\u0110\u1ec3 k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd c\u1ee7a b\u00f3ng \u0111\u00e8n, lo\u1ea1i tr\u1eeb hi\u1ec7n t\u01b0\u1ee3ng b\u00f3ng b\u1ecb \u0111en, ng\u01b0\u1eddi ta l\u1ea1i nghi\u00ean c\u1ee9u ti\u1ebfp, sau c\u00f9ng ch\u1ebf t\u1ea1o ra \u0111\u00e8n d\u00e2y t\u00f3c c\u00f3 n\u1ea1p i\u00f4t, n\u00f3i g\u1ecdn l\u00e0 \u0111\u00e8n i\u00f4t – vonfram. N\u00f3 kh\u00f4ng gi\u1ed1ng v\u1edbi \u0111\u00e8n d\u00e2y t\u00f3c th\u00f4ng th\u01b0\u1eddng c\u00f3 d\u1ea1ng h\u00ecnh c\u1ea7u, ngo\u1ea1i h\u00ecnh c\u1ee7a n\u00f3 c\u00f3 d\u1ea1ng h\u00ecnh \u1ed1ng. \u1ed0ng \u0111\u00e8n \u0111\u01b0\u1ee3c l\u00e0m b\u1eb1ng th\u1ea1ch anh. Th\u1ea1ch anh c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u1ef1ng \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 cao.<\/p>\n\n\n\n
Khi \u0111\u00e8n i\u00f4t – vonfram l\u00e0m vi\u1ec7c, b\u1ec1 m\u1eb7t c\u1ee7a vonfram v\u1eabn s\u1ebd x\u1ea3y ra th\u0103ng hoa nh\u01b0 v\u1eady, sinh ra h\u01a1i vonfram. Song, khi nhi\u1ec7t \u0111\u1ed9 \u1edf 250\u00b0C tr\u1edf l\u00ean, h\u01a1i vonfram c\u00f3 th\u1ec3 ho\u00e1 h\u1ee3p v\u1edbi i\u00f4t trong \u1ed1ng \u0111\u00e8n, sinh ra kh\u00ed vonfram i\u00f4tua (WI). Nh\u01b0 v\u1eady vonfram s\u1ebd kh\u00f4ng \u0111\u1ecdng l\u1ea1i tr\u00ean b\u00f3ng \u0111\u00e8n n\u1eefa. Kh\u00ed vonfram i\u00f4tua khi \u0111\u1ebfn g\u1ea7n d\u00e2y t\u00f3c c\u00f3 nhi\u1ec7t \u0111\u1ed9 c\u1ef1c cao (tr\u00ean 1400\u00b0C), l\u1ea1i l\u1eadp t\u1ee9c ph\u00e2n li th\u00e0nh i\u00f4t v\u00e0 vonfram. Th\u1ebf l\u00e0 vonfram \u0111\u00e3th\u0103ng hoa l\u1ea1i \u0111\u01b0\u1ee3c tr\u1ea3 v\u1ec1 cho d\u00e2y t\u00f3c. I\u00f4t trong \u1ed1ng \u0111\u00e8n kh\u00f4ng ng\u1eebng \u0111\u01b0a vonfram th\u0103ng hoa t\u1eeb d\u00e2y t\u00f3c tr\u1edf v\u1ec1 ch\u1ed7 c\u0169, k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd c\u1ee7a \u0111\u00e8n. \u0110\u1ec3 b\u1ea3o \u0111\u1ea3m cho vonfram v\u00e0 i\u00f4t c\u00f3 th\u1ec3 ho\u00e0 h\u1ee3p, nhi\u1ec7t \u0111\u1ed9 trong \u0111\u00e8n kh\u00f4ng \u0111\u01b0\u1ee3c xu\u1ed1ng th\u1ea5p d\u01b0\u1edbi 250\u00b0C. V\u00ec v\u1eady, \u1ed1ng \u0111\u00e8n c\u1ee7a \u0111\u00e8n i\u00f4t – vonfram kh\u00f4ng th\u1ec3 l\u1edbn, k\u1ebft c\u1ea5u bao gi\u1edd c\u0169ng r\u1ea5t g\u1ecdn nh\u1ecf.<\/p>\n\n\n\n
\u0110\u00e8n i\u00f4t – vonfram kh\u00f4ng nh\u1eefng th\u1ec3 t\u00edch nh\u1ecf, m\u00e0 c\u00f2n c\u00f3 i\u00f4t l\u00e0m “l\u00ednh v\u1eadn t\u1ea3i”, nhi\u1ec7t \u0111\u1ed9 c\u1ee7a d\u00e2y t\u00f3c c\u0169ng c\u00f3 th\u1ec3 n\u00e2ng cao l\u00ean. C\u00e1i \u0111\u00f3 l\u00e0m cho hi\u1ec7u su\u1ea5t ph\u00e1t s\u00e1ng v\u00e0 \u0111\u1ed9 ch\u00f3i \u0111\u1ec1u \u0111\u01b0\u1ee3c n\u00e2ng cao.<\/p>\n\n\n\n
