{"id":6604,"date":"2021-04-04T12:03:07","date_gmt":"2021-04-04T12:03:07","guid":{"rendered":"https:\/\/www.aluminaceramicball.com\/?p=6604"},"modified":"2023-05-13T14:53:37","modified_gmt":"2023-05-13T14:53:37","slug":"utilizacoes-do-po-de-alumina-na-industria","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/pt\/utilizacoes-do-po-de-alumina-na-industria\/","title":{"rendered":"Carater\u00edsticas e utiliza\u00e7\u00f5es do p\u00f3 de alumina na ind\u00fastria"},"content":{"rendered":"

Os mais comuns s\u00e3o o \u03b1-Al2O3 e o \u03b3-Al2O3. O \u03b1-Al2O3 tem um ponto de fus\u00e3o de 2015\u00b115\u00b0C, uma densidade de 3,965g\/cm3 e uma dureza de 8,8. \u00c9 insol\u00favel em \u00e1gua, \u00e1cido ou alcalino. O \u03b3-Al2O3 \u00e9 um cristal c\u00fabico de empacotamento fechado, insol\u00favel em \u00e1gua, mas sol\u00favel em \u00e1cido e \u00e1lcali, e \u00e9 um \u00f3xido anfot\u00e9rico t\u00edpico.<\/p>\n

    \n
  1. Os principais componentes do rubi e da safira s\u00e3o a alumina. Apresenta uma cor diferente devido a outras impurezas. O rubi cont\u00e9m \u00f3xido de cr\u00f3mio e \u00e9 vermelho, enquanto a safira cont\u00e9m \u00f3xido de ferro e \u00f3xido de tit\u00e2nio e \u00e9 azul.<\/li>\n
  2. No principal componente da bauxite, o teor de alumina \u00e9 o mais elevado. Industrialmente, a bauxite \u00e9 purificada em alumina pelo processo Bayer, sendo depois convertida em alum\u00ednio met\u00e1lico pelo processo Hall-Heroult.<\/li>\n
  3. A alumina \u00e9 a raz\u00e3o pela qual o alum\u00ednio met\u00e1lico n\u00e3o \u00e9 facilmente corro\u00eddo pelo ar. O alum\u00ednio met\u00e1lico puro reage facilmente com o oxig\u00e9nio do ar, formando uma fina pel\u00edcula de \u00f3xido de alum\u00ednio que cobre a superf\u00edcie do alum\u00ednio exposto ao ar. Esta pel\u00edcula de \u00f3xido de alum\u00ednio pode impedir que o alum\u00ednio seja oxidado ainda mais. A espessura e as propriedades desta pel\u00edcula de \u00f3xido podem ser melhoradas atrav\u00e9s de um processo chamado anodiza\u00e7\u00e3o.<\/li>\n
  4. O alum\u00ednio \u00e9 um bom condutor de eletricidade e calor. A forma cristalina do esmeril de alum\u00ednio \u00e9 adequada para materiais abrasivos e ferramentas de corte devido \u00e0 sua elevada dureza.<\/li>\n
  5. P\u00f3 de alumina<\/a> \u00e9 frequentemente utilizado como meio de cromatografia.<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"

    The common ones are \u03b1-Al2O3 and \u03b3-Al2O3. Corundum in nature is \u03b1-Al2O3, hexagonal close-packed crystals. \u03b1-Al2O3 has a melting point of 2015\u00b115\u00b0C, a density of 3.965g\/cm3, and a hardness of 8.8. It is insoluble in water, acid or alkali. \u03b3-Al2O3 is a cubic close-packed crystal, insoluble in water, but soluble in acid and alkali, and […]<\/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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