{"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":"utilisations-de-la-poudre-dalumine-dans-lindustrie","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/fr\/utilisations-de-la-poudre-dalumine-dans-lindustrie\/","title":{"rendered":"Caract\u00e9ristiques et utilisations de la poudre d'alumine dans l'industrie"},"content":{"rendered":"

Les plus courants sont l'\u03b1-Al2O3 et l'\u03b3-Al2O3. Dans la nature, le corindon est constitu\u00e9 de cristaux d'\u03b1-Al2O3 de forme hexagonale. L'\u03b1-Al2O3 a un point de fusion de 2015\u00b115\u00b0C, une densit\u00e9 de 3,965g\/cm3 et une duret\u00e9 de 8,8. Il est insoluble dans l'eau, les acides et les alcalis. Le \u03b3-Al2O3 est un cristal cubique compact\u00e9, insoluble dans l'eau, mais soluble dans l'acide et l'alcali, et c'est un oxyde amphot\u00e8re typique.<\/p>\n

    \n
  1. Les principaux composants du rubis et du saphir sont l'alumine. D'autres impuret\u00e9s lui conf\u00e8rent une couleur diff\u00e9rente. Le rubis contient de l'oxyde de chrome et est rouge, tandis que le saphir contient de l'oxyde de fer et de titane et est bleu.<\/li>\n
  2. Dans la bauxite, principal composant de la bauxite, la teneur en alumine est la plus \u00e9lev\u00e9e. Industriellement, la bauxite est purifi\u00e9e en alumine par le proc\u00e9d\u00e9 Bayer, puis convertie en aluminium m\u00e9tal par le proc\u00e9d\u00e9 Hall-Heroult.<\/li>\n
  3. L'alumine est la raison pour laquelle l'aluminium m\u00e9tallique ne se corrode pas facilement \u00e0 l'air. L'aluminium m\u00e9tallique pur r\u00e9agit facilement avec l'oxyg\u00e8ne de l'air pour former une fine pellicule d'oxyde d'aluminium qui recouvre la surface de l'aluminium expos\u00e9e \u00e0 l'air. Ce film d'oxyde d'aluminium peut emp\u00eacher l'aluminium de s'oxyder davantage. L'\u00e9paisseur et les propri\u00e9t\u00e9s de ce film d'oxyde peuvent \u00eatre am\u00e9lior\u00e9es par un processus appel\u00e9 anodisation.<\/li>\n
  4. L'aluminium est un bon conducteur d'\u00e9lectricit\u00e9 et de chaleur. La forme cristalline de l'\u00e9meri d'aluminium convient aux mat\u00e9riaux abrasifs et aux outils de coupe en raison de sa grande duret\u00e9.<\/li>\n
  5. Poudre d'alumine<\/a> est souvent utilis\u00e9 comme support pour la chromatographie.<\/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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