{"id":7348,"date":"2021-01-05T05:18:41","date_gmt":"2021-01-05T05:18:41","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7348"},"modified":"2022-03-16T01:46:36","modified_gmt":"2022-03-16T01:46:36","slug":"alumina-ceramic-foam-filter-material","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/alumina-ceramic-foam-filter-material\/","title":{"rendered":"Material filtrante de espuma cer\u00e1mica de al\u00famina"},"content":{"rendered":"<p>Para quienes est\u00e1n familiarizados con los materiales refractarios que se utilizan para contener el aluminio fundido y sus aleaciones, el uso de part\u00edculas de al\u00famina en el material filtrante de espuma cer\u00e1mica parece una opci\u00f3n obvia.<\/p>\n<p>La al\u00famina es relativamente inerte desde el punto de vista qu\u00edmico en el aluminio fundido y en sus aleaciones m\u00e1s comunes, incluidas las aleaciones de magnesio. Tambi\u00e9n se utiliza ampliamente como material en forma de part\u00edculas en los materiales refractarios destinados a la fusi\u00f3n y el mantenimiento de aleaciones de aluminio fundido en los hornos. Adem\u00e1s, antes del desarrollo de un filtro de espuma cer\u00e1mica desechable, se utilizaba un filtro de lecho de al\u00famina en forma de placa para <a href=\"http:\/\/www.alalloycasting.com\/es\/molten-aluminum-filtration\/\">filtrar aluminio fundido<\/a>.<\/p>\n<p>El <a href=\"http:\/\/www.alalloycasting.com\/es\/deep-bed-filter\/\">filtro de lecho<\/a> es un recipiente de calentamiento de gran tama\u00f1o que contiene part\u00edculas de al\u00famina en forma de escamas no aglomeradas, que puede utilizarse para realizar fundiciones repetidas durante d\u00edas o incluso semanas. Al igual que en los filtros de lecho y los materiales refractarios, la exposici\u00f3n prolongada del metal fundido a un agregado no aglomerado requiere el uso de materiales particulados qu\u00edmicamente inertes, como la al\u00famina.<\/p>\n<p>Sin embargo, la al\u00famina presenta un elevado coeficiente de expansi\u00f3n t\u00e9rmica lineal (8,0\u00d710\u207b\u2076\/\u00b0C) y, debido a la elevada tensi\u00f3n t\u00e9rmica generada por la combinaci\u00f3n, la forma general de los productos de al\u00famina \u2014como los filtros de espuma cer\u00e1mica\u2014 presenta una escasa resistencia al choque t\u00e9rmico. Los cambios en el gradiente t\u00e9rmico se deben a un calentamiento desigual y al elevado 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 romperse t\u00e9rmicamente o desprenderse, lo que provoca que el material del filtro se libere en el lingote o la palanquilla en forma de inclusiones. Adem\u00e1s, cuando el filtro de al\u00famina espumada se encuentra confinado en la cubeta del filtro durante el precalentamiento y su uso, puede generarse una elevada tensi\u00f3n de compresi\u00f3n lateral debido a la elevada tasa de expansi\u00f3n t\u00e9rmica del filtro, lo que da lugar a un fallo por compresi\u00f3n del mismo.<\/p>\n<p>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 cuando se seca a una temperatura relativamente baja, una baja contracci\u00f3n en estado fresco y, adem\u00e1s, una buena resistencia durante 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 (1100 \u00b0C) para obtener el enlace 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. Sin embargo, en muchas aleaciones de aluminio disponibles en el mercado, el enlace de fosfato de aluminio resultante reacciona f\u00e1cilmente con el magnesio.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7287\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/12\/Alumina-Ceramic-Foam-Filter-for-Refining-1.jpg\" alt=\"Filtro de espuma cer\u00e1mica de al\u00famina para refiner\u00eda\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Alumina-Ceramic-Foam-Filter-for-Refining-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Alumina-Ceramic-Foam-Filter-for-Refining-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>AdTech ofrece <a href=\"http:\/\/www.alalloycasting.com\/es\/alumina-ceramic-foam-filter\/\">filtro de espuma cer\u00e1mica de al\u00famina<\/a> para aluminio fundido. El filtro presenta una elevada resistencia al choque t\u00e9rmico, una alta resistencia a la corrosi\u00f3n, una resistencia mec\u00e1nica suficiente, un proceso de fabricaci\u00f3n econ\u00f3mico, es respetuoso con el medio ambiente y tiene una densidad inferior a la de los filtros conocidos. La pasta de fabricaci\u00f3n de los filtros de espuma cer\u00e1mica contiene al\u00famina, s\u00edlice, compuestos de calcio, compuestos de boro y otros componentes. La espuma de c\u00e9lula abierta se impregna con la pasta para volatilizar y sinterizar el soporte.<\/p>\n<h2>Ventajas del material de filtro de espuma cer\u00e1mica de al\u00famina<\/h2>\n<ul>\n<li>Alta resistencia al choque t\u00e9rmico: durante el precalentamiento o el contacto con el metal fundido, el material no debe agrietarse ni desprenderse. Cuando el material de espuma cer\u00e1mica se instala en el <a href=\"http:\/\/www.alalloycasting.com\/es\/cff-filter-box\/\">recipiente del filtro<\/a>, deber\u00eda tener un bajo coeficiente de expansi\u00f3n t\u00e9rmica para minimizar la tensi\u00f3n de compresi\u00f3n lateral.<\/li>\n<li>Resistencia a la corrosi\u00f3n: El material filtrante de espuma cer\u00e1mica de al\u00famina no debe reaccionar de forma significativa en el rango de aplicaci\u00f3n previsto (tiempo, temperatura, contenido de aleaci\u00f3n) y debe mantener la humectabilidad del aluminio fundido y sus aleaciones habituales.<\/li>\n<li>Resistencia suficiente a la flexi\u00f3n y a la compresi\u00f3n.<\/li>\n<li>Econom\u00eda de la producci\u00f3n.<\/li>\n<li>De baja densidad y peso ligero, f\u00e1cil de manejar.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>For those familiar with the refractory materials used to contain molten aluminum and its alloys, the use of alumina particles in ceramic foam filter material&hellip;<\/p>","protected":false},"author":1,"featured_media":7349,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-7348","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Alumina Ceramic Foam Filter Material for Molten Aluminum<\/title>\n<meta name=\"description\" content=\"The alumina ceramic foam filter material is also widely used as a particulate material in refractories for holding molten aluminum.\" \/>\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-ceramic-foam-filter-material\/\" \/>\n<meta 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