silica<\/a>, silicat kim lo\u1ea1i v\u00e0 oxit kim lo\u1ea1i ki\u1ec1m) ph\u1ea3i nh\u1ecf h\u01a1n 0,1 wt%, v\u00ec s\u1ef1 ph\u00e2n h\u1ee7y c\u1ee7a c\u00e1c t\u1ea1p ch\u1ea5t nh\u01b0 v\u1eady s\u1ebd d\u1eabn \u0111\u1ebfn c\u00e1c v\u1ecb tr\u00ed t\u1eadp trung \u1ee9ng su\u1ea5t, n\u01a1i c\u00e1c v\u1ebft n\u1ee9t s\u1ebd xu\u1ea5t hi\u1ec7n. C\u00e1c nghi\u00ean c\u1ee9u \u0111\u00e3 ph\u00e1t hi\u1ec7n ra r\u1eb1ng b\u1eb1ng c\u00e1ch l\u1ef1a ch\u1ecdn c\u00e1c th\u00f4ng s\u1ed1 thi\u00eau k\u1ebft th\u00edch h\u1ee3p (nhi\u1ec7t \u0111\u1ed9, th\u1eddi gian, t\u1ed1c \u0111\u1ed9 gia nhi\u1ec7t\/l\u00e0m ngu\u1ed9i) v\u00e0 c\u00e1c ch\u1ea5t ph\u1ee5 gia pha t\u1ea1p (nh\u01b0 magi\u00ea oxit, zirconi oxit v\u00e0 crom oxit), c\u00f3 th\u1ec3 ki\u1ec3m so\u00e1t \u0111\u01b0\u1ee3c k\u00edch th\u01b0\u1edbc h\u1ea1t v\u00e0 \u0111\u1ed9 x\u1ed1p c\u1ee7a Alumina, \u0111\u1ed3ng th\u1eddi c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u qu\u1ea3 \u0111\u1ed9 dai v\u00e0 \u0111\u1ed9 b\u1ec1n g\u00e3y c\u1ee7a Alumina.<\/p>\nV\u1eadt li\u1ec7u composite \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh t\u1eeb Zirconi oxit v\u00e0 Alumina \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 Zirconi oxit c\u01b0\u1eddng l\u1ef1c Alumina (ZTA) ho\u1eb7c Alumina c\u01b0\u1eddng l\u1ef1c Alumina (ATZ), c\u0169ng \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong v\u1eadt li\u1ec7u kh\u1edbp nh\u00e2n t\u1ea1o. Hai v\u1eadt li\u1ec7u composite n\u00e0y ph\u1ee5 thu\u1ed9c v\u00e0o h\u00e0m l\u01b0\u1ee3ng c\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh. C\u00e1c v\u1eadt li\u1ec7u composite n\u00e0y k\u1ebft h\u1ee3p kh\u1ea3 n\u0103ng l\u00e0m c\u1ee9ng c\u1ee7a zirconium oxide v\u1edbi \u0111\u1ed9 nh\u1ea1y th\u1ea5p c\u1ee7a alumina \u0111\u1ed1i v\u1edbi s\u1ef1 ph\u00e2n h\u1ee7y trong ch\u1ea5t l\u1ecfng sinh h\u1ecdc \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p. Theo y\u00eau c\u1ea7u thi\u1ebft k\u1ebf c\u1ee7a v\u1eadt li\u1ec7u, ATZ c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng khi c\u1ea7n \u0111\u1ed9 b\u1ec1n g\u00e3y cao, trong khi ZTA c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng khi c\u1ea7n \u0111\u1ed9 c\u1ee9ng. Kh\u00f4ng c\u00f3 \u0111\u1ee7 d\u1eef li\u1ec7u l\u00e2m s\u00e0ng \u0111\u1ec3 ch\u1ee9ng minh r\u1eb1ng b\u1ec1 m\u1eb7t ch\u1ecbu l\u1ef1c kh\u1edbp ZTA c\u00f3 \u01b0u \u0111i\u1ec3m l\u1edbn h\u01a1n v\u1ec1 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n. C\u00e1c nghi\u00ean c\u1ee9u \u0111\u00e3 ch\u1ec9 ra r\u1eb1ng \u1ee9ng d\u1ee5ng c\u1ee7a ZTA v\u00e0 alumina c\u01b0\u1eddng l\u1ef1c g\u1ed1c zirconium oxide (ZPTA) trong ph\u1eabu thu\u1eadt kh\u1edbp l\u1edbn h\u01a1n nhi\u1ec1u so v\u1edbi ATZ.<\/p>\n
