{"id":6923,"date":"2020-12-10T02:34:09","date_gmt":"2020-12-10T02:34:09","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6923"},"modified":"2020-12-10T02:34:09","modified_gmt":"2020-12-10T02:34:09","slug":"molten-metal-filter","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/molten-metal-filter\/","title":{"rendered":"Filtro para metal fundido"},"content":{"rendered":"<p>Os filtros cer\u00e2micos porosos apresentam uma estrutura porosa semelhante a uma rede de poros abertos (espuma cer\u00e2mica) interconectados tridimensionalmente, etc., na qual a forma cer\u00e2mica \u00e9 preferencialmente utilizada como material filtrante para metal fundido.<\/p>\n<p>O <a href=\"http:\/\/www.alalloycasting.com\/pt\/porous-ceramic-filter\/\">filtro cer\u00e2mico poroso<\/a> \u00c9 preparado por meio do revestimento de uma pasta cer\u00e2mica sobre uma espuma de poliuretano flex\u00edvel de malha n\u00e3o celular, utilizada como material de base, e, em seguida, por carboniza\u00e7\u00e3o para eliminar a espuma de poliuretano por sinteriza\u00e7\u00e3o. A camada met\u00e1lica \u00e9 aplicada ao corpo cer\u00e2mico poroso, cobrindo toda a superf\u00edcie da estrutura reticular do corpo cer\u00e2mico poroso. O corpo cer\u00e2mico poroso possui poros abertos interconectados tridimensionalmente, apresentando essencialmente a mesma estrutura de poros que a espuma de poliuretano reticulada. A cavidade cont\u00ednua \u00e9 formada por espuma no interior do esqueleto, correspondendo ao substrato de espuma de poliuretano. As aberturas constituem o canal met\u00e1lico para a fus\u00e3o.<\/p>\n<p>No caso de se utilizar uma estrutura cer\u00e2mica porosa composta principalmente pelo corpo cer\u00e2mico poroso acima mencionado como filtro de metal fundido, a densidade aparente do corpo cer\u00e2mico poroso deve, de prefer\u00eancia, situar-se entre 0,3 e 0,6, o que resulta em uma estrutura cer\u00e2mica porosa com elevadas propriedades mec\u00e2nicas e resist\u00eancia mec\u00e2nica. A resist\u00eancia t\u00e9rmica pode ser obtida com qualidade suficientemente alta para suportar o uso do metal como filtro de metal fundido em altas temperaturas. Para uma estrutura cer\u00e2mica porosa composta principalmente por um corpo cer\u00e2mico poroso, tamb\u00e9m \u00e9 desej\u00e1vel que o di\u00e2metro m\u00e9dio das aberturas interconectadas tridimensionalmente ap\u00f3s a forma\u00e7\u00e3o da camada met\u00e1lica seja de 0,3 a 5 mm, e que elas sejam formadas de modo a n\u00e3o apresentar entupimento significativo em nenhuma delas. Al\u00e9m disso, ao definir a porosidade da estrutura cer\u00e2mica porosa entre 75% e 95%, \u00e9 poss\u00edvel obter uma alta taxa de fluxo e resist\u00eancia suficiente.<\/p>\n<p>A estrutura cer\u00e2mica porosa inclui, preferencialmente, aqueles materiais compostos principalmente por di\u00f3xido de sil\u00edcio, \u00f3xido de alum\u00ednio e \u00f3xido de magn\u00e9sio, que s\u00e3o sinterizados a uma temperatura superior a 1.300 \u00b0C e apresentam um ponto de amolecimento superior a 1.250 \u00b0C. A estrutura cer\u00e2mica porosa, quando pr\u00e9-aquecida a uma temperatura pr\u00f3xima \u00e0 do metal fundido a ser filtrado por ela, \u00e9 capaz de suportar adequadamente o choque t\u00e9rmico e de resistir ao choque t\u00e9rmico durante a opera\u00e7\u00e3o de filtragem.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6925\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/12\/Molten-Metal-Filter.jpg\" alt=\"Filtro para metal fundido\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Molten-Metal-Filter.