{"id":6805,"date":"2020-12-02T08:38:43","date_gmt":"2020-12-02T08:38:43","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6805"},"modified":"2020-12-02T08:38:43","modified_gmt":"2020-12-02T08:38:43","slug":"ceramic-foam-filters-for-aluminium-casting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/ceramic-foam-filters-for-aluminium-casting\/","title":{"rendered":"Filtros de espuma cer\u00e2mica para fundi\u00e7\u00e3o de alum\u00ednio"},"content":{"rendered":"

A purifica\u00e7\u00e3o do metal fundido desempenha um papel importante na melhoria das propriedades mec\u00e2nicas das pe\u00e7as fundidas. Atualmente, o dispositivo de filtragem utilizado para purificar o metal fundido consiste principalmente em filtros de espuma cer\u00e2mica para fundi\u00e7\u00e3o de alum\u00ednio, que podem interceptar com efic\u00e1cia as impurezas nocivas presentes no metal fundido, converter o fluxo turbulento do metal fundido em fluxo laminar e remover completamente as impurezas de grande porte do metal fundido. Al\u00e9m disso, remove inclus\u00f5es finas, melhora a estrutura da matriz, reduz efetivamente o g\u00e1s e os elementos nocivos no metal l\u00edquido e purifica e homogene\u00edza o metal l\u00edquido.<\/p>\n

Os filtros de espuma cer\u00e2mica para fundi\u00e7\u00e3o de alum\u00ednio apresentam bom desempenho em altas temperaturas e s\u00e3o capazes de filtrar o alum\u00ednio l\u00edquido sem contaminar a liga; al\u00e9m disso, possuem boa porosidade transversal, o que lhes confere boas propriedades de filtra\u00e7\u00e3o e adsor\u00e7\u00e3o. \u00c9 obtida a capacidade de reten\u00e7\u00e3o de inclus\u00f5es de \u00f3xido e de fluxo na solu\u00e7\u00e3o met\u00e1lica. Possui bons efeitos de filtragem e purifica\u00e7\u00e3o, al\u00e9m de excelente resist\u00eancia a altas temperaturas, estabilidade ao choque t\u00e9rmico e resist\u00eancia qu\u00edmica. Ao mesmo tempo, o filtro de espuma cer\u00e2mica<\/a> possui um processo de fabrica\u00e7\u00e3o simples e permite a produ\u00e7\u00e3o de produtos filtrantes de tamanhos maiores.<\/p>\n

Filtros de espuma cer\u00e2mica para o processo de fabrica\u00e7\u00e3o de pe\u00e7as fundidas de alum\u00ednio<\/strong><\/p>\n

A espuma org\u00e2nica \u00e9 um material de malha aberta que permite que a pasta cer\u00e2mica passe livremente e se adhira entre si, sendo depois queimada para formar um esqueleto poroso.<\/p>\n

Quando o ve\u00edculo l\u00edquido \u00e9 a \u00e1gua, a espuma org\u00e2nica ser\u00e1 hidrof\u00edlica, de modo a ser firmemente absorvida pela pasta cer\u00e2mica. A espuma org\u00e2nica \u00e9 geralmente uma esponja polim\u00e9rica preparada por um m\u00e9todo de espuma\u00e7\u00e3o. O material da espuma org\u00e2nica pode ser poliuretano, cloreto de polivinila, poliestireno, l\u00e1tex ou celulose.<\/p>\n

Corte a espuma org\u00e2nica em blocos de um determinado tamanho ou em outras formas desejadas. A espuma org\u00e2nica pode ser pr\u00e9-tratada antes do revestimento. Por exemplo, a espuma org\u00e2nica \u00e9 aquecida ou hidrolisada para remover a pel\u00edcula superficial, garantindo que os poros n\u00e3o fiquem obstru\u00eddos e, assim, aumentando a porosidade. Ap\u00f3s a hidr\u00f3lise, ela \u00e9 esfregada repetidamente e lavada com \u00e1gua, sendo depois seca ao ar para uso posterior.<\/p>\n

