{"id":3043,"date":"2020-07-25T09:46:54","date_gmt":"2020-07-25T09:46:54","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3043"},"modified":"2020-10-19T07:10:59","modified_gmt":"2020-10-19T07:10:59","slug":"ceramic-filter-for-aluminum","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/ceramic-filter-for-aluminum\/","title":{"rendered":"Filtro cer\u00e1mico para aluminio"},"content":{"rendered":"

El filtro cer\u00e1mico para aluminio debe eliminar eficazmente las part\u00edculas de inclusiones, sin ofrecer una resistencia excesiva al flujo del metal. Para funcionar correctamente, el filtro tambi\u00e9n debe soportar las tensiones t\u00e9rmicas y mec\u00e1nicas que se producen durante la fundici\u00f3n. El filtro no debe deformarse debido a las interacciones entre el metal, la escoria y el propio filtro, ni debe corroerse a causa de las fuerzas que act\u00faan sobre \u00e9l durante el flujo del metal.<\/p>\n

Tipos de filtros cer\u00e1micos para aluminio<\/h2>\n

Los filtros disponibles en el mercado presentan: 1) poros directos con una secci\u00f3n transversal constante (tipo panal), o 2) poros conectados con numerosos cambios de direcci\u00f3n y secci\u00f3n transversal, obtenidos mediante el proceso de espumado. El tercer tipo de filtro tiene forma de embudo, con ranuras estrechas en el cuerpo del mismo. Los materiales refractarios m\u00e1s utilizados son la al\u00famina, la circonia, la circonia espinela, el carburo de silicio y mezclas de estos materiales.<\/p>\n

Tama\u00f1o de los poros (c\u00e9lulas) y porosidad<\/strong><\/p>\n

Celular (poroso) y filtros de espuma cer\u00e1mica<\/a> se fabrican con un determinado rango de tama\u00f1os de poro. En el caso de los filtros celulares, el tama\u00f1o de poro suele expresarse como la relaci\u00f3n entre el n\u00famero de celdas y la pulgada cuadrada. En el caso de los filtros de espuma, el tama\u00f1o de poro suele expresarse como la relaci\u00f3n entre el n\u00famero de poros atravesados por una l\u00ednea recta y la pulgada.<\/p>\n

\"Filtro<\/p>\n

El tama\u00f1o de poro de los filtros extruidos suele oscilar entre 64 y 121 y 240 poros por pulgada cuadrada. En el caso de los filtros de espuma, los tama\u00f1os de poro m\u00e1s habituales son 10, 20 y 30 poros por pulgada. En la fundici\u00f3n de hierro y acero, se prefieren los tama\u00f1os de poro m\u00e1s grandes para garantizar velocidades de llenado del molde suficientes. Se pueden utilizar tama\u00f1os de poro m\u00e1s peque\u00f1os cuando se funden aleaciones con un sobrecalentamiento muy elevado, as\u00ed como en la fundici\u00f3n a la cera perdida, en la que el filtro se calienta junto con el molde.<\/p>\n

En el caso de los filtros de panal prensado, el tama\u00f1o real de los poros y la superficie se determinan r\u00e1pidamente. La geometr\u00eda de los filtros de poros es incomparablemente m\u00e1s compleja. Los filtros de espuma cer\u00e1mica est\u00e1n formados por celdas redondeadas que se conectan entre s\u00ed mediante varias \u201cventanas\u201d. El di\u00e1metro de estas celdas determina la superficie interior del filtro de espuma cer\u00e1mica. El tama\u00f1o de las ventanas representa el di\u00e1metro del canal de restricci\u00f3n por el que pasa el metal fundido.<\/p>\n

Los filtros se colocan horizontalmente en la cavidad de la parte inferior del molde, lo que permite que el metal fundido pase a trav\u00e9s de la superficie abierta del filtro. El metal sella r\u00e1pidamente la superficie del filtro, reduciendo as\u00ed cualquier gradiente t\u00e9rmico en la estructura del mismo. Este sistema protege contra los golpes que se producir\u00edan como consecuencia del flujo de metal sobre el filtro, lo que reduce la probabilidad de que este falle.<\/p>\n

Los filtros tambi\u00e9n funcionan correctamente en posici\u00f3n vertical, aunque en este caso resultan m\u00e1s dif\u00edciles de sustituir. Los filtros redondos son m\u00e1s f\u00e1ciles de colocar en vertical que los cuadrados.<\/p>","protected":false},"excerpt":{"rendered":"

The Ceramic Filter for Aluminum should effectively remove particles of inclusions, but not provide excessive resistance to metal flow. 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