{"id":3048,"date":"2020-07-25T11:04:27","date_gmt":"2020-07-25T11:04:27","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3048"},"modified":"2020-10-19T07:06:34","modified_gmt":"2020-10-19T07:06:34","slug":"molten-metal-foam-filter","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/molten-metal-foam-filter\/","title":{"rendered":"Filtro de espuma para metal fundido"},"content":{"rendered":"

O filtro de espuma para metal fundido \u00e9 capaz de remover as impurezas n\u00e3o met\u00e1licas no processo de fundi\u00e7\u00e3o de metais.<\/p>\n

A presen\u00e7a de impurezas n\u00e3o met\u00e1licas que penetram na massa fundida durante todo o processo de fus\u00e3o e fundi\u00e7\u00e3o do metal l\u00edquido afeta negativamente a qualidade do metal fundido. Esse fato \u00e9 bem conhecido pelos produtores de a\u00e7o, fundidores e metal\u00fargicos.<\/p>\n

Na grande maioria dos casos, as inclus\u00f5es n\u00e3o met\u00e1licas s\u00e3o \u00f3xidos refrat\u00e1rios com ponto de fus\u00e3o superior \u00e0 temperatura de fus\u00e3o do a\u00e7o. Trata-se principalmente de \u00f3xidos de magn\u00e9sio, c\u00e1lcio, alum\u00ednio e sil\u00edcio, que fazem parte da esc\u00f3ria e do material de revestimento. Uma parte significativa das inclus\u00f5es n\u00e3o met\u00e1licas se forma na massa fundida como resultado da desoxida\u00e7\u00e3o do a\u00e7o. A solubilidade dos \u00f3xidos no ferro puro \u00e9 insignificante ou totalmente inexistente.<\/p>\n

As inclus\u00f5es n\u00e3o met\u00e1licas s\u00e3o, na maioria das vezes, representadas por part\u00edculas s\u00f3lidas e compactas. As camadas de \u00f3xido na massa fundida encontram-se no estado l\u00edquido, mas apresentam uma viscosidade significativamente maior do que a do metal fundido. O teor dessas impurezas pode ser significativamente reduzido. Isso pode ser alcan\u00e7ado por meio de uma ampla gama de medidas, incluindo o corte de esc\u00f3ria de alta qualidade, a redu\u00e7\u00e3o da eros\u00e3o do revestimento das unidades de produ\u00e7\u00e3o de a\u00e7o, das calhas de a\u00e7o, das conchas de fundi\u00e7\u00e3o e das conchas intermedi\u00e1rias, a inje\u00e7\u00e3o de gases inertes na massa fundida e tamb\u00e9m a filtragem do metal por meio de diversas op\u00e7\u00f5es e m\u00e9todos de filtragem.<\/p>\n

Devido ao fato de que a composi\u00e7\u00e3o fracion\u00e1ria das inclus\u00f5es n\u00e3o met\u00e1licas varia em uma faixa muito ampla \u2014 de fra\u00e7\u00f5es de um m\u00edcron a dezenas de mil\u00edmetros \u2014, o grau de purifica\u00e7\u00e3o do metal e, consequentemente, sua qualidade dependem dos m\u00e9todos de limpeza utilizados em sua produ\u00e7\u00e3o.<\/p>\n

Os \u00f3xidos e as bolhas de g\u00e1s, cuja densidade \u00e9 v\u00e1rias vezes menor do que a do ferro l\u00edquido, sob certas condi\u00e7\u00f5es \u2014 descritas por leis f\u00edsicas bem conhecidas \u2014, s\u00e3o capazes de migrar completamente para a superf\u00edcie do metal fundido. No entanto, o cumprimento dessas condi\u00e7\u00f5es \u00e9 praticamente imposs\u00edvel. Em particular, com o aumento do tempo de perman\u00eancia do metal fundido nas unidades de produ\u00e7\u00e3o de a\u00e7o e a diminui\u00e7\u00e3o de sua viscosidade, o desgaste do revestimento aumenta e ocorre a satura\u00e7\u00e3o secund\u00e1ria do metal l\u00edquido com inclus\u00f5es n\u00e3o met\u00e1licas. O tratamento intensivo do metal fundido com um g\u00e1s inerte permite remover no m\u00e1ximo 15% de inclus\u00f5es n\u00e3o met\u00e1licas, enquanto a maioria das part\u00edculas com tamanho inferior a 50 m\u00edcrons permanece no metal l\u00edquido.<\/p>\n

