{"id":6656,"date":"2021-04-04T13:26:48","date_gmt":"2021-04-04T13:26:48","guid":{"rendered":"https:\/\/www.aluminaceramicball.com\/?p=6656"},"modified":"2021-08-04T17:57:08","modified_gmt":"2021-08-04T17:57:08","slug":"diferencia-entre-corindon-sinterizado-y-alumina-tabular","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/es\/diferencia-entre-corindon-sinterizado-y-alumina-tabular\/","title":{"rendered":"La diferencia entre el corind\u00f3n sinterizado y la al\u00famina tabular"},"content":{"rendered":"<p><strong>1.Al\u00famina sinterizada<\/strong><\/p>\n<p>La al\u00famina sinterizada tambi\u00e9n se denomina corind\u00f3n sinterizado. Es un clinker refractario hecho de al\u00famina calcinada o <a href=\"\/es\/producto\/polvo-ceramico-de-alumina\/\" target=\"_blank\" rel=\"noopener\">al\u00famina industrial en polvo<\/a> como materia prima, finamente molida en bolas o cuerpos verdes, y sinterizada a una temperatura elevada de 1750-1900\u00b0C. La al\u00famina sinterizada con un W(Al2O3) superior a 99% est\u00e1 compuesta en su mayor parte por corind\u00f3n uniforme de grano fino combinado directamente, la porosidad aparente es inferior a 3,0%, la densidad aparente alcanza 3,60g\/cm3, y la refractariedad se aproxima al punto de fusi\u00f3n del corind\u00f3n. Tiene buena estabilidad de volumen y estabilidad qu\u00edmica, no se corroe f\u00e1cilmente por atm\u00f3sfera reductora, vidrio fundido y metal fundido, y tiene buena resistencia mec\u00e1nica y resistencia al desgaste a temperatura ambiente y a alta temperatura.<\/p>\n<p>La densidad aparente y el tama\u00f1o de los cristales de la al\u00famina sinterizada est\u00e1n estrechamente relacionados con factores como el tipo de materias primas utilizadas en el proceso de sinterizaci\u00f3n, el m\u00e9todo de peletizaci\u00f3n o conformaci\u00f3n, la densidad inicial de la masa, el tipo y la cantidad de aditivos y la temperatura de calcinaci\u00f3n. La adici\u00f3n de menos de 1% (fracci\u00f3n m\u00e1sica) de TiO2 puede reducir la temperatura de sinterizaci\u00f3n y aumentar la densidad de la al\u00famina sinterizada; la adici\u00f3n de m\u00e1s de 2% a 3% (fracci\u00f3n m\u00e1sica) de TiO2 reducir\u00e1 su densidad; otro efecto de la adici\u00f3n de TiO2 es la obtenci\u00f3n de clinker de part\u00edculas grandes, la al\u00famina sinterizada cristalizada de part\u00edculas grandes tiene buena resistencia a la erosi\u00f3n por escorias. Tambi\u00e9n es posible a\u00f1adir de 1% a 2% (fracci\u00f3n de masa) de H3BO3 para favorecer el crecimiento de los granos de corind\u00f3n. Otra finalidad de la adici\u00f3n de H3BO3 es reaccionar con el Na2O de la materia prima para generar Na3BO3 y volatilizarse, reduciendo el contenido de Na2O en la materia prima. A veces, para inhibir el crecimiento anormal de los cristales de corind\u00f3n, se puede a\u00f1adir una peque\u00f1a cantidad de MgO.<\/p>\n<p>La calcinaci\u00f3n de la al\u00famina sinterizada se realiza principalmente en un horno de llama invertida o en un horno rotatorio.<\/p>\n<p>La al\u00famina sinterizada se utiliza principalmente como materia prima para la producci\u00f3n de ladrillos de corind\u00f3n sinterizados y refractarios amorfos, y su temperatura de utilizaci\u00f3n es bastante elevada.<\/p>\n<p>Sin embargo, este tipo de materia prima provoca el crecimiento de cristales cuando el tiempo de calentamiento secundario es largo, y como resultado, el l\u00edmite de soluci\u00f3n s\u00f3lida puede disminuir, y se generan precipitados en el l\u00edmite de grano, lo que afecta a su rendimiento a alta temperatura.<\/p>\n<p><strong>2. <a href=\"https:\/\/www.aluminaceramicball.com\/es\/uso-de-corindon-tabular-sinterizado-en-refractarios\/\">Al\u00famina tabular<\/a><\/strong><\/p>\n<p><a href=\"\/es\/producto\/alumina-tabular\/\" target=\"_blank\" rel=\"noopener\">Al\u00famina tabular<\/a>tambi\u00e9n conocido como <a href=\"https:\/\/www.aluminaceramicball.com\/es\/proceso-de-produccion-del-corindon-tabular\/\">corind\u00f3n tabular<\/a> en China, es una al\u00famina pura, sinterizada, cocida sin aditivos y completamente encogida.