{"id":6930,"date":"2020-12-10T03:19:24","date_gmt":"2020-12-10T03:19:24","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6930"},"modified":"2020-12-10T03:19:24","modified_gmt":"2020-12-10T03:19:24","slug":"filtration-of-molten-metal","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/filtration-of-molten-metal\/","title":{"rendered":"Filtragem de metal fundido"},"content":{"rendered":"

Naturalmente, h\u00e1 uma grande necessidade de melhorar a filtragem e a desgaseifica\u00e7\u00e3o do metal fundido para remover ou minimizar tais impurezas no produto fundido final, especialmente no caso do alum\u00ednio fundido, sobretudo quando o metal resultante \u00e9 utilizado para, por exemplo, produtos de alum\u00ednio. Produtos decorativos (como tiras decorativas) ou produtos com especifica\u00e7\u00f5es-chave (como pe\u00e7as forjadas e extrus\u00f5es para aeronaves e mat\u00e9rias-primas para folhas leves). As impurezas mencionadas acima causam perdas de desempenho no produto fundido final, como resist\u00eancia \u00e0 tra\u00e7\u00e3o e resist\u00eancia \u00e0 corros\u00e3o.<\/p>\n

O metal fundido, especialmente o alum\u00ednio fundido na pr\u00e1tica, geralmente cont\u00e9m impurezas gasosas e s\u00f3lidas arrastadas e dissolvidas que s\u00e3o prejudiciais ao produto final fundido. Essas impurezas podem afetar a solidifica\u00e7\u00e3o do metal fundido final ap\u00f3s a fus\u00e3o, o que pode dificultar o processamento, comprometer a ductilidade do produto final ou prejudicar a capacidade de anodiza\u00e7\u00e3o. As impurezas podem ter diversas origens. Por exemplo, elas podem incluir impurezas met\u00e1licas, como metais alcalinos e metais alcalino-terrosos, bem como hidrog\u00eanio dissolvido e pel\u00edculas de \u00f3xido superficiais que ficam retidas e arrastadas no metal fundido. Al\u00e9m disso, as inclus\u00f5es podem provir de impurezas insol\u00faveis, como carbonetos, boretos etc., ou de refrat\u00e1rios corro\u00eddos de fornos e tanques.<\/p>\n

Processos rigorosos de tratamento de metais (como o fluxo de g\u00e1s ou a filtragem do metal fundido) minimizaram a incid\u00eancia desses defeitos. No entanto, n\u00e3o conseguiram reduzir a incid\u00eancia desses defeitos a um n\u00edvel satisfat\u00f3rio, necess\u00e1rio para aplica\u00e7\u00f5es cr\u00edticas. Os processos convencionais de fluxo de g\u00e1s condutor, como o fluxo de fornalha geral, envolvem a introdu\u00e7\u00e3o de g\u00e1s de fluxo em um forno de reten\u00e7\u00e3o contendo uma determinada quantidade de metal fundido. Esse procedimento exige que o forno seja desligado durante a circula\u00e7\u00e3o do g\u00e1s de fluxo, de modo que a temperatura do metal em processamento permane\u00e7a constante e o processamento possa ocorrer. Esse m\u00e9todo apresenta muitas desvantagens; entre elas, a efici\u00eancia \u00e9 reduzida devido ao longo per\u00edodo de inatividade do forno durante a fluxagem, e a efici\u00eancia \u00e9 insuficiente devido \u00e0 baixa rela\u00e7\u00e3o \u00e1rea superficial\/volume entre o g\u00e1s de fluxo e o metal fundido. Outros fatores incluem restri\u00e7\u00f5es quanto \u00e0 localiza\u00e7\u00e3o do forno, o que permite que impurezas voltem a entrar na massa fundida antes da fundi\u00e7\u00e3o, e altas emiss\u00f5es devido \u00e0 grande quantidade de fluxo necess\u00e1ria e ao local de sua circula\u00e7\u00e3o.<\/p>\n

Como alternativa aos fluxos do tipo em lote descritos acima, certos fluxos<\/a> s\u00e3o utilizados em s\u00e9rie. Ou seja, as opera\u00e7\u00f5es e os equipamentos relacionados est\u00e3o localizados fora do forno de fus\u00e3o ou de manuten\u00e7\u00e3o, e geralmente ficam entre o forno de fus\u00e3o e o forno de manuten\u00e7\u00e3o ou entre o forno de manuten\u00e7\u00e3o e a esta\u00e7\u00e3o de fundi\u00e7\u00e3o. Isso ajuda a amenizar a inefici\u00eancia causada pela paralisa\u00e7\u00e3o do forno, mas n\u00e3o \u00e9 t\u00e3o eficaz na melhoria da efici\u00eancia operacional, pois muitas vezes \u00e9 necess\u00e1ria uma grande quantidade de g\u00e1s de fluxo por unidade de metal fundido, o que \u00e9 caro e prejudicial \u00e0 pureza do ar.<\/p>\n

Convencionalmente, a filtra\u00e7\u00e3o do metal fundido \u00e9 utilizada para reduzir a extens\u00e3o dos defeitos acima mencionados. A forma mais comum de filtra\u00e7\u00e3o do metal fundido envolve o uso de metal fundido colocado em um tanque de transfer\u00eancia e vazamento ou em uma camada de tecido de vidro aberta sobre um lingote de metal solidificado. Verificou-se que tais filtros s\u00e3o apenas parcialmente eficazes, pois removem apenas as inclus\u00f5es maiores. Outro filtro comumente utilizado \u00e9, por exemplo, um filtro de leito feito de alumina tubular. Esses filtros apresentam muitas desvantagens, sendo talvez a mais grave delas a enorme dificuldade encontrada no controle e na manuten\u00e7\u00e3o do tamanho dos poros necess\u00e1rio para uma filtragem eficaz. Outra dificuldade com esses filtros \u00e9 que eles tendem a produzir metal de baixa qualidade inicial no in\u00edcio de cada ciclo de lingotamento cont\u00ednuo.<\/p>\n

Materiais cer\u00e2micos porosos em forma de espuma<\/a>\u00a0s\u00e3o particularmente adequados para a filtragem de metal fundido por diversas raz\u00f5es, incluindo excelente capacidade de filtragem, baixo custo, facilidade de uso e possibilidade de uso como descart\u00e1veis. O fato de esses filtros de espuma cer\u00e2mica serem pr\u00e1ticos e baratos de preparar, al\u00e9m de poderem ser usados uma \u00fanica vez, exige o desenvolvimento de um dispositivo que permita a montagem e a remo\u00e7\u00e3o f\u00e1ceis e convenientes dos filtros porosos para metal fundido da unidade de filtragem. Temos um dispositivo de filtragem adequado para a instala\u00e7\u00e3o da placa filtrante.<\/p>","protected":false},"excerpt":{"rendered":"

Naturally, there is a great need to improve the filtration and degassing of molten metal to remove or minimize such impurities in the final cast…<\/p>","protected":false},"author":1,"featured_media":6931,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6930","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nFiltration of Molten Metal with Porous Ceramic Foam Filters<\/title>\n<meta name=\"description\" content=\"Ceramic foam filters\u00a0are particularly suitable for filtration of molten metal for many reasons, including excellent filterability, low cost.\" \/>\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\/filtration-of-molten-metal\/\" \/>\n<meta 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