\u1ee8ng d\u1ee5ng c\u1ee7a g\u1ed1m s\u1ee9 alumina trong ph\u1ee5c h\u00ecnh r\u0103ng mi\u1ec7ng<\/p>\n
G\u1ed1m s\u1ee9 alumina c\u00f3 \u0111\u1ed9 truy\u1ec1n s\u00e1ng v\u00e0 m\u00e0u s\u1eafc gi\u1ed1ng v\u1edbi r\u0103ng th\u1eadt v\u00e0 h\u01a1i \u0111\u1ed9c. G\u1ed1m s\u1ee9 alumina c\u00f3 \u0111\u1ed9 d\u1eabn nhi\u1ec7t th\u1ea5p \u0111\u00e1ng k\u1ec3, gi\u00fap gi\u1ea3m k\u00edch th\u00edch c\u1ee7a th\u1ee9c \u0103n n\u00f3ng v\u00e0 l\u1ea1nh l\u00ean t\u1ee7y. G\u1ed1m s\u1ee9 zirconia c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n, \u0103n m\u00f2n v\u00e0 nhi\u1ec7t \u0111\u1ed9 cao, m\u00e0u s\u1eafc c\u1ee7a ch\u00fang t\u01b0\u01a1ng t\u1ef1 nh\u01b0 r\u0103ng th\u1eadt. Ch\u00fang ph\u00f9 h\u1ee3p \u0111\u1ec3 ph\u1ee5c h\u00ecnh r\u0103ng v\u00e0 c\u00f3 \u0111\u1ed9 b\u1ec1n cao. Theo th\u00e0nh ph\u1ea7n v\u1eadt l\u00fd c\u1ee7a v\u1eadt li\u1ec7u g\u1ed1m alumina v\u00e0 c\u00e1c quy tr\u00ecnh s\u1ea3n xu\u1ea5t kh\u00e1c nhau, g\u1ed1m alumina \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong l\u0129nh v\u1ef1c ph\u1ee5c h\u1ed3i to\u00e0n b\u1ed9 b\u1eb1ng g\u1ed1m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chia th\u00e0nh c\u00e1c lo\u1ea1i sau:<\/p>\n
(1) G\u1ed1m alumina th\u1ea5m th\u1ee7y tinh<\/p>\n
Th\u1ea9m th\u1ea5u th\u1ee7y tinh, t\u00ean \u0111\u1ea7y \u0111\u1ee7 l\u00e0 ph\u01b0\u01a1ng ph\u00e1p th\u1ea5m th\u1ee7y tinh ph\u1ee7 b\u00f9n. Alumina, l\u00e0 v\u1eadt li\u1ec7u n\u1ec1n, c\u00f3 c\u1ea5u tr\u00fac x\u1ed1p v\u00e0 th\u1ee7y tinh ch\u1ee9a ch\u1ea5t t\u1ea1o m\u00e0u lanthanum-borosilicate th\u1ea5m v\u00e0o trong. Sau khi t\u1ea1o h\u00ecnh, n\u00f3 c\u00f3 c\u1ea5u tr\u00fac vi m\u00f4 trong \u0111\u00f3 c\u00e1c pha tinh th\u1ec3 alumina v\u00e0 pha tinh th\u1ec3 th\u1ee7y tinh \u0111an xen v\u00e0o nhau.<\/p>\n
(2) G\u1ed1m alumina to\u00e0n ph\u1ea7n thi\u00eau k\u1ebft \u0111\u1eb7c c\u00f3 \u0111\u1ed9 tinh khi\u1ebft cao<\/p>\n
N\u00f3 bao g\u1ed3m alumina c\u00f3 \u0111\u1ed9 tinh khi\u1ebft 99,9%. B\u1ed9t alumina \u0111\u01b0\u1ee3c \u00e9p th\u00e0nh kh\u1ed1i xanh (\u00e9p kh\u00f4) d\u01b0\u1edbi \u00e1p su\u1ea5t l\u1edbn r\u1ed3i thi\u00eau k\u1ebft. Ph\u01b0\u01a1ng ph\u00e1p t\u1ea1o h\u00ecnh b\u1eb1ng \u00e1p su\u1ea5t t\u1ea1o cho g\u1ed1m alumina c\u00f3 m\u1eadt \u0111\u1ed9 cao v\u00e0 \u0111\u1ed9 x\u1ed1p th\u1ea5p.<\/p>\n
(3) G\u1ed1m s\u1ee9 alumina c\u01b0\u1eddng l\u1ef1c zirconia th\u1ea5m th\u1ee7y tinh<\/p>\n