Gostar\u00edamos de nos deter no m\u00e9todo mais delicado de purifica\u00e7\u00e3o de metais<\/a>, quando a satura\u00e7\u00e3o da massa fundida com impurezas n\u00e3o met\u00e1licas \u00e9 inevit\u00e1vel. Esse m\u00e9todo consiste em filtrar o metal por meio de um filtro de espuma para metal fundido, o que permite remover quase todas as inclus\u00f5es n\u00e3o met\u00e1licas e bolhas de g\u00e1s presentes.<\/p>\n

\"Filtro<\/p>\n

Os filtros s\u00e3o compostos por espuma cer\u00e2mica a granel, fabricada com materiais altamente refrat\u00e1rios, com um determinado n\u00famero de orif\u00edcios e uma \u00e1rea superficial espec\u00edfica.<\/p>\n

O mecanismo de limpeza da massa fundida por meio de filtros de espuma cer\u00e2mica \u00e9 bastante complexo e ainda pouco compreendido; no entanto, a efici\u00eancia dessa t\u00e9cnica de limpeza pode ser considerada \u00fanica. Isso pode ser confirmado pelos trabalhadores de fundi\u00e7\u00f5es, que conseguem utilizar materiais semelhantes de fabrica\u00e7\u00e3o estrangeira para produzir pe\u00e7as fundidas de alta qualidade.<\/p>\n

Dependendo do Filtro de Espuma de Metal Fundido e de sua configura\u00e7\u00e3o, \u00e9 poss\u00edvel realizar tanto a desgaseifica\u00e7\u00e3o completa quanto a seletiva da massa fundida. Quando um metal contaminado passa por um filtro, \u00e9 induzida uma for\u00e7a eletromotriz (FEM) no interior da base cer\u00e2mica, que pode ser controlada pela fase e pela composi\u00e7\u00e3o qu\u00edmica, bem como pela \u00e1rea superficial espec\u00edfica da cer\u00e2mica e pela vaz\u00e3o do metal. Ao passar por um filtro cer\u00e2mico, o fluxo de metal l\u00edquido, al\u00e9m de ser purificado, \u00e9 ainda mais homogeneizado. Isso, obviamente, afeta a qualidade da pe\u00e7a fundida.<\/p>\n

A experi\u00eancia mundial j\u00e1 adquirida no uso de filtros de espuma cer\u00e2mica para a purifica\u00e7\u00e3o de metais de baixo ponto de fus\u00e3o, bem como na filtragem de a\u00e7o por fundi\u00e7\u00e3o de precis\u00e3o utilizando o m\u00e9todo de fundi\u00e7\u00e3o por cera perdida, com as devidas melhorias estruturais, permitir\u00e1 que voc\u00ea purifique volumes muito maiores de metal l\u00edquido.<\/p>\n

\u00c0 medida que os filtros ficam obstru\u00eddos em um n\u00edvel, o metal sobe para o pr\u00f3ximo n\u00edvel de filtros, que pode ter uma estrutura e um n\u00famero de orif\u00edcios diferentes. O n\u00edvel superior dos orif\u00edcios na divis\u00f3ria n\u00e3o possui filtros. Assim, ao fundir o metal de acordo com seu n\u00edvel, \u00e9 poss\u00edvel controlar a qualidade dos lingotes quanto ao teor de inclus\u00f5es n\u00e3o met\u00e1licas. \u00c9 poss\u00edvel instalar filtros \u201cgrossos\u201d e \u201cfinos\u201d nas aberturas da divis\u00f3ria.<\/p>\n

Atualmente, em parceria com diversas empresas metal\u00fargicas, est\u00e3o sendo realizados trabalhos preparat\u00f3rios para testar esse m\u00e9todo de remo\u00e7\u00e3o de inclus\u00f5es n\u00e3o met\u00e1licas do metal l\u00edquido e para avaliar as composi\u00e7\u00f5es e os par\u00e2metros dos filtros cer\u00e2micos.<\/p>","protected":false},"excerpt":{"rendered":"

Molten Metal Foam Filter can filter out the non-metallic impurities in metal casting process. The presence of non-metallic impurities that enter the melt during the…<\/p>","protected":false},"author":1,"featured_media":5780,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39,138],"tags":[1719],"class_list":["post-3048","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-foundry-ceramic-filters","category-seo","tag-molten-metal-foam-filter"],"yoast_head":"\nMolten Metal Foam Filter,Ceramic Foam Filter Manufacturer<\/title>\n<meta name=\"description\" content=\"Molten Metal Foam Filter can filter out the non-metallic impurities in metal casting process. 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