<\/p>\n<p>La al\u00famina en forma de placa est\u00e1 hecha de polvo de al\u00famina. Despu\u00e9s de molerla, darle forma y secarla, se sinteriza en un horno de temperatura ultra alta a una temperatura ligeramente inferior al punto de fusi\u00f3n del corind\u00f3n, en condiciones de calentamiento y enfriamiento r\u00e1pidos, formando muchos enlaces apretados. Los cristales laja-columnar son grandes, con un di\u00e1metro medio de 40-200 micras. La morfolog\u00eda bidimensional de los cristales es plana e intercalada. El cristal contiene muchos poros circulares cerrados de 5-15 micras, con menos poros abiertos. , generalmente de 2% a 3%.<\/p>\n<p>Debido a que la al\u00famina en planchas no a\u00f1ade ning\u00fan aditivo, tiene alta pureza, alto punto de fusi\u00f3n, alta dureza de los granos de cristal, alta resistencia a la carga t\u00e9rmica, baja contracci\u00f3n t\u00e9rmica, alta densidad, baja permeabilidad al aire y buena resistencia al desgaste, especialmente porque hay muchos granos de cristal. Los poros peque\u00f1os est\u00e1n cerrados, y la estabilidad al choque t\u00e9rmico es buena. Excepto el \u00e1cido fluorh\u00eddrico y el \u00e1cido fosf\u00f3rico, la mayor\u00eda de los \u00e1lcalis y \u00e1cidos inorg\u00e1nicos no afectan al corind\u00f3n tabular y son resistentes a los ataques qu\u00edmicos.<\/p>\n<p>Debido a una serie de caracter\u00edsticas de la al\u00famina en placa, se convierte en una materia prima refractaria ideal. Puede utilizarse como agregado en materiales refractarios como A12O3-C, A12O3-SiO2-C y Al2O3-Cr2O3, o puede a\u00f1adirse a otros refractarios en materiales refractarios no conformados de alta al\u00famina. Los refractarios monol\u00edticos de al\u00famina en forma de placa combinados con cemento de fosfato y aluminato de calcio se han utilizado ampliamente. Cualquier parte en la que se utilice corind\u00f3n fundido o corind\u00f3n blanco puede sustituirse por al\u00famina en forma de placa, con lo que se puede mejorar el rendimiento de los materiales refractarios.<\/p>\n<p>La calcinaci\u00f3n de la al\u00famina en forma de placa se realiza principalmente en un horno de cuba de alta temperatura.<\/p>\n<p>La aplicaci\u00f3n de la al\u00famina en placas en la industria sider\u00fargica abarca pr\u00e1cticamente desde altos hornos, altos hornos en caliente, hornos de mezcla, tanques torpedo hasta convertidores, hornos de refinado secundario, cucharas, artesas, hornos de inmersi\u00f3n y hornos de calentamiento para fundici\u00f3n a presi\u00f3n y colada continua. Espera para todas las piezas en las que se utilizan refractarios de al\u00famina.<\/p>\n<p>En la industria cer\u00e1mica, la al\u00famina en forma de placa se utiliza en el mobiliario de hornos para mejorar significativamente su rendimiento. Por ejemplo, puede mejorar la estabilidad al choque t\u00e9rmico y la capacidad antideformaci\u00f3n de los rodillos cer\u00e1micos; puede utilizarse para fabricar saggers y placas para cer\u00e1micas de alta temperatura, como las buj\u00edas, <a href=\"https:\/\/www.aluminaceramicball.com\/es\/caracteristicas-de-las-bolas-de-alumina\/\">bolas de al\u00famina<\/a>etc., y se ha mejorado notablemente su vida \u00fatil. La al\u00famina en forma de placa tambi\u00e9n puede utilizarse como aislante y como materia prima para fabricar soportes de catalizadores para reacciones a alta temperatura que requieren baja porosidad, alta resistencia y gran pureza.<\/p>\n<p>Aunque la mullita sinterizada y la espinela sinterizada tambi\u00e9n son cl\u00ednker refractario, son materias primas sint\u00e9ticas.<\/p>","protected":false},"excerpt":{"rendered":"<p>1.Sintered alumina Sintered alumina is also called sintered corundum. It is a refractory clinker made of calcined alumina or industrial alumina powder as raw material, finely ground into balls or green bodies, and sintered at a high temperature of 1750-1900\u00b0C. Sintered alumina with a W(Al2O3) over 99% is mostly made of uniform fine-grained corundum directly [&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 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