{"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":"verwendung-von-tonerdepulver-in-der-industrie","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/de\/verwendung-von-tonerdepulver-in-der-industrie\/","title":{"rendered":"Eigenschaften und Verwendung von Aluminiumoxidpulver in der Industrie"},"content":{"rendered":"

Die h\u00e4ufigsten sind \u03b1-Al2O3 und \u03b3-Al2O3. In der Natur besteht Korund aus \u03b1-Al2O3, hexagonalen, dicht gepackten Kristallen. \u03b1-Al2O3 hat einen Schmelzpunkt von 2015\u00b115\u00b0C, eine Dichte von 3,965g\/cm3 und eine H\u00e4rte von 8,8. Es ist unl\u00f6slich in Wasser, S\u00e4uren und Laugen. \u03b3-Al2O3 ist ein kubischer, dicht gepackter Kristall, unl\u00f6slich in Wasser, aber l\u00f6slich in S\u00e4uren und Laugen, und ist ein typisches amphoteres Oxid.<\/p>\n

    \n
  1. Die Hauptbestandteile von Rubin und Saphir sind Tonerde. Aufgrund anderer Verunreinigungen weist er eine andere Farbe auf. Rubin enth\u00e4lt Chromoxid und ist rot, w\u00e4hrend Saphir Eisenoxid und Titanoxid enth\u00e4lt und blau ist.<\/li>\n
  2. Im Hauptbestandteil Bauxit ist der Gehalt an Tonerde am h\u00f6chsten. In der Industrie wird Bauxit nach dem Bayer-Verfahren zu Tonerde gereinigt und anschlie\u00dfend nach dem Hall-Heroult-Verfahren in Aluminiummetall umgewandelt.<\/li>\n
  3. Tonerde ist der Grund daf\u00fcr, dass metallisches Aluminium an der Luft nicht so leicht korrodiert. Reines metallisches Aluminium reagiert leicht mit dem Sauerstoff in der Luft und bildet eine d\u00fcnne Aluminiumoxidschicht, die die Oberfl\u00e4che von Aluminium an der Luft bedeckt. Diese Aluminiumoxidschicht kann verhindern, dass das Aluminium weiter oxidiert wird. Die Dicke und die Eigenschaften dieser Oxidschicht k\u00f6nnen durch ein Verfahren namens Eloxieren verbessert werden.<\/li>\n
  4. Aluminium ist ein guter Leiter von Elektrizit\u00e4t und W\u00e4rme. Die Kristallform von Aluminiumschmirgel eignet sich aufgrund seiner hohen H\u00e4rte f\u00fcr Schleifmittel und Schneidwerkzeuge.<\/li>\n
  5. Tonerdepulver<\/a> wird h\u00e4ufig als Medium f\u00fcr die Chromatographie verwendet.<\/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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