{"id":7217,"date":"2020-12-25T03:27:53","date_gmt":"2020-12-25T03:27:53","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7217"},"modified":"2021-04-12T03:57:31","modified_gmt":"2021-04-12T03:57:31","slug":"molten-metal-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/molten-metal-refining\/","title":{"rendered":"Refinamento de metal fundido"},"content":{"rendered":"<p>No processo de refino e transporte do metal fundido, materiais estranhos, como esc\u00f3ria de \u00f3xido, compostos intermet\u00e1licos e fragmentos do forno, s\u00e3o facilmente incorporados ao metal fundido, formando inclus\u00f5es n\u00e3o met\u00e1licas. Essas inclus\u00f5es n\u00e3o met\u00e1licas s\u00e3o, principalmente, inclus\u00f5es de \u00f3xido. De acordo com o diferente per\u00edodo de forma\u00e7\u00e3o no processo de fus\u00e3o e fundi\u00e7\u00e3o, elas podem ser divididas em inclus\u00f5es de \u00f3xido prim\u00e1rias e inclus\u00f5es de \u00f3xido secund\u00e1rias.<\/p>\n<p>As inclus\u00f5es de \u00f3xido prim\u00e1rias referem-se principalmente a todas as inclus\u00f5es de \u00f3xido formadas antes do vazamento do alum\u00ednio fundido. As inclus\u00f5es de \u00f3xido prim\u00e1rias podem ser divididas em dois tipos, de acordo com suas formas: um deles s\u00e3o as inclus\u00f5es grandes, com distribui\u00e7\u00e3o irregular na macroestrutura. Esse tipo de inclus\u00e3o torna a estrutura da liga descont\u00ednua, reduz a estanqueidade da pe\u00e7a e se torna fonte de corros\u00e3o. Reduz significativamente a resist\u00eancia e a plasticidade das ligas de alum\u00ednio, e frequentemente se torna a causa de trincas nas pe\u00e7as. O segundo tipo de inclus\u00f5es de \u00f3xido refere-se a inclus\u00f5es pequenas e dispersas, que n\u00e3o podem ser completamente removidas mesmo ap\u00f3s uma purifica\u00e7\u00e3o cuidadosa. Elas aumentam a viscosidade do metal fundido e reduzem a capacidade de alimenta\u00e7\u00e3o do alum\u00ednio fundido durante a solidifica\u00e7\u00e3o, o que facilmente causa encolhimento das pe\u00e7as fundidas.<\/p>\n<p>As inclus\u00f5es de \u00f3xido secund\u00e1rias, tamb\u00e9m conhecidas como inclus\u00f5es end\u00f3genas, s\u00e3o formadas principalmente durante o processo de fundi\u00e7\u00e3o. Em geral, a distribui\u00e7\u00e3o das inclus\u00f5es end\u00f3genas \u00e9 relativamente uniforme e as part\u00edculas s\u00e3o relativamente pequenas. Os respingos e a turbul\u00eancia do alum\u00ednio fundido durante o processo de vazamento s\u00e3o as principais fontes de inclus\u00f5es secund\u00e1rias de \u00f3xido. No molde de areia, o alum\u00ednio fundido reage com a umidade da areia, e a \u00e1gua \u00e9 decomposta em oxig\u00eanio e hidrog\u00eanio. O oxig\u00eanio reage com o alum\u00ednio para formar inclus\u00f5es de \u00f3xido, e o hidrog\u00eanio se dissolve no alum\u00ednio fundido.<\/p>\n<p>Metal fundido <a href=\"http:\/\/www.alalloycasting.com\/pt\/refining-flux\/\">fluxo de refino<\/a> \u00e9 utilizado principalmente para a remo\u00e7\u00e3o de inclus\u00f5es de \u00f3xido prim\u00e1rio em fornos. <a href=\"http:\/\/www.alalloycasting.com\/pt\/ceramic-foam-filter-cff\/\">Filtro de espuma cer\u00e2mica<\/a> \u00c9 capaz de filtrar inclus\u00f5es no metal fundido, sendo utilizado principalmente para a remo\u00e7\u00e3o de inclus\u00f5es de \u00f3xido secund\u00e1rias.<\/p>","protected":false},"excerpt":{"rendered":"<p>In the process of refining and transportation of molten metal, foreign matter such as oxide scale, intermetallic compounds, and hearth fragments are easily brought into&hellip;<\/p>","protected":false},"author":1,"featured_media":7218,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-7217","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Molten Metal Refining with Flux and Ceramic Foam Filter<\/title>\n<meta name=\"description\" content=\"Molten metal refining flux is mainly used for primary oxide inclusions removal. Ceramic foam filter can filter inclusions in molten metal.\" \/>\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\/molten-metal-refining\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Molten Metal Refining with Flux and Ceramic Foam Filter\" \/>\n<meta property=\"og:description\" content=\"Molten metal refining flux is mainly used for primary oxide inclusions removal. 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