Ng\u01b0\u1eddi ta th\u01b0\u1eddng n\u00f3i \u201cd\u1ec5 ch\u00e1y nh\u01b0 gi\u1ea5y” \u0111\u1ec3 ch\u1ec9 t\u00ednh d\u1ec5 ch\u00e1y c\u1ee7a gi\u1ea5y. Khi g\u1eb7p l\u1eeda, gi\u1ea5y s\u1ebd b\u1ecb ch\u00e1y thi\u00eau.<\/p>\n\n\n\n
Nh\u01b0ng l\u1ea1i c\u0169ng c\u00f3 lo\u1ea1i gi\u1ea5y c\u00f3 t\u00ednh n\u0103ng \u0111\u1eb7c bi\u1ec7t d\u00f9 c\u00f3 \u0111em \u0111\u1ed1t c\u0169ng kh\u00f4ng ch\u00e1y m\u00e0 ch\u1ec9 b\u1ecb l\u1ee5i d\u1ea7n. L\u1ea1i c\u00f3 lo\u1ea1i gi\u1ea5y khi \u0111em tr\u00f9m l\u00ean l\u00f2 l\u1eeda \u0111\u01b0\u01a1ng ch\u00e1y r\u1eebng r\u1ef1c, s\u1edd tay v\u00e0o c\u0169ng kh\u00f4ng h\u1ec1 th\u1ea5y n\u00f3ng, kh\u00f4ng g\u00e2y b\u1ecfng tay. N\u1ebfu \u0111\u1ec3 l\u00ean tr\u00ean gi\u1ea5y m\u1ed9t b\u00ecnh n\u01b0\u1edbc \u0111un m\u00e3i v\u1eabn kh\u00f4ng th\u1ea5y s\u00f4i, \u0111\u00e2y l\u00e0 lo\u1ea1i gi\u1ea5y b\u1ec1n v\u1edbi l\u1eeda, l\u1ea1i c\u00e1ch nhi\u1ec7t, c\u00f3 th\u1ec3 d\u00f9ng l\u00e0m c\u00e1c t\u1ea5m b\u00eca ch\u1ed1ng ch\u00e1y.<\/p>\n\n\n\n
Nguy\u00ean li\u1ec7u \u0111\u1ec3 s\u1ea3n xu\u1ea5t gi\u1ea5y th\u01b0\u1eddng d\u00f9ng l\u00e0 lo\u1ea1i th\u1ef1c v\u1eadt c\u00f3 s\u1ee3i. C\u00e1c lo\u1ea1i s\u1ee3i th\u1ef1c v\u1eadt l\u00e0 nh\u1eefng h\u1ee3p ch\u1ea5t h\u1eefu c\u01a1 r\u1ea5t d\u1ec5 ch\u00e1y. Lo\u1ea1i gi\u1ea5y ch\u1ecbu \u0111\u01b0\u1ee3c l\u1eeda \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t t\u1eeb s\u1ee3i ami\u0103ng, s\u1ee3i thu\u1ef7 tinh. Th\u00e0nh ph\u1ea7n ch\u1ee7 y\u1ebfu c\u1ee7a s\u1ee3i th\u1ee7y tinh l\u00e0 silic \u0111ioxit, \u0111\u00e2y l\u00e0 lo\u1ea1i h\u1ee3p ch\u1ea5t kh\u00f4ng h\u1ec1 b\u1ecb ch\u00e1y. T\u1ea5m b\u00eca c\u00e1ch nhi\u1ec7t \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t b\u1eb1ng ziriconi v\u00e0 ziriconi \u0111ioxit. C\u00e1c lo\u1ea1i s\u1ee3i n\u00e0y c\u00f3 \u0111i\u1ec3m n\u00f3ng ch\u1ea3y r\u1ea5t cao, l\u1eeda kh\u00f4ng \u0111\u1ed1t ch\u00e1y \u0111\u01b0\u1ee3c. N\u00f3i chung n\u1ebfu d\u00f9ng lo\u1ea1i gi\u1ea5y s\u1ea3n xu\u1ea5t b\u1eb1ng 100% silic \u0111ioxit c\u00f3 th\u1ec3 ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao \u0111\u1ebfn 500 – 700\u00b0C, d\u00f9ng ziriconi silicat s\u1ea3n xu\u1ea5t c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 1200 – 1300\u00b0C, c\u00f2n n\u1ebfu d\u00f9ng ziriconi \u0111ioxit th\u00ec gi\u1ea5y c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 2500\u00b0C. Do s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a ng\u00e0nh k\u1ef9 thu\u1eadt h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5, ng\u01b0\u1eddi ta s\u1eed d\u1ee5ng c\u00e1c lo\u1ea1i gi\u1ea5y n\u00e0y trong c\u00e1c t\u00ean l\u1eeda, v\u1ec7 tinh nh\u00e2n t\u1ea1o, trong c\u00e1c con t\u00e0u v\u0169 tr\u1ee5, \u0111\u1ec3 ch\u1ebf t\u1ea1o c\u00e1c h\u1ec7 th\u1ed1ng c\u00e1ch nhi\u1ec7t nhi\u1ec1u l\u1edbp, c\u00e1ch ly c\u00e1c ngu\u1ed3n nhi\u1ec7t kh\u1ecfi c\u00e1c v\u1eadt li\u1ec7u d\u1ec5 ch\u00e1y.<\/p>\n\n\n\n
