{"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":"introduction-a-la-poudre-dalumine","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/fr\/introduction-a-la-poudre-dalumine\/","title":{"rendered":"Introduction aux besoins et aux connaissances de base de la poudre d'alumine"},"content":{"rendered":"

Poudre d'alumine<\/a> (Al2O3) est une poudre amorphe blanche, appartenant aux oxydes inorganiques, insoluble dans l'eau, soluble dans les alcalis forts et les acides forts, point de fusion 2054\u00b0C, point d'\u00e9bullition 2980\u00b0C, avec une puret\u00e9 et une blancheur \u00e9lev\u00e9es, une sp\u00e9cificit\u00e9 \u00e9lev\u00e9e, une bonne stabilit\u00e9 thermique, une distribution uniforme de la taille des particules et une bonne fluidit\u00e9 ; l'alumine a de nombreux isom\u00e8res, et le point d'\u00e9bullition de l'alumine est le m\u00eame que celui de l'alumine. poudre d'alumine<\/a> Les formes cristallines de l'alumine sont tr\u00e8s diff\u00e9rentes selon les m\u00e9thodes de pr\u00e9paration. Les trois formes cristallines les plus courantes de l'alumine sont : \u03b1-Al2O3, \u03b2-Al2O3 et \u03b3-Al2O3.<\/p>\n

(A) \u03b1-Al2O3, syst\u00e8me cristallin trigonal, existe sous forme de corindon dans la nature, avec une structure compacte, une bonne conductivit\u00e9 thermique, est le type de cristal le plus stable, et sa duret\u00e9 est la deuxi\u00e8me apr\u00e8s celle du diamant et du carbure de silicium ;<\/p>\n

(B) \u03b2-Al2O3, structure spinelle cubique, les ions d'oxyg\u00e8ne sont dispos\u00e9s en cubes \u00e0 faces centr\u00e9es et les ions d'aluminium remplissent les espaces. Le \u03b2-Al2O3 n'est pas une substance distincte de l'Al2O3, mais un min\u00e9ral polyaluminate \u00e0 forte teneur en alumine ;<\/p>\n

(C) Le \u03b3-Al2O3 est un interm\u00e9diaire de la transformation de l'Al2O3 amorphe en \u03b1-Al2O3, et constitue la forme d'Al2O3 \u00e0 basse temp\u00e9rature. Sa structure est l\u00e2che, sa densit\u00e9 est faible, son activit\u00e9 est importante et il absorbe facilement l'eau. Il ne peut exister de mani\u00e8re stable \u00e0 haute temp\u00e9rature et n'existe pas dans la nature.<\/p>\n

La production de poudre d'alumine repr\u00e9sente une grande partie de la production totale de poudre de c\u00e9ramique artificielle dans le monde. Sur la demande totale de poudre d'alumine, plus de 80% sont utilis\u00e9s pour la fusion de l'aluminium, et le reste peut \u00eatre directement utilis\u00e9 sous forme de poudre d'alumine comme mati\u00e8re premi\u00e8re pour la production d'autres produits. La poudre d'alumine directement utilis\u00e9e est principalement employ\u00e9e dans les mat\u00e9riaux r\u00e9fractaires, les c\u00e9ramiques fines, les abrasifs, etc. La poudre d'alumine de haute puret\u00e9 est g\u00e9n\u00e9ralement utilis\u00e9e pour pr\u00e9parer des cristaux artificiels, de l'alumine transparente, des composants \u00e9lectroniques de pr\u00e9cision, etc. En outre, les cristaux artificiels ont des exigences de qualit\u00e9 tr\u00e8s \u00e9lev\u00e9es en mati\u00e8re d'alumine de haute puret\u00e9, et la plupart d'entre eux doivent atteindre une puret\u00e9 de 5N. La Chine est tr\u00e8s en retard par rapport aux pays \u00e9trangers en ce qui concerne la pr\u00e9paration d'alumine de haute puret\u00e9, et la poudre de tr\u00e8s bonne qualit\u00e9 d\u00e9pend encore des importations.<\/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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