\"Filtros<\/p>\n

Geralmente, antes do banho de pasta, a espuma org\u00e2nica precisa ser extrudada repetidamente para remover o ar, e s\u00f3 ent\u00e3o \u00e9 realizado o banho de pasta. A pasta pode ser impregnada pelo m\u00e9todo de adsor\u00e7\u00e3o atmosf\u00e9rica, pelo m\u00e9todo de adsor\u00e7\u00e3o a v\u00e1cuo, pelo m\u00e9todo de lamina\u00e7\u00e3o mec\u00e2nica ou pelo m\u00e9todo de fric\u00e7\u00e3o manual.<\/p>\n

A impregna\u00e7\u00e3o por pasta \u00e9 a impregna\u00e7\u00e3o por rolo. Por exemplo, a pasta formulada \u00e9 aplicada \u00e0 esponja de espuma de poliuretano cortada por meio de rolos, a fim de formar pelo menos um revestimento refrat\u00e1rio.<\/p>\n

A impregna\u00e7\u00e3o com pasta pode ser realizada uma, duas ou mais vezes. De prefer\u00eancia, a imers\u00e3o na pasta \u00e9 repetida v\u00e1rias vezes at\u00e9 que o ar interno seja completamente removido. A espuma org\u00e2nica impregnada \u00e9 extrudada para remover o excesso de pasta cer\u00e2mica, de modo a revestir uniformemente a estrutura em rede da espuma com a pasta, e o excesso de pasta \u00e9 posteriormente extrudado para formar um corpo verde.<\/p>\n

O corpo verde poroso revestido precisa ser seco. A secagem pode ser feita em local fresco, com ar quente, por infravermelho ou por micro-ondas. O material revestido \u00e9 seco a uma temperatura mais elevada, como 100-200 \u00b0C, para remover todos os compostos vol\u00e1teis remanescentes. O teor de umidade ap\u00f3s a secagem \u00e9 mantido dentro de 1%. A temperatura de sinteriza\u00e7\u00e3o \u00e9 de 1.000 a 1.600 \u00b0C. A sinteriza\u00e7\u00e3o \u00e9 realizada a 1.300 \u00b0C ao ar.<\/p>","protected":false},"excerpt":{"rendered":"

The purification of metal liquid plays an important role in improving the mechanical properties of castings. At present, the filtering device used to purify the…<\/p>","protected":false},"author":1,"featured_media":6806,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[7315,7316,7310,7304,7302,7301,7298,7313,7293,7320,7292,7291,7303,7306,7314,7309,7294,7307,7319,7311,7297,7300,7308,7295,7305,7299,7318,7312,7296,7317],"class_list":["post-6805","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-20-ppi-filter-foam-molten-aluminium-filtration","tag-30-ppi-filter-foam-molten-aluminium-filtration","tag-alumina-filter-molten-aluminium-filtration","tag-aluminum-casting-filter-molten-aluminium-filtration","tag-asian-foundry-filters-molten-aluminium-filtration","tag-casting-filter-molten-aluminium-filtration","tag-ceramic-disc-filter-molten-aluminium-filtration","tag-ceramic-filter-foundry-molten-aluminium-filtration","tag-ceramic-filter-molten-aluminium-filtration","tag-ceramic-filter-price-molten-aluminium-filtration","tag-ceramic-foam-filter-molten-aluminium-filtration","tag-ceramic-foam-filters-for-casting-molten-aluminium-filtration","tag-ceramic-foundry-filter-molten-aluminium-filtration","tag-filter-foam-molten-aluminium-filtration","tag-filter-foundry-molten-aluminium-filtration","tag-filter-molten-aluminium-filtration","tag-foam-ceramic-filter-molten-aluminium-filtration","tag-foam-filter-molten-aluminium-filtration","tag-foam-furnace-filter-molten-aluminium-filtration","tag-foundry-ceramic-filters-molten-aluminium-filtration","tag-foundry-coatings-molten-aluminium-filtration","tag-foundry-filter-molten-aluminium-filtration","tag-foundry-filters-molten-aluminium-filtration","tag-lanik-ceramic-foam-filters-molten-aluminium-filtration","tag-metal-foam-filter-molten-aluminium-filtration","tag-molten-metal-filtration-molten-aluminium-filtration","tag-open-cell-foam-filter-material-molten-aluminium-filtration","tag-porous-ceramic-filter-molten-aluminium-filtration","tag-porous-filter-material-molten-aluminium-filtration","tag-reticulated-foam-filter-molten-aluminium-filtration"],"yoast_head":"\nCeramic Foam Filters For Aluminium Casting - 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