefng nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a n\u00f3. M\u1eb7c d\u00f9 c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 k\u00e9o r\u1ea5t cao nh\u01b0ng n\u00f3 c\u00f3\u00a0c\u01b0\u1eddng \u0111\u1ed9 n\u00e9n r\u1ea5t y\u1ebfu<\/strong>\u00a0(kh\u1ea3 n\u0103ng ch\u1ed1ng va \u0111\u1eadp ho\u1eb7c \u00e9p). \u0110\u00f3 l\u00e0 l\u00fd do v\u00ec sao Kevlar kh\u00f4ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng thay th\u1ebf th\u00e9p l\u00e0m v\u1eadt li\u1ec7u ch\u00ednh trong x\u00e2y d\u1ef1ng t\u00f2a nh\u00e0, c\u1ea7u v\u00e0 c\u00e1c c\u1ea5u tr\u00fac c\u1ea7n ch\u1ecbu n\u00e9n kh\u00e1c<\/p>\n

    Xem th\u00eam: Test \u0111\u1ed9 b\u1ec1n c\u1ee7a Kevlar v\u1edbi Th\u00e9p<\/p>\n