C\u00f4ng d\u1ee5ng c\u1ee7a \u0111\u00e8n i\u00f4t – vonfram r\u1ea5t r\u1ed9ng r\u00e3i. Ngo\u00e0i vi\u1ec7c c\u00f3 th\u1ec3 d\u00f9ng \u0111\u1ec3 chi\u1ebfu s\u00e1ng \u0111\u01b0\u1eddng b\u0103ng s\u00e2n bay, s\u00e2n b\u00f3ng, qu\u1ea3ng tr\u01b0\u1eddng, x\u01b0\u1edfng m\u00e1y, \u0111\u01b0\u1eddng ph\u1ed1, nh\u00e0 h\u00e1t ra, c\u00f2n c\u00f3 th\u1ec3 d\u00f9ng cho chi\u1ebfu b\u00f3ng, ch\u1ee5p \u1ea3nh v.v., v\u1eeba nh\u1eb9 nh\u00e0ng, v\u1eeba an to\u00e0n, hi\u1ec7u qu\u1ea3 l\u1ea1i cao. Do \u0111\u00e8n i\u00f4t – vonfram sinh ra b\u1ee9c x\u1ea1 t\u1eed ngo\u1ea1i nhi\u1ec1u h\u01a1n \u0111\u00e8n d\u00e2y t\u00f3c th\u00f4ng th\u01b0\u1eddng, khi v\u1eadt th\u1ec3 \u0111\u01b0\u1ee3c chi\u1ebfu s\u00e1ng m\u1eabn c\u1ea3m \u0111\u1ed1i v\u1edbi tia t\u1eed ngo\u1ea1i, ph\u1ea3i quan t\u00e2m ch\u00fa \u00fd nhi\u1ec1u h\u01a1n. N\u1ebfu d\u00f9ng brom n\u1ea1p v\u00e0o \u1ed1ng \u0111\u00e8n thay cho i\u00f4t th\u00ec c\u00f3 th\u1ec3 ch\u1ebf th\u00e0nh \u0111\u00e8n brom – vonfram. Nguy\u00ean l\u00ed l\u00e0m vi\u1ec7c c\u1ee7a \u0111\u00e8n brom – vonfram c\u0169ng gi\u1ed1ng nh\u01b0 \u0111\u00e8n i\u00f4t – vonfram. Do i\u00f4t v\u00e0 brom \u0111\u1ec1u l\u00e0 nguy\u00ean t\u1ed1 halogen, cho n\u00ean \u0111\u00e8n i\u00f4t – vonfram v\u00e0 \u0111\u00e8n brom – vonfram \u0111\u1ec1u \u0111\u01b0\u1ee3c g\u1ecdi chung l\u00e0 \u0111\u00e8n vonfram – halogen.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: \u0110\u00e8n d\u00e2y t\u00f3c; \u0110\u00e8n i\u00f4t-vofram; \u0110\u00e8n brom-vonfram; Th\u0103ng hoa.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
\u0110\u1ec3 k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd c\u1ee7a b\u00f3ng \u0111\u00e8n, lo\u1ea1i tr\u1eeb hi\u1ec7n t\u01b0\u1ee3ng b\u00f3ng b\u1ecb \u0111en, ng\u01b0\u1eddi ta l\u1ea1i nghi\u00ean c\u1ee9u ti\u1ebfp, sau c\u00f9ng ch\u1ebf t\u1ea1o ra \u0111\u00e8n d\u00e2y t\u00f3c c\u00f3 n\u1ea1p i\u00f4t, n\u00f3i g\u1ecdn l\u00e0 \u0111\u00e8n i\u00f4t – vonfram. N\u00f3 kh\u00f4ng gi\u1ed1ng v\u1edbi \u0111\u00e8n d\u00e2y t\u00f3c th\u00f4ng th\u01b0\u1eddng c\u00f3 d\u1ea1ng h\u00ecnh c\u1ea7u, ngo\u1ea1i h\u00ecnh c\u1ee7a […]<\/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":[15,7],"tags":[],"class_list":["post-5726","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-vat-ly"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5726","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=5726"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5726\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=5726"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=5726"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=5726"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}