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Molten-Metal-Filter-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Na estrutura cer\u00e2mica porosa, um corpo cer\u00e2mico poroso, como a espuma cer\u00e2mica, \u00e9 formado na superf\u00edcie da parede do poro pelo qual o fluido pode passar, com uma camada met\u00e1lica, de modo que o fluido flua atrav\u00e9s da camada met\u00e1lica enquanto entra em contato com ela. Nesse caso, o tipo de metal que forma a camada met\u00e1lica n\u00e3o \u00e9 particularmente limitado, podendo ser selecionado adequadamente de acordo com a finalidade de uso. No caso em que o metal fundido a ser filtrado seja alum\u00ednio, cobre ou ferro, a camada met\u00e1lica de revestimento \u00e9 preferencialmente selecionada entre platina, ouro, prata, cobre, estanho, lat\u00e3o, bronze e n\u00edquel. Ao utilizar esses metais de acordo com o metal fundido a ser filtrado, \u00e9 poss\u00edvel minimizar a lixivia\u00e7\u00e3o de impurezas met\u00e1licas sol\u00faveis presentes nele, o que resultaria em uma diminui\u00e7\u00e3o da qualidade do metal fundido filtrado. No processo em que o metal fundido passa pelas aberturas interconectadas, as impurezas sol\u00faveis e as impurezas s\u00f3lidas incorporadas s\u00e3o filtradas.<\/p>\n<p>Como a camada met\u00e1lica \u00e9 depositada de forma a cobrir toda a superf\u00edcie das paredes dos poros da estrutura cer\u00e2mica porosa pela qual o fluido pode passar, quando o metal fundido atravessa os poros do filtro, a resist\u00eancia ao fluxo do metal fundido \u00e9 reduzida. Portanto, o tempo entre a introdu\u00e7\u00e3o do metal fundido na entrada do filtro e o in\u00edcio da filtra\u00e7\u00e3o pode ser significativamente reduzido, e a filtra\u00e7\u00e3o pode ser iniciada de forma satisfat\u00f3ria mesmo que a queda de press\u00e3o inicial seja reduzida. Al\u00e9m disso, devido \u00e0 melhoria da umectabilidade, o fluxo local do metal fundido dentro do filtro \u00e9 eliminado.<\/p>","protected":false},"excerpt":{"rendered":"<p>The porous ceramic filters have a three-dimensionally interconnected open-pore (ceramic foam) network-like pore structure, etc., in which the ceramic form is preferably used as a&hellip;<\/p>","protected":false},"author":1,"featured_media":6924,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[127,128,645,378,4122,4121,430,753,164,4682,653,426,4123,487,379,221,664,7287,4124,241,418,1679,416,88,484,412,341,7288,298,756,409,754],"class_list":["post-6923","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-alumina-foam-ceramic-filter","tag-alumina-foam-ceramics","tag-aluminium-alloys-filtration","tag-ceramic-filter-for-aluminum-foundry","tag-ceramic-filter-for-foundry-for-sale","tag-ceramic-filter-for-sale","tag-ceramic-filter-media","tag-ceramic-foam-casting-filter","tag-ceramic-foam-filter-for-aluminum-casting","tag-ceramic-foam-filter-for-casting","tag-ceramic-foam-filter-manufacturer","tag-ceramic-foam-filter-manufacturing-process","tag-ceramic-foam-filter-purchasing","tag-cff-filter","tag-cff-filtration-mechanism","tag-filtering-function","tag-filtration-in-foundries","tag-filtration-method","tag-foam-ceramic-casting-filter","tag-foam-ceramic-material","tag-foundry-ceramic-filters","tag-high-grade-ceramic-foam-filters","tag-honeycomb-ceramic-filter","tag-how-to-use-the-molten-aluminum-filter","tag-liquid-aluminum-filter","tag-metal-foam-filter","tag-molten-aluminum-cff-filter","tag-molten-metal-filters-for-metallurgical-industry","tag-porous-ceramic-filter","tag-porous-ceramic-filtering-technology","tag-porous-ceramic-plate","tag-porous-foam-ceramic-materials"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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