{"id":2914,"date":"2020-07-18T03:57:11","date_gmt":"2020-07-18T03:57:11","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=2914"},"modified":"2020-10-19T05:57:43","modified_gmt":"2020-10-19T05:57:43","slug":"aluminum-alloy-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminum-alloy-refining\/","title":{"rendered":"Refinamento de ligas de alum\u00ednio"},"content":{"rendered":"

A pr\u00e1tica na produ\u00e7\u00e3o de ligas de alum\u00ednio comprovou que o hidrog\u00eanio \u00e9 o \u00fanico g\u00e1s que pode ser dissolvido em grande quantidade no alum\u00ednio ou em ligas de alum\u00ednio, al\u00e9m de ser o g\u00e1s mais sol\u00favel nas ligas de alum\u00ednio. Portanto, o refinamento da liga de alum\u00ednio \u00e9 uma etapa importante. Ao fundir ligas de alum\u00ednio, o agente de refino deve ser adicionado na propor\u00e7\u00e3o adequada. O agente de refino \u00e9 geralmente 0,3% de liga de alum\u00ednio. O tempo de desgaseifica\u00e7\u00e3o n\u00e3o \u00e9 suficiente. Utiliza-se um tubo de a\u00e7o sem costura. O agente de limpeza \u00e9 pulverizado com nitrog\u00eanio ou arg\u00f4nio a 20 cm abaixo do fundo do alum\u00ednio l\u00edquido. Ap\u00f3s a limpeza e a pulveriza\u00e7\u00e3o, injeta-se nitrog\u00eanio ou arg\u00f4nio por mais 15 a 20 minutos. Ap\u00f3s a limpeza, o material repousa por 10 a 15 minutos, a esc\u00f3ria de alum\u00ednio \u00e9 removida e o material \u00e9 vertido com um filtro de espuma cer\u00e2mica<\/a>.<\/p>\n

\"Refinamento<\/p>\n

V\u00e1rios metais n\u00e3o ferrosos destinados \u00e0 fundi\u00e7\u00e3o apresentam a caracter\u00edstica de absorver g\u00e1s. O l\u00edquido da liga, durante o processo de fus\u00e3o ou manuten\u00e7\u00e3o do calor, aumenta rapidamente a solubilidade do g\u00e1s absorvido \u00e0 medida que a temperatura da liga aumenta. Portanto, al\u00e9m de controlar corretamente todo o processo de fundi\u00e7\u00e3o e vazamento, a liga l\u00edquida deve ser mantida o mais baixa poss\u00edvel em alta temperatura para evitar o superaquecimento da liga l\u00edquida. Para ligas que absorvem g\u00e1s facilmente, deve-se adotar a fundi\u00e7\u00e3o sob a prote\u00e7\u00e3o de um agente de cobertura. Somente dessa forma \u00e9 poss\u00edvel evitar bolhas de ar e poros min\u00fasculos.<\/p>\n

Para reduzir a oxida\u00e7\u00e3o da liga de alum\u00ednio, al\u00e9m de selecionar o forno adequado para a fus\u00e3o, deve-se utilizar o forno de manuten\u00e7\u00e3o para a preserva\u00e7\u00e3o do calor na produ\u00e7\u00e3o de fundi\u00e7\u00e3o sob press\u00e3o. Evite a fus\u00e3o e a produ\u00e7\u00e3o por fundi\u00e7\u00e3o sob press\u00e3o, reduza a agita\u00e7\u00e3o ao m\u00e1ximo, mantenha a pel\u00edcula de \u00f3xido l\u00edquido intacta, evite o superaquecimento desnecess\u00e1rio da liga l\u00edquida e reduza ao m\u00e1ximo o tempo de perman\u00eancia da liga no forno de manuten\u00e7\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminum alloy production practice has proved that hydrogen is the only gas that can be dissolved in a large amount in aluminum or aluminum alloy,…<\/p>","protected":false},"author":1,"featured_media":5755,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[1470],"class_list":["post-2914","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-aluminum-alloy-refining"],"yoast_head":"\nAluminum Alloy Refining,Refining Agent-sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"After aluminum alloy refining, it is sedated for 10-15 minutes, the aluminum slag is stripped off, and poured with a ceramic foam filter.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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