Trong th\u1ef1c t\u1ebf cu\u1ed9c s\u1ed1ng h\u1eb1ng ng\u00e0y ta th\u01b0\u1eddng ti\u1ebfp x\u00fac v\u1edbi nhi\u1ec1u lo\u1ea1i \u0111\u1ed3 g\u1ed1m s\u1ee9: chum, v\u1ea1i, ch\u00e9n, b\u00e1t\u2026 N\u00f3i \u0111\u1ebfn g\u1ed1m s\u1ee9 th\u01b0\u1eddng \u0111i li\u1ec1n v\u1edbi kh\u00e1i ni\u1ec7m “h\u00e0ng d\u1ec5 v\u1ee1, nh\u1eb9 tay”. Th\u1ebf li\u1ec7u c\u00f3 th\u1ec3 d\u00f9ng g\u1ed1m s\u1ee9 \u0111\u1ec3 ch\u1ebf t\u1ea1o dao c\u1eaft g\u1ecdt hay kh\u00f4ng? C\u00f3 \u0111i\u1ec1u khi\u1ebfn ng\u01b0\u1eddi ta l\u1ea5y l\u00e0m l\u1ea1 l\u00e0 kh\u00f4ng nh\u1eefng c\u00f3 th\u1ec3 d\u00f9ng g\u1ed1m s\u1ee9 ch\u1ebf t\u1ea1o dao c\u1eaft g\u1ecdt m\u00e0 dao c\u1eaft g\u1ecdt ch\u1ebf t\u1ea1o b\u1eb1ng g\u1ed1m s\u1ee9 c\u00f3 th\u1ec3 “c\u1eaft s\u1eaft th\u00e9p nh\u01b0 c\u1eaft b\u00f9n”.<\/p>\n\n\n\n
Trong gia \u0111\u00ecnh h\u1ecd nh\u00e0 g\u1ed1m c\u00f3 kh\u00f4ng \u00edt c\u00e1c th\u00e0nh vi\u00ean c\u00f3 \u0111\u1ed9 c\u1ee9ng v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 r\u1ea5t cao, c\u00f3 t\u00ednh b\u1ec1n v\u1edbi nhi\u1ec7t \u0111\u1ed9, c\u00f3 th\u1ec3 ch\u1ebf t\u1ea1o c\u00e1c dao c\u1eaft g\u1ecdt kim lo\u1ea1i c\u00f3 nhi\u1ec1u t\u00ednh n\u0103ng kh\u00e1c nhau. C\u00e1c lo\u1ea1i g\u1ed1m: Nh\u00f4m oxit, g\u1ed1m silic nhi\u1ec5m nit\u01a1 nhi\u1ec7t \u00e1p\u2026 l\u00e0 nh\u1eefng v\u00ed d\u1ee5.<\/p>\n\n\n\n
G\u1ed1m nh\u00f4m oxit c\u00f3 th\u1ec3 b\u1ec1n \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 2000\u00b0C c\u00f2n c\u00e1c kim lo\u1ea1i n\u00f3i chung ch\u1ec9 c\u1ea7n \u1edf nhi\u1ec7t \u0111\u1ed9 1500\u00b0C l\u00e0 \u0111\u00e3 m\u1ec1m nh\u0169n, c\u00f2n c\u00f3 th\u1ec3 n\u00f3i g\u00ec \u0111\u1ebfn \u0111\u1ed9 c\u1ee9ng. Th\u1ef1c t\u1ebf th\u00ec g\u1ed1m nh\u00f4m oxit c\u00f3 \u0111\u1ed9 c\u1ee9ng v\u01b0\u1ee3t qu\u00e1 b\u1ea5t k\u1ef3 kim lo\u1ea1i n\u00e0o. D\u00f9ng g\u1ed1m nh\u00f4m oxit l\u00e0m dao c\u1eaft kh\u00f4ng ch\u1ec9 c\u1eaft g\u1ecdt \u0111\u01b0\u1ee3c gang \u0111\u00fac m\u00e0 c\u00f2n c\u00f3 th\u1ec3 c\u1eaft g\u1ecdt \u0111\u01b0\u1ee3c th\u00e9p cao t\u1ed1c (th\u00e9p gi\u00f3) v\u1edbi t\u1ed1c \u0111\u1ed9 \u0103n dao r\u1ea5t l\u1edbn, t\u1ed1c \u0111\u1ed9 c\u1eaft nhanh. V\u1ea3 l\u1ea1i khi d\u00f9ng lo\u1ea1i dao c\u1eaft n\u00e0y, ng\u01b0\u1eddi ta kh\u00f4ng c\u1ea7n ph\u1ea3i \u0111\u1ed5i dao, m\u00e0i dao n\u00ean c\u00f3 hi\u1ec7u su\u1ea5t l\u00e0m vi\u1ec7c v\u01b0\u1ee3t qua c\u00e1c lo\u1ea1i dao h\u1ee3p kim nhi\u1ec1u l\u1ea7n. Ngo\u00e0i ra tu\u1ed5i th\u1ecd c\u1ee7a lo\u1ea1i dao n\u00e0y l\u1edbn h\u01a1n dao h\u1ee3p kim t\u1eeb 3 \u0111\u1ebfn 6 l\u1ea7n.<\/p>\n\n\n\n
