{"id":6646,"date":"2021-04-04T13:05:18","date_gmt":"2021-04-04T13:05:18","guid":{"rendered":"https:\/\/www.aluminaceramicball.com\/?p=6646"},"modified":"2021-04-12T06:47:20","modified_gmt":"2021-04-12T06:47:20","slug":"quelles-sont-les-formes-cristallines-de-la-poudre-dalumine","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/fr\/quelles-sont-les-formes-cristallines-de-la-poudre-dalumine\/","title":{"rendered":"Quelles sont les formes cristallines de la poudre d'alumine ?"},"content":{"rendered":"<p>Les formes cristallines des <a href=\"\/fr\/produit\/poudre-de-ceramique-dalumine\/\" target=\"_blank\" rel=\"noopener\">Al2O3<\/a> sont : \u03b1, \u03b3, \u03b7, \u03b4, \u03b8, \u03ba, \u03c7, etc. Lorsque les conditions ext\u00e9rieures changent, la forme cristalline change. Dans la variante Al2O3, l'oxyg\u00e8ne de l'\u03b1-Al2O3 (densit\u00e9 3,99g\/cm3) \u00e9tant le plus compact, seul l'\u03b1-Al2O3 (corindon) est stable, les autres formes cristallines \u00e9tant instables. Transform\u00e9 en \u03b1-Al2O3. Outre le corindon, le type de cristal Al2O3 commun devrait \u00eatre le \u03b3-Al2O3. Le \u03b3-Al2O3 a une structure de spinelle, mais dans sa structure, certains vides t\u00e9tra\u00e9driques ne sont pas remplis, de sorte que la densit\u00e9 du \u03b3-Al2O3 (3,65g\/ cm3) est inf\u00e9rieure \u00e0 celle du corindon. Lorsque l'Al(OH)3 est chauff\u00e9 pour la d\u00e9shydratation, le \u03b3-Al2O3 se forme \u00e0 environ 450\u00b0C, et le \u03b3-Al2O3 est chauff\u00e9 \u00e0 une temp\u00e9rature plus \u00e9lev\u00e9e pour se transformer en corindon. Toutefois, la vitesse de conversion est plus rapide lorsque le changement est sup\u00e9rieur \u00e0 1000\u00b0C.<\/p>\n<p>D'autres formes cristallines instables d'alumine sont \u00e9galement form\u00e9es dans diff\u00e9rentes conditions lorsque Al(OH)3 est chauff\u00e9 et d\u00e9shydrat\u00e9. \u03c1-Al2O3 est amorphe, mais certaines personnes pensent qu'il s'agit d'un \u00e9tat de transition entre l'amorphe et le cristallin. Comme le \u03c1-Al2O3 est la seule forme d'Al2O3 qui peut s'hydrater spontan\u00e9ment \u00e0 temp\u00e9rature ambiante, il peut \u00eatre utilis\u00e9 comme agent de cimentation pour les mat\u00e9riaux moul\u00e9s r\u00e9fractaires, ce qui explique l'int\u00e9r\u00eat qu'il a suscit\u00e9 ces derni\u00e8res ann\u00e9es.<\/p>","protected":false},"excerpt":{"rendered":"<p>The crystal forms of Al2O3 are: \u03b1, \u03b3, \u03b7, \u03b4, \u03b8, \u03ba, \u03c7 and so on. When the external conditions change, the crystal form will change. In the Al2O3 variant, since the oxygen in \u03b1-Al2O3 (density 3.99g\/cm3) is the most compactly packed, only \u03b1-Al2O3 (corundum) is stable, and other crystal forms are unstable. Transformed into [&hellip;]<\/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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[137],"tags":[464],"class_list":["post-6646","post","type-post","status-publish","format-standard","hentry","category-alumina-powder","tag-alumina-powder-tech-service"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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