Ngo\u00e0i ra khi t\u1ea9m gi\u1ea5y th\u01b0\u1eddng b\u1eb1ng c\u00e1c mu\u1ed1i photphat ho\u1eb7c halogenua c\u0169ng t\u1ea1o \u0111\u01b0\u1ee3c gi\u1ea5y c\u00e1ch nhi\u1ec7t. Ng\u01b0\u1eddi ta ng\u00e2m gi\u1ea5y ho\u1eb7c b\u00eca th\u01b0\u1eddng v\u00e0o dung d\u1ecbch ch\u1ea5t c\u00e1ch nhi\u1ec7t (mu\u1ed1i photphat ho\u1eb7c halogenua) \u0111em s\u1ea5y kh\u00f4 ta c\u0169ng thu \u0111\u01b0\u1ee3c lo\u1ea1i v\u1eadt li\u1ec7u c\u00f3 t\u00e1c d\u1ee5ng ph\u00f2ng ho\u1ea3. Khi x\u1eed l\u00fd gi\u1ea5y v\u1edbi dung d\u1ecbch este polyphotphoric th\u00ec khi g\u1eb7p l\u1eeda s\u1ebd h\u00ecnh th\u00e0nh th\u1ec3 thu\u1ef7 tinh v\u00e0 gi\u1ea5y s\u1ebd kh\u00f4ng b\u1ecb ch\u00e1y. V\u1edbi lo\u1ea1i gi\u1ea5y \u0111\u01b0\u1ee3c x\u1eed l\u00fd v\u1edbi c\u00e1c ch\u1ea5t ph\u00f2ng ho\u1ea3 ng\u01b0\u1eddi ta c\u00f3 th\u1ec3 d\u00f9ng \u0111\u1ec3 d\u00e1n t\u01b0\u1eddng c\u0169ng c\u00f3 t\u00e1c d\u1ee5ng ch\u1ed1ng ch\u00e1y v\u00e0 c\u00e1ch nhi\u1ec7t.<\/p>\n\n\n\n
V\u1edbi lo\u1ea1i gi\u1ea5y vi\u1ebft th\u01b0\u1eddng \u0111em x\u1eed l\u00fd v\u1edbi ch\u1ea5t ph\u00f2ng ho\u1ea3 c\u00f3 th\u1ec3 d\u00f9ng \u0111\u1ec3 in c\u00e1c v\u0103n ki\u1ec7n l\u01b0u tr\u1eef. \u0110\u1ec3 m\u1ed7i khi ti\u1ebfp x\u00fac v\u1edbi l\u1eeda, v\u0103n ki\u1ec7n c\u0169ng kh\u00f4ng k\u1ecbp b\u1ecb ch\u00e1y m\u1ea5t.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: Gi\u1ea5y; Gi\u1ea5y ch\u1ecbu nhi\u1ec7t.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
Ng\u01b0\u1eddi ta th\u01b0\u1eddng n\u00f3i \u201cd\u1ec5 ch\u00e1y nh\u01b0 gi\u1ea5y” \u0111\u1ec3 ch\u1ec9 t\u00ednh d\u1ec5 ch\u00e1y c\u1ee7a gi\u1ea5y. Khi g\u1eb7p l\u1eeda, gi\u1ea5y s\u1ebd b\u1ecb ch\u00e1y thi\u00eau. Nh\u01b0ng l\u1ea1i c\u0169ng c\u00f3 lo\u1ea1i gi\u1ea5y c\u00f3 t\u00ednh n\u0103ng \u0111\u1eb7c bi\u1ec7t d\u00f9 c\u00f3 \u0111em \u0111\u1ed1t c\u0169ng kh\u00f4ng ch\u00e1y m\u00e0 ch\u1ec9 b\u1ecb l\u1ee5i d\u1ea7n. L\u1ea1i c\u00f3 lo\u1ea1i gi\u1ea5y khi \u0111em tr\u00f9m l\u00ean l\u00f2 […]<\/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-7880","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\/7880","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=7880"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7880\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=7880"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=7880"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=7880"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}