{"id":10661,"date":"2021-10-19T01:36:18","date_gmt":"2021-10-19T01:36:18","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10661"},"modified":"2021-10-19T01:36:18","modified_gmt":"2021-10-19T01:36:18","slug":"foam-ceramic-filter-for-foundries","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/foam-ceramic-filter-for-foundries\/","title":{"rendered":"Filtro cer\u00e1mico de espuma para fundiciones"},"content":{"rendered":"<p>El filtro cer\u00e1mico de espuma de c\u00e9lula abierta utilizado en las fundiciones de aluminio se desarroll\u00f3 a principios de la d\u00e9cada de 1970, y la tecnolog\u00eda se aplic\u00f3 comercialmente por primera vez en 1974 para producir lingotes laminados destinados a la fabricaci\u00f3n de chapas. Los filtros cer\u00e1micos de espuma son filtros integrales y desechables que se utilizan para una sola colada. El tama\u00f1o de los poros del filtro oscila entre 4 y 28 poros por cent\u00edmetro (de 10 a 70 poros por pulgada lineal), y el tama\u00f1o correspondiente de los poros es de aproximadamente 0,036 a 0,26 cm. Los filtros de espuma cer\u00e1mica suelen fabricarse en formatos cuadrados, con dimensiones que van desde los 22,86 cm \u00d7 22,86 cm \u00d7 5,08 cm (9 pulgadas \u00d7 9 pulgadas \u00d7 2 pulgadas) hasta los 66,04 cm \u00d7 66,04 cm \u00d7 5,08 cm (26 pulgadas \u00d7 26 pulgadas \u00d7 2 pulgadas). Los bordes est\u00e1n biselados y se utilizan para encajar en un recipiente filtrante refractario.<\/p>\n<p>Se fija una junta de papel fibroso en el borde biselado para ejercer una carga de compresi\u00f3n lateral que sujete el filtro en el recipiente del filtro y evite que el metal que rodea el borde del filtro se desplace. El material de soporte fibroso suele tener un grosor de entre 0,317 cm y 0,476 cm (de 1\/8 a 3\/16 de pulgada) y, por lo general, est\u00e1 compuesto por fibras de silicato.<\/p>\n<p>En la d\u00e9cada de 1980, la tecnolog\u00eda de los filtros cer\u00e1micos de espuma para fundiciones fue aceptada de forma r\u00e1pida y generalizada por el mercado y se utiliz\u00f3 para una amplia gama de productos de aluminio de alta calidad, entre los que se incluyen materiales de embalaje r\u00edgidos, l\u00e1minas de impresi\u00f3n litogr\u00e1fica y productos aeroespaciales, como placas, piezas forjadas y extrusiones.<\/p>\n<p>Para cualquiera que est\u00e9 familiarizado con los materiales refractarios utilizados para contener el aluminio fundido y sus aleaciones, el uso de part\u00edculas de al\u00famina en <a href=\"http:\/\/www.alalloycasting.com\/es\/ceramic-foam-filters-foundry\/\">filtros de espuma cer\u00e1mica<\/a> Parece una elecci\u00f3n obvia. La al\u00famina es relativamente inerte qu\u00edmicamente en el aluminio fundido, y es un componente habitual de las aleaciones, incluidas las que contienen magnesio. 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.<\/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 las piezas monol\u00edticas de al\u00famina, como los filtros de espuma cer\u00e1mica, tienen 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 el 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 sufrir grietas o desprendimientos por choque t\u00e9rmico, lo que provoca que el material del filtro se libere en el lingote o la palanquilla, donde se convierte en una inclusi\u00f3n. Adem\u00e1s, cuando el filtro de al\u00famina espumada queda confinado en la copa filtrante durante el precalentamiento y su uso, la elevada tasa de expansi\u00f3n t\u00e9rmica del filtro generar\u00e1 una gran tensi\u00f3n de compresi\u00f3n lateral, lo que provocar\u00e1 la rotura por compresi\u00f3n del filtro.<\/p>","protected":false},"excerpt":{"rendered":"<p>The open-cell foam ceramic filter used in aluminum foundries was developed in the early 1970s, and the technology was first commercially applied in 1974 to&hellip;<\/p>","protected":false},"author":1,"featured_media":10664,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10661","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\/ 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