{"id":11784,"date":"2021-12-13T06:13:02","date_gmt":"2021-12-13T06:13:02","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=11784"},"modified":"2021-12-13T06:13:02","modified_gmt":"2021-12-13T06:13:02","slug":"alumina-filter-for-molten-aluminum","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/alumina-filter-for-molten-aluminum\/","title":{"rendered":"Filtro de al\u00famina para aluminio fundido"},"content":{"rendered":"

El uso de part\u00edculas de al\u00famina en los filtros de espuma cer\u00e1mica parece ser una opci\u00f3n obvia para la filtraci\u00f3n del aluminio fundido y sus aleaciones. La al\u00famina es relativamente inerte qu\u00edmicamente en el aluminio fundido. Tambi\u00e9n se utiliza ampliamente como material particulado en los materiales refractarios empleados en los hornos para fundir y mantener las aleaciones de aluminio fundidas. Adem\u00e1s, antes del desarrollo de los filtros de espuma cer\u00e1mica desechables, se utilizaba un filtro de lecho de al\u00famina en forma de placas para la filtraci\u00f3n del aluminio fundido. Un filtro de lecho es un gran recipiente calefactado que contiene part\u00edculas de al\u00famina sin aglomerar con forma de placa y se utiliza para fundiciones repetidas durante un per\u00edodo de d\u00edas o incluso semanas. La exposici\u00f3n prolongada del metal fundido a materiales agregados sueltos (como los filtros de lecho y los materiales refractarios) requiere el uso de materiales particulados qu\u00edmicamente inertes, como la al\u00famina.<\/p>\n

Sin embargo, la al\u00famina tiene un coeficiente de expansi\u00f3n t\u00e9rmica lineal relativamente alto (8,0\u00d710^-6\/\u00b0C), y la forma general de la al\u00famina, como por ejemplo filtro de espuma cer\u00e1mica<\/a>, presenta una escasa resistencia al choque t\u00e9rmico debido a la elevada tensi\u00f3n t\u00e9rmica generada por la combinaci\u00f3n del gradiente t\u00e9rmico \u2014provocado por un calentamiento desigual\u2014 y un alto coeficiente de expansi\u00f3n t\u00e9rmica. Durante el precalentamiento y el contacto inicial con el metal fundido, el material del filtro de espuma cer\u00e1mica puede sufrir grietas o desprendimientos por choque t\u00e9rmico, lo que provoca que el material del filtro se libere en el lingote o la palanquilla y se convierta en inclusiones en ellos. Adem\u00e1s, cuando el filtro de espuma de al\u00famina se encuentra en una cubeta de filtrado de espacio reducido durante el precalentamiento y su uso, la elevada tasa de expansi\u00f3n t\u00e9rmica del filtro puede dar lugar a una elevada tensi\u00f3n de compresi\u00f3n lateral, lo que provoca da\u00f1os por compresi\u00f3n en el filtro.<\/p>\n

\"\"<\/p>\n

El ortofosfato de aluminio (Al(H\u2082PO\u2084)\u2083) se utiliza ampliamente como aglutinante refractario en la industria metal\u00fargica. Presenta una buena resistencia en estado fresco durante el proceso de secado a una temperatura relativamente baja, una baja contracci\u00f3n del cuerpo en estado fresco y una buena resistencia en el posterior proceso de cocci\u00f3n. El ortofosfato de aluminio es relativamente barato, se encuentra f\u00e1cilmente y requiere una temperatura de cocci\u00f3n relativamente baja (1.100 \u00b0C) para obtener la uni\u00f3n final de fosfato de aluminio (AlPO\u2084). Por estas razones, y debido al coste relativamente bajo del ortofosfato de aluminio, este material se utiliza ampliamente para fabricar filtros de espuma cer\u00e1mica destinados a la filtraci\u00f3n de aluminio fundido.<\/p>\n

Sin embargo, el enlace de fosfato de aluminio formado reacciona con el magnesio presente en muchas aleaciones de aluminio comerciales y no es adecuado para aleaciones de aluminio y magnesio. El magnesio presente en el aluminio fundido es muy reactivo, tiene una presi\u00f3n de vapor relativamente alta y penetra f\u00e1cilmente en cualquier matriz refractaria. Adem\u00e1s, reacciona f\u00e1cilmente con casi todos los materiales \u00f3xidos habituales.<\/p>","protected":false},"excerpt":{"rendered":"

The use of alumina particles in ceramic foam filter seems to be an obvious choice for molten aluminum and its alloys filtration. Alumina is relatively…<\/p>","protected":false},"author":1,"featured_media":11785,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[13043,21],"class_list":["post-11784","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-alumina-filter-for-molten-aluminum","tag-ceramic-foam-filter"],"yoast_head":"\nAlumina Filter for Molten Aluminum, Ceramic Foam Filter<\/title>\n<meta name=\"description\" content=\"The use of alumina particles in ceramic foam filter seems to be an obvious choice for molten aluminum and its alloys filtration.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/es\/alumina-filter-for-molten-aluminum\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" 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