thi\u1ebft k\u1ebf<\/a> cho d\u00f9 c\u00f3 d\u00f9ng \u0111\u1ed9ng c\u01a1 \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o b\u1eb1ng h\u1ee3p kim ch\u1ecbu nhi\u1ec7t cao, nhi\u1ec7t \u0111\u1ed9 ch\u1ecbu \u0111\u1ef1ng cao nh\u1ea5t c\u0169ng ch\u1ec9 ch\u1eebng 1100oC, v\u01b0\u1ee3t qu\u00e1 “gi\u1edbi h\u1ea1n” \u0111\u00f3, v\u1eadt li\u1ec7u kim lo\u1ea1i ch\u1ebf t\u1ea1o \u0111\u1ed9ng c\u01a1 s\u1ebd b\u1ecb m\u1ec1m ra, th\u1eadm ch\u00ed b\u1ed1c ch\u00e1y. V\u00ec v\u1eady, kh\u00e1 nhi\u1ec1u \u00f4 t\u00f4 \u0111\u1ec1u trang b\u1ecb h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t, \u0111\u1ec3 b\u1ea3o \u0111\u1ea3m \u0111\u1ed9ng c\u01a1 c\u00f3 th\u1ec3 ti\u1ebfp t\u1ee5c v\u1eadn h\u00e0nh b\u00ecnh th\u01b0\u1eddng. Nh\u01b0ng nh\u01b0 v\u1eady, kh\u00f4ng nh\u1eefng l\u00e0m gi\u1ea3m h\u01a1n n\u1eefa hi\u1ec7u su\u1ea5t nhi\u1ec7t m\u00e0 c\u00f2n l\u00e0m t\u0103ng th\u1ec3 t\u00edch v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a to\u00e0n b\u1ed9 \u0111\u1ed9ng c\u01a1, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn vi\u1ec7c t\u0103ng t\u1ed1c \u0111\u1ed9 xe.<\/p>\n\n\n\nV\u1eady th\u00ec, c\u00f3 lo\u1ea1i v\u1eadt li\u1ec7u n\u00e0o v\u1eeba ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao m\u00e0 tr\u1ecdng l\u01b0\u1ee3ng l\u1ea1i nh\u1eb9 thay th\u1ebf cho kim lo\u1ea1i \u0111\u1ec3 ch\u1ebf t\u1ea1o \u0111\u1ed9ng c\u01a1 kh\u00f4ng? C\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 ngh\u0129 \u0111\u1ebfn g\u1ed1m s\u1ee9. \u0110i \u0111\u00f4i v\u1edbi s\u1ef1 ph\u00e1t tri\u1ec3n k\u1ef9 thu\u1eadt v\u1eadt li\u1ec7u g\u1ed1m s\u1ee9, ng\u01b0\u1eddi ta \u0111\u00e3 s\u1ea3n xu\u1ea5t \u0111\u01b0\u1ee3c lo\u1ea1i g\u1ed1m s\u1ee9 m\u1edbi c\u00f3 \u0111\u1eb7c t\u00ednh ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao, si\u00eau b\u1ec1n, \u0111\u00f3 l\u00e0 c\u00e1c lo\u1ea1i g\u1ed1m s\u1ee9 silic nitrua, coban oxit, silic cacbua v.v. ch\u00fang \u0111\u1ec1u c\u00f3 th\u1ec3 ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao tr\u00ean 1400oC, c\u00e1c \u0111\u1ed9ng c\u01a1 ch\u1ebf t\u1ea1o b\u1eb1ng c\u00e1c lo\u1ea1i g\u1ed1m s\u1ee9 n\u00e0y d\u00f9 nhi\u1ec7t \u0111\u1ed9 b\u00ean trong \u0111\u1ea1t \u0111\u1ebfn 1300oC c\u0169ng kh\u00f4ng c\u1ea7n \u0111\u1ebfn h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t ph\u1ee9c t\u1ea1p. H\u01a1n n\u1eefa, b\u1ea3n th\u00e2n c\u00e1c v\u1eadt li\u1ec7u g\u1ed1m s\u1ee9 \u0111\u00f3 \u0111\u1ec1u nh\u1eb9 h\u01a1n kim lo\u1ea1i. Do \u0111\u00f3, \u0111\u1ed9ng c\u01a1 g\u1ed1m s\u1ee9 c\u00f3 th\u1ec3 t\u00edch nh\u1ecf, tr\u1ecdng l\u01b0\u1ee3ng nh\u1eb9, hi\u1ec7u su\u1ea5t nhi\u1ec7t c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u1ebfn 50%, ti\u1ebft ki\u1ec7m \u0111\u01b0\u1ee3c h\u01a1n 20% nhi\u00ean li\u1ec7u so v\u1edbi \u0111\u1ed9ng c\u01a1 kim lo\u1ea1i.<\/p>\n\n\n\n
