{"id":8643,"date":"2021-04-30T03:16:49","date_gmt":"2021-04-30T03:16:49","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=8643"},"modified":"2021-04-30T03:16:49","modified_gmt":"2021-04-30T03:16:49","slug":"melting-aluminum-impurities-removal","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/melting-aluminum-impurities-removal\/","title":{"rendered":"Remo\u00e7\u00e3o de impurezas do alum\u00ednio fundido"},"content":{"rendered":"

A remo\u00e7\u00e3o de impurezas do alum\u00ednio fundido \u00e9 utilizada principalmente para purificar a liga l\u00edquida rec\u00e9m-fundida no processo de fundi\u00e7\u00e3o, a fim de reduzir ou eliminar os problemas decorrentes de diversas inclus\u00f5es n\u00e3o met\u00e1licas nesse processo. Os res\u00edduos de fundi\u00e7\u00e3o causados por defeitos, como inclus\u00f5es n\u00e3o met\u00e1licas, representam at\u00e9 50%-60% do total de res\u00edduos. \u00c0 medida que diversos custos aumentam, os danos causados pelo ambiente externo e o escoamento de res\u00edduos em excesso podem ser previstos; al\u00e9m disso, a presen\u00e7a de defeitos n\u00e3o apenas prejudica gravemente as propriedades mec\u00e2nicas e o desempenho da pe\u00e7a fundida, mas tamb\u00e9m tem um efeito prejudicial no processo de usinagem e na apar\u00eancia da pe\u00e7a.<\/p>\n

A remo\u00e7\u00e3o de impurezas de fundidos de alum\u00ednio geralmente utiliza espuma de poliuretano como suporte, imersa em uma pasta cer\u00e2mica composta por p\u00f3s finos, como agregados refrat\u00e1rios, ligantes e \u00e1gua; em seguida, o excesso de pasta ao redor das fibras da espuma \u00e9 espremido. Ap\u00f3s a secagem, tostagem e sinteriza\u00e7\u00e3o em alta temperatura dos materiais cer\u00e2micos, os produtos cer\u00e2micos espumados s\u00e3o finalmente formados.
\nComo a temperatura de fundi\u00e7\u00e3o da liga de fundi\u00e7\u00e3o \u00e9 diferente, a pe\u00e7a fundida deve ser feita de filtro de espuma cer\u00e2mica refrat\u00e1ria<\/a>. Nas \u00faltimas d\u00e9cadas, de acordo com as propriedades das diferentes ligas de materiais, filtros de espuma cer\u00e2mica de diversos materiais t\u00eam sido desenvolvidos sucessivamente, tanto no pa\u00eds quanto no exterior.<\/p>\n

A remo\u00e7\u00e3o de impurezas do alum\u00ednio fundido n\u00e3o s\u00f3 consegue eliminar com efic\u00e1cia um grande n\u00famero de impurezas estranhas presentes no alum\u00ednio l\u00edquido, como tamb\u00e9m filtrar pequenas inclus\u00f5es de alguns m\u00edcrons que n\u00e3o podem ser removidas por processos tradicionais. Como \u00edons nocivos, como os \u00e1tomos de hidrog\u00eanio no alum\u00ednio l\u00edquido, costumam ser adsorvidos nas inclus\u00f5es, e essas inclus\u00f5es podem se tornar o n\u00facleo da forma\u00e7\u00e3o de bolhas, \u00e9 poss\u00edvel reduzir os gases nocivos no alum\u00ednio l\u00edquido ao filtrar as inclus\u00f5es.<\/p>\n

\"Unidade<\/p>\n

Os fabricantes de elementos filtrantes de espuma cer\u00e2mica para alum\u00ednio fundido adotar\u00e3o um conjunto relativamente completo de medidas para garantir a estabilidade do produto e assegurar que a resist\u00eancia, a taxa de orif\u00edcios, as dimens\u00f5es geom\u00e9tricas, a qualidade da apar\u00eancia e as propriedades f\u00edsico-qu\u00edmicas do produto final atendam \u00e0s normas. Na produ\u00e7\u00e3o, para alcan\u00e7ar um melhor efeito de filtragem, o alum\u00ednio l\u00edquido a montante do filtro deve apresentar um certo grau de limpeza; ou seja, o alum\u00ednio l\u00edquido a montante pode ser tratado por meio de desidrogena\u00e7\u00e3o a g\u00e1s tradicional ou com fluxo.<\/p>\n

Se as medidas acima n\u00e3o forem adotadas, a filtragem e a purifica\u00e7\u00e3o de ligas de alum\u00ednio fundidas com alto teor de hidrog\u00eanio e oxig\u00eanio, muitas inclus\u00f5es n\u00e3o met\u00e1licas e de grandes dimens\u00f5es n\u00e3o apenas reduzir\u00e3o a efici\u00eancia da filtragem, mas tamb\u00e9m obstruir\u00e3o facilmente o filtro, resultando em aumento de custos e efeitos de purifica\u00e7\u00e3o insatisfat\u00f3rios.<\/p>\n

Ap\u00f3s as medidas acima, o teor de hidrog\u00eanio na liga fundida foi reduzido a um n\u00edvel muito baixo, e o tamanho das inclus\u00f5es de \u00f3xido na liga fundida tamb\u00e9m \u00e9 muito pequeno. Portanto, o uso de filtros de espuma de alum\u00ednio fundido pode remover com efic\u00e1cia as inclus\u00f5es de \u00f3xido finas e dispersas, melhorando assim a efici\u00eancia da filtra\u00e7\u00e3o e reduzindo os custos de filtra\u00e7\u00e3o e purifica\u00e7\u00e3o.<\/p>\n

Al\u00e9m disso, \u00e9 necess\u00e1rio proteger o alum\u00ednio l\u00edquido filtrado de alta qualidade contra polui\u00e7\u00e3o secund\u00e1ria; ou seja, os materiais refrat\u00e1rios a jusante da caixa de filtragem devem atender a padr\u00f5es mais rigorosos, e a camada de \u00f3xido superficial do alum\u00ednio l\u00edquido a jusante deve ser protegida.<\/p>","protected":false},"excerpt":{"rendered":"

Melting Aluminum Impurities Removal is mainly used to purify the as-cast alloy liquid in the casting process to reduce or eliminate the problems of various…<\/p>","protected":false},"author":1,"featured_media":8649,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-8643","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nMelting Aluminum Impurities Removal with Ceramic Foam Filter<\/title>\n<meta name=\"description\" content=\"Melting Aluminum Impurities Removal is mainly used to purify the as-cast alloy liquid in the casting process to reduce inclusions.\" \/>\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\/melting-aluminum-impurities-removal\/\" \/>\n<meta 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