{"id":6600,"date":"2021-04-04T11:49:44","date_gmt":"2021-04-04T11:49:44","guid":{"rendered":"https:\/\/www.aluminaceramicball.com\/?p=6600"},"modified":"2021-04-12T06:49:53","modified_gmt":"2021-04-12T06:49:53","slug":"introducao-ao-po-de-alumina","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/pt\/introducao-ao-po-de-alumina\/","title":{"rendered":"Introdu\u00e7\u00e3o \u00e0s necessidades e conhecimentos b\u00e1sicos do p\u00f3 de alumina"},"content":{"rendered":"

P\u00f3 de alumina<\/a> (Al2O3) \u00e9 um p\u00f3 branco amorfo, pertencente ao \u00f3xido inorg\u00e2nico, insol\u00favel em \u00e1gua, sol\u00favel em \u00e1lcalis fortes e \u00e1cidos fortes, ponto de fus\u00e3o 2054\u00b0C, ponto de ebuli\u00e7\u00e3o 2980\u00b0C, com alta pureza e brancura Alta, alta especificidade, boa estabilidade t\u00e9rmica, distribui\u00e7\u00e3o uniforme do tamanho das part\u00edculas e boa fluidez; a alumina tem muitos is\u00f3meros, e a p\u00f3 de alumina<\/a> A alumina preparada por diferentes m\u00e9todos de prepara\u00e7\u00e3o \u00e9 bastante diferente. As tr\u00eas formas cristalinas mais comuns da alumina s\u00e3o: \u03b1-Al2O3, \u03b2-Al2O3, e \u03b3-Al2O3.<\/p>\n

(A) \u03b1-Al2O3, sistema cristalino trigonal, existe na natureza sob a forma de corindo, com uma estrutura compacta, boa condutividade t\u00e9rmica, \u00e9 o tipo de cristal mais est\u00e1vel e a sua dureza s\u00f3 fica atr\u00e1s da do diamante e do carboneto de sil\u00edcio;<\/p>\n

(B) \u03b2-Al2O3, estrutura c\u00fabica de espin\u00e9lio, os i\u00f5es de oxig\u00e9nio est\u00e3o dispostos em c\u00fabico centrado na face e os i\u00f5es de alum\u00ednio preenchem os espa\u00e7os vazios. O \u03b2-Al2O3 n\u00e3o \u00e9 uma subst\u00e2ncia separada do Al2O3, mas um mineral polialuminoso com elevado teor de alumina;<\/p>\n

(C) \u03b3-Al2O3 \u00e9 um intermedi\u00e1rio da transforma\u00e7\u00e3o de Al2O3 amorfo em \u03b1-Al2O3, e \u00e9 a forma de baixa temperatura de Al2O3. A estrutura \u00e9 solta, a densidade \u00e9 pequena, a atividade \u00e9 grande e \u00e9 f\u00e1cil de absorver \u00e1gua. N\u00e3o pode existir de forma est\u00e1vel sob alta temperatura, e n\u00e3o existe na natureza.<\/p>\n

A produ\u00e7\u00e3o de p\u00f3 de alumina ocupa uma grande propor\u00e7\u00e3o da produ\u00e7\u00e3o total de p\u00f3 de cer\u00e2mica artificial no mundo. Da procura total de p\u00f3 de alumina, mais de 80% \u00e9 utilizado para a fundi\u00e7\u00e3o de alum\u00ednio, e o restante pode ser diretamente utilizado sob a forma de p\u00f3 de alumina como mat\u00e9ria-prima para a produ\u00e7\u00e3o de outros produtos. O p\u00f3 de alumina diretamente aplicado \u00e9 utilizado principalmente em materiais refract\u00e1rios, cer\u00e2mica fina, abrasivos, etc. O p\u00f3 de alumina de elevada pureza \u00e9 geralmente utilizado para preparar cristais artificiais, alumina transparente, componentes electr\u00f3nicos de precis\u00e3o, etc. Al\u00e9m disso, os cristais artificiais t\u00eam requisitos de qualidade muito elevados no que respeita \u00e0 alumina de elevada pureza, devendo a maior parte da sua pureza atingir 5N. A China est\u00e1 muito atrasada em rela\u00e7\u00e3o aos pa\u00edses estrangeiros no que respeita \u00e0 prepara\u00e7\u00e3o de alumina de elevada pureza e o p\u00f3 de qualidade particularmente boa continua a depender das importa\u00e7\u00f5es.<\/p>","protected":false},"excerpt":{"rendered":"

Alumina powder (Al2O3) is a white amorphous powder, belonging to inorganic oxide, insoluble in water, soluble in strong alkalis and strong acids, melting point 2054\u00b0C, boiling point 2980\u00b0C, with high purity and whiteness High, high specificity, good thermal stability, uniform particle size distribution and good fluidity; alumina has many isomers, and the alumina powder prepared […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_templately_pack_id":"","_templately_imported_at":"","_templately_source":"","_templately_import_session_id":"","site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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