Trong \u1ea5n t\u01b0\u1ee3ng c\u1ee7a m\u1ecdi ng\u01b0\u1eddi, g\u1ed1m s\u1ee9 l\u00e0 m\u1ed9t lo\u1ea1i v\u1eadt li\u1ec7u r\u1ea5t gi\u00f2n, C\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 kh\u00f4ng ng\u1eebng nghi\u00ean c\u1ee9u, cho v\u1eadt li\u1ec7u g\u1ed1m s\u1ee9 nh\u01b0 silic cacbua ch\u1eb3ng h\u1ea1n k\u1ebft h\u1ee3p v\u1edbi graphit, h\u00ecnh th\u00e0nh m\u1ed9t v\u1eadt li\u1ec7u t\u1ed5ng h\u1ee3p m\u1edbi c\u00f3 t\u00ednh ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 r\u1ea5t d\u1ebbo dai. D\u00f9ng lo\u1ea1i v\u1eadt li\u1ec7u g\u1ed1m s\u1ee9 n\u00e0y ch\u1ebf t\u1ea1o \u0111\u1ed9ng c\u01a1 \u00f4 t\u00f4 th\u00ec ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 th\u00edch \u1ee9ng v\u1edbi t\u00ecnh tr\u1ea1ng rung x\u00f3c m\u1ea1nh c\u1ee7a \u00f4 t\u00f4 khi ch\u1ea1y tr\u00ean \u0111\u01b0\u1eddng, v\u1eeba ph\u00e1t huy \u0111\u01b0\u1ee3c \u01b0u \u0111i\u1ec3m ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao c\u1ee7a g\u1ed1m s\u1ee9, l\u1ea1i duy tr\u00ec \u0111\u01b0\u1ee3c \u01b0u \u0111i\u1ec3m v\u1ec1 \u0111\u1ed9 b\u1ec1n cao v\u1ed1n c\u00f3 c\u1ee7a \u0111\u1ed9ng c\u01a1. Do \u0111\u00f3, n\u00f3 l\u00e0 m\u1ed9t lo\u1ea1i \u0111\u1ed9ng c\u01a1 ki\u1ec3u m\u1edbi r\u1ea5t c\u00f3 tri\u1ec3n v\u1ecdng.<\/p>\n\n\n\n
T\u1eeb kh\u00f3a: \u0110\u1ed9ng c\u01a1 b\u1eb1ng g\u1ed1m s\u1ee9<\/p>\n","protected":false},"excerpt":{"rendered":"
N\u0103m 1991, chi\u1ebfc \u00f4 t\u00f4 bu\u00fdt c\u1ee1 l\u1edbn \u0111\u1ea7u ti\u00ean c\u00f3 \u0111\u1ed9ng c\u01a1 \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o b\u1eb1ng g\u1ed1m s\u1ee9 \u0111\u00e3 ho\u00e0n th\u00e0nh m\u1ed9t h\u00e0nh tr\u00ecnh t\u1eeb Th\u01b0\u1ee3ng H\u1ea3i \u0111\u1ebfn B\u1eafc Kinh. Vi\u1ec7c ch\u1ea1y th\u1eed th\u00e0nh c\u00f4ng tr\u00ean m\u1ed9t kho\u1ea3ng c\u00e1ch xa nh\u01b0 v\u1eady, ch\u1ee9ng t\u1ecf vi\u1ec7c nghi\u00ean c\u1ee9u ch\u1ebf t\u1ea1o v\u00e0 \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf […]<\/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":[15,16],"tags":[],"class_list":["post-8828","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-ky-thuat"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/8828","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=8828"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/8828\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=8828"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=8828"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=8828"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}