{"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":"einfuhrung-in-das-tonerdepulver","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/de\/einfuhrung-in-das-tonerdepulver\/","title":{"rendered":"Einf\u00fchrung in den Bedarf und die Grundkenntnisse \u00fcber Tonerdepulver"},"content":{"rendered":"

Tonerdepulver<\/a> (Al2O3) ist ein wei\u00dfes amorphes Pulver, das zu den anorganischen Oxiden geh\u00f6rt, unl\u00f6slich in Wasser, l\u00f6slich in starken Laugen und starken S\u00e4uren, Schmelzpunkt 2054\u00b0C, Siedepunkt 2980\u00b0C, mit hoher Reinheit und Wei\u00dfgrad, hoher Spezifit\u00e4t, guter thermischer Stabilit\u00e4t, gleichm\u00e4\u00dfiger Partikelgr\u00f6\u00dfenverteilung und guter Flie\u00dff\u00e4higkeit; Tonerde hat viele Isomere, und die Tonerdepulver<\/a> durch verschiedene Pr\u00e4parationsmethoden hergestellt wird, ist recht unterschiedlich. Die drei h\u00e4ufigsten Kristallformen von Tonerde sind: \u03b1-Al2O3, \u03b2-Al2O3 und \u03b3-Al2O3.<\/p>\n

(A) \u03b1-Al2O3, trigonales Kristallsystem, kommt in der Natur in Form von Korund vor, hat eine kompakte Struktur, eine gute W\u00e4rmeleitf\u00e4higkeit, ist der stabilste Kristalltyp und seine H\u00e4rte ist die zweith\u00f6chste nach Diamant und Siliziumkarbid;<\/p>\n

(B) \u03b2-Al2O3, kubische Spinellstruktur, Sauerstoffionen sind kubisch fl\u00e4chenzentriert angeordnet, und Aluminiumionen f\u00fcllen die Zwischenr\u00e4ume. \u03b2-Al2O3 ist keine eigenst\u00e4ndige Substanz von Al2O3, sondern ein Polyaluminatmineral mit hohem Tonerdegehalt;<\/p>\n

(C) \u03b3-Al2O3 ist ein Zwischenprodukt der Umwandlung von amorphem Al2O3 in \u03b1-Al2O3 und ist die Niedrigtemperaturform von Al2O3. Die Struktur ist locker, die Dichte ist gering, die Aktivit\u00e4t ist gro\u00df und es kann leicht Wasser absorbieren. Es kann bei hohen Temperaturen nicht stabil existieren und kommt in der Natur nicht vor.<\/p>\n

Die Produktion von Tonerdepulver macht einen gro\u00dfen Teil der Gesamtproduktion von k\u00fcnstlichem Keramikpulver in der Welt aus. Von der Gesamtnachfrage nach Tonerdepulver werden mehr als 80% f\u00fcr die Aluminiumverh\u00fcttung verwendet, und der Rest kann direkt in Form von Tonerdepulver als Rohstoff f\u00fcr die Herstellung anderer Produkte genutzt werden. Das direkt verwendete Aluminiumoxidpulver wird haupts\u00e4chlich in feuerfesten Materialien, Feinkeramik, Schleifmitteln usw. verwendet. Hochreines Aluminiumoxidpulver wird im Allgemeinen zur Herstellung von k\u00fcnstlichen Kristallen, transparentem Aluminiumoxid, elektronischen Pr\u00e4zisionsbauteilen usw. verwendet. Dar\u00fcber hinaus stellen k\u00fcnstliche Kristalle sehr hohe Qualit\u00e4tsanforderungen an hochreines Aluminiumoxid, und die meisten von ihnen m\u00fcssen einen Reinheitsgrad von 5N erreichen. China liegt bei der Herstellung von hochreinem Aluminiumoxid weit hinter dem Ausland zur\u00fcck, und das Pulver mit besonders guter Qualit\u00e4t ist immer noch auf Importe angewiesen.<\/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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