{"id":8351,"date":"2021-04-08T03:49:01","date_gmt":"2021-04-08T03:49:01","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=8351"},"modified":"2021-04-08T03:49:01","modified_gmt":"2021-04-08T03:49:01","slug":"ceramic-foam-filtering","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/ceramic-foam-filtering\/","title":{"rendered":"Filtragem com espuma cer\u00e2mica"},"content":{"rendered":"

O m\u00e9todo de filtragem com espuma cer\u00e2mica \u00e9 utilizado para filtrar e remover s\u00f3lidos arrastados das ligas de alum\u00ednio fundidas. O filtro de espuma cer\u00e2mica possui uma estrutura de c\u00e9lulas abertas, caracterizada pelo fato de uma pluralidade de vazios interconectados estarem envoltos por uma malha cer\u00e2mica. O uso de filtros de espuma cer\u00e2mica<\/a> melhora significativamente a efici\u00eancia da filtragem no alum\u00ednio fundido.<\/p>\n

Na pr\u00e1tica, o alum\u00ednio fundido geralmente cont\u00e9m s\u00f3lidos arrastados que s\u00e3o prejudiciais ao produto final de fundi\u00e7\u00e3o. Esses s\u00f3lidos arrastados geralmente prov\u00eam de tr\u00eas fontes.<\/p>\n

Algumas s\u00e3o part\u00edculas de \u00f3xido de alum\u00ednio que s\u00e3o arrastadas para a corrente l\u00edquida a partir da camada de \u00f3xido flutuante em sua superf\u00edcie, e algumas part\u00edculas arrastadas s\u00e3o fragmentos do revestimento do forno, calha de transfer\u00eancia e outras partes do equipamento de manuseio do alum\u00ednio fundido, que s\u00e3o erodidas e arrastadas pela corrente de alum\u00ednio em movimento; outras part\u00edculas s\u00e3o precipitados de impurezas insol\u00faveis, como compostos intermet\u00e1licos, boretos, carbonetos ou precipitados de outros compostos de alum\u00ednio, como cloretos. Quando essas inclus\u00f5es aparecem no produto fundido final ap\u00f3s a solidifica\u00e7\u00e3o do alum\u00ednio fundido, elas fazem com que o produto final tenha menor ductilidade ou caracter\u00edsticas de acabamento insatisfat\u00f3rias. Portanto, \u00e9 desej\u00e1vel remover os s\u00f3lidos arrastados do fluxo de alum\u00ednio fundido antes que ele seja moldado em um corpo s\u00f3lido que possa ser utilizado tal qual ou submetido a opera\u00e7\u00f5es de conforma\u00e7\u00e3o, como lamina\u00e7\u00e3o, forjamento, extrus\u00e3o etc.<\/p>\n

\"Tratamento<\/p>\n

Os processos de filtragem para remover s\u00f3lidos arrastados dos l\u00edquidos s\u00e3o realizados fazendo com que o l\u00edquido carregado de s\u00f3lidos passe por um meio filtrante poroso que n\u00e3o permita a passagem desses s\u00f3lidos. A filtragem de metal fundido em geral, e de alum\u00ednio fundido em particular, apresenta problemas espec\u00edficos, pois o l\u00edquido \u00e9 t\u00e3o agressivo que \u00e9 dif\u00edcil encontrar um meio filtrante capaz de resistir a ele.<\/p>\n

Em geral, s\u00e3o utilizados dois m\u00e9todos de filtragem para remover s\u00f3lidos arrastados das ligas de alum\u00ednio fundidas antes da fundi\u00e7\u00e3o. O meio filtrante mais comum \u00e9 uma tela de tecido de vidro de trama aberta, colocada na calha de transfer\u00eancia do metal, ao redor do bico de vazamento ou mesmo na po\u00e7a de metal fundido na parte superior do lingote em solidifica\u00e7\u00e3o. Essas telas de tecido s\u00e3o capazes de remover apenas as inclus\u00f5es de maiores dimens\u00f5es do metal e se rompem facilmente durante o uso, pois as fibras de vidro ficam muito fr\u00e1geis \u00e0 temperatura do alum\u00ednio fundido.<\/p>\n

Em outro procedimento da t\u00e9cnica anterior, o alum\u00ednio fundido \u00e9 filtrado por meio de um leito de part\u00edculas soltas de alumina, por exemplo, de alumina tabular; no entanto, esse m\u00e9todo frequentemente apresenta as desvantagens normalmente associadas aos filtros de leito, pois permite a passagem de uma quantidade excessiva de s\u00f3lidos, h\u00e1 uma forte tend\u00eancia \u00e0 forma\u00e7\u00e3o de canais, o que impede o uso eficiente, e o tamanho dos poros do filtro n\u00e3o \u00e9 facilmente controlado, mas muda com facilidade sob as condi\u00e7\u00f5es de uso, de modo que, mesmo quando originalmente com dimens\u00f5es adequadas, n\u00e3o pode ser mantido de forma eficiente. Al\u00e9m disso, o metal deve ser mantido constantemente fundido quando o filtro n\u00e3o est\u00e1 em uso.<\/p>\n

Experimentos comprovaram que o filtro de espuma cer\u00e2mica \u00e9 particularmente \u00fatil na filtragem de metal fundido, especialmente alum\u00ednio fundido. A resist\u00eancia a altas temperaturas do filtro \u00e9 particularmente \u00fatil nas condi\u00e7\u00f5es rigorosas de uso encontradas na filtragem de metal fundido. Al\u00e9m disso, a composi\u00e7\u00e3o do filtro cer\u00e2mico n\u00e3o contamina os metais.<\/p>","protected":false},"excerpt":{"rendered":"

The ceramic foam filtering method is used to filter and remove entrained solids from molten aluminum alloys. The ceramic form filter has an open-cell structure,…<\/p>","protected":false},"author":1,"featured_media":8352,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-8351","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nCeramic Foam Filtering Molten Aluminum,Ceramic Foam Filter<\/title>\n<meta name=\"description\" content=\"Experiments have proved that the ceramic foam filter is particularly useful in filtering molten metal, especially 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\/pt\/ceramic-foam-filtering\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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