{"id":6902,"date":"2020-12-09T08:52:25","date_gmt":"2020-12-09T08:52:25","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6902"},"modified":"2020-12-09T08:52:25","modified_gmt":"2020-12-09T08:52:25","slug":"filters-for-aluminum-filtration","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/filters-for-aluminum-filtration\/","title":{"rendered":"Filtros para filtragem de alum\u00ednio"},"content":{"rendered":"<p>Atualmente, existem cinco tipos principais de filtros utilizados para a filtragem de alum\u00ednio. S\u00e3o eles: malha de arame tecida com fibra de vidro ou cer\u00e2mica; leito compactado de part\u00edculas de alumina n\u00e3o combinadas, em forma de placa ou esf\u00e9ricas; filtro de espuma cer\u00e2mica; part\u00edculas de alumina aglutinadas em diversas formas; pe\u00e7a cer\u00e2mica extrudada. \u00c9 poss\u00edvel distinguir entre filtros descart\u00e1veis e filtros de uso m\u00faltiplo (filtros de tubo poroso, filtros descart\u00e1veis aquecidos). Filtros de leito e filtros de tubo poroso para <a href=\"http:\/\/www.alalloycasting.com\/pt\/molten-aluminum-filtration\/\">filtragem de alum\u00ednio<\/a> s\u00e3o frequentemente utilizadas para produtos de grande capacidade, de uma \u00fanica liga (ou em s\u00e9rie) (como corpos de latas, latas e folhas finas). Embora sejam adequadas para essas aplica\u00e7\u00f5es, elas n\u00e3o s\u00e3o economicamente vi\u00e1veis quando \u00e9 necess\u00e1rio substituir muitas ligas ou quando o espa\u00e7o dispon\u00edvel \u00e9 muito limitado.<\/p>\n<p>O filtro descart\u00e1vel atende \u00e0s necessidades de efici\u00eancia m\u00e9dia de filtragem, f\u00e1cil substitui\u00e7\u00e3o de ligas e tamanho compacto. A filtragem com espuma cer\u00e2mica \u00e9 um processo complementar aos m\u00e9todos existentes de processamento de metais e \u00e9 amplamente utilizada na fabrica\u00e7\u00e3o de lingotes e pe\u00e7as fundidas com formatos especiais. No caso destas \u00faltimas, quando colocado no canal de fluxo, ele n\u00e3o s\u00f3 previne inclus\u00f5es, mas tamb\u00e9m promove um preenchimento suave e sem turbul\u00eancias do molde, de modo que n\u00e3o ocorram reoxida\u00e7\u00e3o nem forma\u00e7\u00e3o de esc\u00f3ria a jusante do filtro.<\/p>\n<p>O filtro de espuma cer\u00e2mica (CFF) consiste em uma pe\u00e7a de espuma cer\u00e2mica de c\u00e9lula aberta com espessura e \u00e1rea de se\u00e7\u00e3o transversal vari\u00e1veis. Geralmente, ele apresenta um vazio interconectado de 85% em volume. A finura do filtro varia, geralmente entre 10, 20 e 30 ppi (poros por polegada linear), e h\u00e1 uma tend\u00eancia para poros finos (50, 60, 80 ppi). De acordo com testes, \u00e0 medida que o tamanho dos poros diminui, a efici\u00eancia e a confiabilidade do sistema de filtragem aumentam. Outra observa\u00e7\u00e3o interessante para a filtragem de metais muito puros \u00e9 que o filtro apresenta baixo desempenho para part\u00edculas de tamanho pequeno (15 a 30 m) em compara\u00e7\u00e3o com part\u00edculas na faixa de 30 a 60 m.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6904\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/12\/Filters-for-Aluminum-Filtration.jpg\" alt=\"Filtros para filtragem de alum\u00ednio\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Filters-for-Aluminum-Filtration.