{"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":"introduccion-al-polvo-de-alumina","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/es\/introduccion-al-polvo-de-alumina\/","title":{"rendered":"Introducci\u00f3n a las necesidades y conocimientos b\u00e1sicos del polvo de al\u00famina"},"content":{"rendered":"

Polvo de al\u00famina<\/a> (Al2O3) es un polvo amorfo blanco, perteneciente al \u00f3xido inorg\u00e1nico, insoluble en agua, soluble en \u00e1lcalis fuertes y \u00e1cidos fuertes, punto de fusi\u00f3n 2054\u00b0C, punto de ebullici\u00f3n 2980\u00b0C, con alta pureza y blancura Alta, alta especificidad, buena estabilidad t\u00e9rmica, distribuci\u00f3n uniforme del tama\u00f1o de las part\u00edculas y buena fluidez; la al\u00famina tiene muchos is\u00f3meros, y el al\u00famina en polvo<\/a> preparada mediante distintos m\u00e9todos de preparaci\u00f3n es muy diferente. Las tres formas cristalinas m\u00e1s comunes de la al\u00famina son: \u03b1-Al2O3, \u03b2-Al2O3 y \u03b3-Al2O3.<\/p>\n

(A) \u03b1-Al2O3, sistema cristalino trigonal, existe en forma de corind\u00f3n en la naturaleza, con estructura compacta, buena conductividad t\u00e9rmica, es el tipo de cristal m\u00e1s estable, y su dureza s\u00f3lo es superada por el diamante y el carburo de silicio;<\/p>\n

(B) \u03b2-Al2O3, estructura de espinela c\u00fabica, los iones de ox\u00edgeno est\u00e1n dispuestos en c\u00fabicos centrados en las caras, y los iones de aluminio rellenan los huecos. El \u03b2-Al2O3 no es una sustancia separada del Al2O3, sino un mineral polialuminado con alto contenido en al\u00famina;<\/p>\n

(C) \u03b3-Al2O3 es un intermediario de la transformaci\u00f3n de Al2O3 amorfo a \u03b1-Al2O3, y es la forma de baja temperatura de Al2O3. La estructura es suelta, la densidad es peque\u00f1a, la actividad es grande y es f\u00e1cil que absorba agua. No puede existir de forma estable a altas temperaturas y no existe en la naturaleza.<\/p>\n

La producci\u00f3n de polvo de al\u00famina ocupa una gran proporci\u00f3n de la producci\u00f3n total de polvo de cer\u00e1mica artificial en el mundo. De la demanda total de polvo de al\u00famina, m\u00e1s de 80% se destina a la fundici\u00f3n de aluminio, y el resto puede utilizarse directamente en forma de polvo de al\u00famina como materia prima para la fabricaci\u00f3n de otros productos. El polvo de al\u00famina de aplicaci\u00f3n directa se utiliza principalmente en materiales refractarios, cer\u00e1mica fina, abrasivos, etc. El polvo de al\u00famina de gran pureza se utiliza generalmente para preparar cristales artificiales, al\u00famina transparente, componentes electr\u00f3nicos de precisi\u00f3n, etc. Adem\u00e1s, los cristales artificiales tienen unos requisitos de calidad muy elevados para la al\u00famina de gran pureza, y la mayor parte de su pureza debe alcanzar los 5N. China va muy a la zaga de los pa\u00edses extranjeros en la preparaci\u00f3n de al\u00famina de gran pureza, y el polvo de calidad especialmente buena sigue dependiendo de las importaciones.<\/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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