Lo\u1ea1i g\u1ed1m n\u00e0y \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh b\u1eb1ng c\u00e1ch th\u00eam 35% zirconia \u1ed5n \u0111\u1ecbnh m\u1ed9t ph\u1ea7n v\u00e0o b\u1ed9t g\u1ed1m alumina th\u1ea5m th\u1ee7y tinh. C\u00f3 th\u1ec3 quan s\u00e1t th\u1ea5y zirconia t\u1ee9 gi\u00e1c ph\u00e2n b\u1ed1 \u0111\u1ec1u b\u00ean trong v\u1eadt li\u1ec7u \u0111\u00e3 h\u00ecnh th\u00e0nh.<\/p>\n
V\u1edbi s\u1ef1 ph\u00e1t tri\u1ec3n li\u00ean t\u1ee5c c\u1ee7a khoa h\u1ecdc v\u00e0 c\u00f4ng ngh\u1ec7, v\u1eadt li\u1ec7u g\u1ed1m sinh h\u1ecdc alumina \u0111ang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ng\u00e0y c\u00e0ng r\u1ed9ng r\u00e3i trong l\u0129nh v\u1ef1c y t\u1ebf v\u00e0 nghi\u00ean c\u1ee9u v\u1ec1 ch\u00fang s\u1ebd h\u01b0\u1edbng t\u1edbi c\u00e1c h\u01b0\u1edbng y t\u1ebf m\u1edbi n\u1ed5i c\u00f3 gi\u00e1 tr\u1ecb gia t\u0103ng cao h\u01a1n v\u00e0 nhi\u1ec1u tri\u1ec3n v\u1ecdng h\u01a1n.<\/p>\n","protected":false},"excerpt":{"rendered":"
G\u1ed1m alumina c\u00f3 \u0111\u1ed9 tinh khi\u1ebft cao c\u00f3 h\u1ec7 s\u1ed1 ma s\u00e1t r\u1ea5t th\u1ea5p, \u0111\u1ed9 c\u1ee9ng cao v\u00e0 kh\u1ea3 n\u0103ng th\u1ea5m \u01b0\u1edbt t\u1ed1t, khi\u1ebfn ch\u00fang r\u1ea5t th\u00edch h\u1ee3p \u0111\u1ec3 s\u1eed d\u1ee5ng l\u00e0m b\u1ec1 m\u1eb7t ma s\u00e1t m\u1ed1i n\u1ed1i.<\/p>\n","protected":false},"author":7,"featured_media":134114,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[852],"tags":[],"class_list":["post-134150","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cong-nghiep-tin-tuc-vi"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.alpapowder.com\/vi\/wp-json\/wp\/v2\/posts\/134150"}],"collection":[{"href":"https:\/\/www.alpapowder.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.alpapowder.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.alpapowder.com\/vi\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/www.alpapowder.com\/vi\/wp-json\/wp\/v2\/comments?post=134150"}],"version-history":[{"count":1,"href":"https:\/\/www.alpapowder.com\/vi\/wp-json\/wp\/v2\/posts\/134150\/revisions"}],"predecessor-version":[{"id":134151,"href":"https:\/\/www.alpapowder.com\/vi\/wp-json\/wp\/v2\/posts\/134150\/revisions\/134151"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.alpapowder.com\/vi\/wp-json\/wp\/v2\/media\/134114"}],"wp:attachment":[{"href":"https:\/\/www.alpapowder.com\/vi\/wp-json\/wp\/v2\/media?parent=134150"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.alpapowder.com\/vi\/wp-json\/wp\/v2\/categories?post=134150"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.alpapowder.com\/vi\/wp-json\/wp\/v2\/tags?post=134150"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}