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Filters-for-Aluminum-Filtration-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Verificou-se que, no caso da areia grossa, a efici\u00eancia de filtragem do alum\u00ednio fundido pelos filtros de espuma cer\u00e2mica aumenta com a vaz\u00e3o, o tamanho do filtro e a baixa porosidade, enquanto que, no caso da areia fina, a efici\u00eancia aumenta \u00e0 medida que a vaz\u00e3o diminui.<\/p>\n<p>No canal intersticial, em condi\u00e7\u00f5es de fluxo est\u00e1tico, as part\u00edculas tamb\u00e9m ficam retidas na chamada \u201c\u00e1gua morta\u201d. Nesse local, desde que n\u00e3o causem interfer\u00eancia indevida no fluxo do metal, as inclus\u00f5es podem formar uma leve ades\u00e3o, um ac\u00famulo solto de mat\u00e9ria em suspens\u00e3o ou permanecer sem qualquer ades\u00e3o. A causa da libera\u00e7\u00e3o de part\u00edculas pode ser uma altera\u00e7\u00e3o na vaz\u00e3o ou vibra\u00e7\u00e3o. Portanto, a captura de part\u00edculas s\u00f3 pode ser controlada at\u00e9 certo ponto na faixa de 1 a 30 m\u00edcrons, e n\u00e3o se pode descartar o re-arrastamento das part\u00edculas capturadas. Essa incerteza pode explicar os riscos dessas part\u00edculas, mais do que seu tamanho. O filtro de espuma cer\u00e2mica pode ser instalado antes da esta\u00e7\u00e3o de fundi\u00e7\u00e3o com um investimento m\u00ednimo. No entanto, ele tem uma vida \u00fatil limitada, pois as inclus\u00f5es formar\u00e3o bolos de filtro durante o uso, aumentando assim a resist\u00eancia ao fluxo.<\/p>","protected":false},"excerpt":{"rendered":"<p>Currently, there are five main types of filters used for aluminum filtration. They are: glass or ceramic fiber woven wire mesh; uncombined plate-like or spherical&hellip;<\/p>","protected":false},"author":1,"featured_media":6903,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[1720,1722,4125,1724,4127,1705,1726,753,1447,1713,811,1702,1735,1712,1731,1714,1727,4124,1441,1728,1700,1701,1710,1605,1475,416,341,1723,7288,756,824,1446,754,1596,751,1709],"class_list":["post-6902","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-advanced-ceramic-filter","tag-alumina-ceramic-filter","tag-aluminum-alloy-casting-filter","tag-casting-ceramic-foam-filter","tag-ceramic-fiber-filters","tag-ceramic-filter-for-molten-aluminum","tag-ceramic-filter-manufacturing-process","tag-ceramic-foam-casting-filter","tag-ceramic-foam-filter-china","tag-ceramic-foam-filter-for-aluminum","tag-ceramic-foam-filter-plate","tag-ceramic-foam-filter-supplier","tag-ceramic-foam-filters-manufacturer","tag-ceramic-foam-filters-manufacturing-process","tag-ceramic-foam-filters-supplier","tag-ceramic-foam-filtration","tag-ceramic-foundry-filters","tag-foam-ceramic-casting-filter","tag-foam-ceramic-filter","tag-foam-ceramic-filter-manufacturing-process","tag-foam-ceramic-filter-plate","tag-foam-ceramic-filtration-mechanism","tag-foam-ceramics-applications","tag-foam-furnace-filter","tag-foundry-ceramic-filter","tag-honeycomb-ceramic-filter","tag-molten-aluminum-cff-filter","tag-molten-aluminum-filters","tag-molten-metal-filters-for-metallurgical-industry","tag-porous-ceramic-filtering-technology","tag-porous-ceramics-filtration","tag-porous-filter-material","tag-porous-foam-ceramic-materials","tag-silicon-carbide-ceramic-filter","tag-zirconia-foam-ceramic-filter","tag-zro2-ceramic-foam-filter"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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