G\u1ed1m silic nhi\u1ec5m nit\u01a1 nhi\u1ec7t \u00e1p (ch\u1ebf t\u1ea1o \u1edf nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u00e1p su\u1ea5t cao) c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 ch\u1ed1ng cong v\u00eanh t\u1eeb 80.000 – 100.000 N\/cm2. Khi t\u0103ng nhi\u1ec7t \u0111\u1ed9 \u0111\u1ebfn 1200\u00b0C th\u00ec c\u0169ng kh\u00f4ng l\u00e0m thay \u0111\u1ed5i c\u01b0\u1eddng \u0111\u1ed9. N\u1ebfu th\u00eam v\u00e0o th\u00e0nh ph\u1ea7n c\u1ee7a g\u1ed1m c\u00e1c oxit nh\u01b0 ytri oxit v\u00e0 nh\u00f4m oxit c\u00f3 th\u1ec3 t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 ch\u1ed1ng cong v\u00eanh \u0111\u1ebfn 150.000 N\/cm2, t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi th\u00e9p h\u1ee3p kim c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 l\u1edbn nh\u1ea5t.<\/p>\n\n\n\n
N\u1ebfu d\u00f9ng g\u1ed1m silic nhi\u1ec5m nit\u01a1 nhi\u1ec7t c\u00f3 \u0111\u1ed9 b\u1ec1n nhi\u1ec7t v\u00e0 \u0111\u1ed9 c\u1ee9ng cao, m\u1eb7t c\u1eaft b\u00f3ng v\u00e0 b\u1ea3n th\u00e2n dao \u00edt b\u1ecb m\u00f2n, v\u01b0\u1ee3t xa nhi\u1ec1u lo\u1ea1i dao th\u00e9p h\u1ee3p kim cho n\u00ean ng\u01b0\u1eddi ta g\u1ecdi \u0111\u00f3 l\u00e0 “dao c\u1eaft qu\u00fd”.<\/p>\n\n\n\n
V\u1eadt li\u1ec7u g\u1ed1m c\u00f2n d\u00f9ng \u0111\u1ec3 ch\u1ebf t\u1ea1o c\u00e1c \u1ed5 tr\u1ee5c ch\u1ecbu m\u00e0i m\u00f2n, ch\u1ecbu \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 cao, \u0111\u1ec3 ch\u1ebf t\u1ea1o c\u00e1nh v\u00e0 tr\u1ee5c quay c\u1ee7a tu\u1ed1c bin. Trong nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p, kh\u00f3 c\u00f3 th\u1ec3 so s\u00e1nh v\u1eadt li\u1ec7u g\u1ed1m v\u1edbi kim lo\u1ea1i.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: G\u1ed1m; Dao c\u1eaft g\u1ed1m.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
Trong th\u1ef1c t\u1ebf cu\u1ed9c s\u1ed1ng h\u1eb1ng ng\u00e0y ta th\u01b0\u1eddng ti\u1ebfp x\u00fac v\u1edbi nhi\u1ec1u lo\u1ea1i \u0111\u1ed3 g\u1ed1m s\u1ee9: chum, v\u1ea1i, ch\u00e9n, b\u00e1t\u2026 N\u00f3i \u0111\u1ebfn g\u1ed1m s\u1ee9 th\u01b0\u1eddng \u0111i li\u1ec1n v\u1edbi kh\u00e1i ni\u1ec7m “h\u00e0ng d\u1ec5 v\u1ee1, nh\u1eb9 tay”. Th\u1ebf li\u1ec7u c\u00f3 th\u1ec3 d\u00f9ng g\u1ed1m s\u1ee9 \u0111\u1ec3 ch\u1ebf t\u1ea1o dao c\u1eaft g\u1ecdt hay kh\u00f4ng? C\u00f3 \u0111i\u1ec1u khi\u1ebfn ng\u01b0\u1eddi […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[8,15],"tags":[],"class_list":["post-7846","post","type-post","status-publish","format-standard","hentry","category-hoa-hoc","category-hoi-dap-khoa-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7846","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=7846"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7846\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=7846"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=7846"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=7846"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}