{"id":5654,"date":"2019-09-03T08:52:29","date_gmt":"2019-09-03T08:52:29","guid":{"rendered":"http:\/\/www.adtechamm.com\/?p=5654"},"modified":"2019-09-03T08:57:57","modified_gmt":"2019-09-03T08:57:57","slug":"reticulated-ceramic-foam-filters","status":"publish","type":"post","link":"https:\/\/www.adtechamm.com\/es\/reticulated-ceramic-foam-filters\/","title":{"rendered":"Filtros de espuma cer\u00e1mica reticulada"},"content":{"rendered":"

Filtros de espuma cer\u00e1mica reticulada<\/p>\n

Los filtros de espuma cer\u00e1mica reticulada utilizados con material granular de \u00f3xido de aluminio deber\u00edan parecer una opci\u00f3n obvia para cualquier experto en el \u00e1mbito de los materiales refractarios empleados para contener aluminio fundido y sus aleaciones.
\nLa 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 que contienen magnesio.
\nLos filtros de espuma cer\u00e1mica reticulada tambi\u00e9n se utilizan ampliamente como material granular en los materiales refractarios empleados en hornos, tanto para la fundici\u00f3n como para contener aleaciones de aluminio fundidas.
\nAdem\u00e1s, antes de la aparici\u00f3n de los filtros desechables de espuma cer\u00e1mica reemplazables para filtrar el aluminio fundido, se utilizaban filtros con relleno de al\u00famina laminar. Los filtros con relleno son grandes recipientes calentados que contienen granos sueltos de al\u00famina laminar, y se utilizan para fundiciones repetidas durante varios d\u00edas o incluso semanas. El prolongado tiempo de exposici\u00f3n del metal fundido a materiales agregados no aglomerados, como en filtro de espuma cer\u00e1mica<\/a> con materiales de relleno y refractarios, requiere el uso de un material granular qu\u00edmicamente inerte, como el \u00f3xido de aluminio.<\/p>\n

\"Filtros<\/p>\n

Sin embargo, la al\u00famina tiene un coeficiente de expansi\u00f3n t\u00e9rmica lineal relativamente alto (8,0 \u00d7 10\u207b\u2076 \/ \u00b0C), y las formas monol\u00edticas de al\u00famina, como los filtros de espuma cer\u00e1mica, presentan una baja resistencia al calor debido a las elevadas tensiones t\u00e9rmicas generadas por la combinaci\u00f3n de los gradientes t\u00e9rmicos resultantes de un calentamiento desigual y un elevado coeficiente de expansi\u00f3n t\u00e9rmica.
\nDurante el proceso de precalentamiento y el contacto inicial con el metal fundido, el material filtrante de espuma cer\u00e1mica reticulada puede agrietarse o romperse, lo que provoca que el material filtrante penetre en el lingote o la palanquilla, donde se convierte en una inclusi\u00f3n.
\nAdem\u00e1s, cuando el filtro cer\u00e1mico de espuma a base de al\u00famina se mantiene en el recipiente del filtro durante el precalentamiento y su uso, pueden generarse elevadas tensiones de compresi\u00f3n transversales como consecuencia del elevado coeficiente de expansi\u00f3n t\u00e9rmica del filtro, lo que provoca la destrucci\u00f3n del mismo durante la compresi\u00f3n.<\/p>\n

A continuaci\u00f3n se indican los requisitos que debe cumplir el material ideal para un filtro de espuma cer\u00e1mica.
\n1. Resistencia a altas temperaturas: el material no debe agrietarse ni romperse durante el precalentamiento ni al entrar en contacto con el metal fundido. El material debe tener una baja expansi\u00f3n t\u00e9rmica para minimizar las tensiones de compresi\u00f3n laterales mientras se encuentra en la cubeta del filtro.
\n2. Resistencia a la corrosi\u00f3n: el material del filtro no debe presentar una actividad qu\u00edmica significativa en el rango de aplicaci\u00f3n previsto (tiempo, temperatura, contenido de aleaci\u00f3n) y no debe entrar en contacto con el aluminio fundido ni con sus aleaciones convencionales.
\n3. Resistencia adecuada a la flexi\u00f3n y a la compresi\u00f3n.
\n4. Rentabilidad en el sector manufacturero.
\n5. El material filtrante, una vez utilizado, debe poder manipularse y eliminarse de forma segura.
\n6. Baja densidad o peso ligero, lo que facilita el trabajo del operario encargado del vertido.<\/p>","protected":false},"excerpt":{"rendered":"

Reticulated ceramic foam filters Reticulated ceramic foam filters used in aluminum oxide granular material should seem an obvious choice to any person skilled in the art of refractory materials used to contain molten aluminum and its alloys. 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