{"id":5490,"date":"2020-10-12T06:56:32","date_gmt":"2020-10-12T06:56:32","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5490"},"modified":"2020-10-12T06:57:23","modified_gmt":"2020-10-12T06:57:23","slug":"aluminum-rotary-degassing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminum-rotary-degassing\/","title":{"rendered":"Desgaseamento rotativo de alum\u00ednio"},"content":{"rendered":"

Como o arg\u00f4nio \u00e9 um g\u00e1s inerte e n\u00e3o reage com o alum\u00ednio fundido, ele pode substituir o hidrog\u00eanio na massa fundida de alum\u00ednio, reduzindo significativamente o teor de hidrog\u00eanio na massa fundida e melhorando as propriedades mec\u00e2nicas da liga de alum\u00ednio. O grau de porosidade do alum\u00ednio processado por desgaseifica\u00e7\u00e3o rotativa pode atingir o padr\u00e3o de primeiro n\u00edvel da norma nacional.<\/p>\n

Na produ\u00e7\u00e3o, para detectar rapidamente o efeito da remo\u00e7\u00e3o de hidrog\u00eanio do alum\u00ednio fundido, costuma-se utilizar o m\u00e9todo de compara\u00e7\u00e3o do \u00edndice de densidade. Consiste em determinar a densidade \u03c1 verdadeira da amostra solidificada a v\u00e1cuo e a densidade \u03c1 positiva da amostra solidificada ao ar. \u00cdndice de densidade = (1 \u2013 \u03c1verdadeira \/ \u03c1positiva) \u00d7 100. Geralmente, o \u00edndice de densidade do alum\u00ednio fundido para fundi\u00e7\u00e3o sob press\u00e3o \u00e9 inferior a 1,5; o \u00edndice de densidade para fundi\u00e7\u00e3o a baixa press\u00e3o e fundi\u00e7\u00e3o por gravidade \u00e9 inferior a 1, o que \u00e9 considerado dentro dos padr\u00f5es de qualidade para o alum\u00ednio fundido.<\/p>\n

\"Desgaseamento<\/p>\n

Desgaseamento rotativo de alum\u00ednio<\/h2>\n

No processo de desgaseifica\u00e7\u00e3o rotativa do alum\u00ednio, quanto mais numerosas e finas forem as bolhas de arg\u00f4nio, maior ser\u00e1 a \u00e1rea de contato do alum\u00ednio fundido com as bolhas, menor ser\u00e1 a dist\u00e2ncia de difus\u00e3o dos \u00e1tomos de hidrog\u00eanio no alum\u00ednio fundido, mais tempo as bolhas permanecer\u00e3o no alum\u00ednio fundido e melhor ser\u00e1 o efeito de desgaseifica\u00e7\u00e3o.<\/p>\n

Durante o refino de alum\u00ednio<\/a> Durante o processo, o bico de grafite gira e pulveriza na parte inferior do alum\u00ednio fundido. Por um lado, isso promove o ac\u00famulo de pequenas inclus\u00f5es no alum\u00ednio fundido dentro do saco de transfer\u00eancia. Por outro lado, a superf\u00edcie do alum\u00ednio fundido permanece sempre est\u00e1vel. N\u00e3o h\u00e1 turbul\u00eancia violenta, evita-se a mistura de oxig\u00eanio e reduz-se a gera\u00e7\u00e3o de inclus\u00f5es de \u00f3xido e a dissolu\u00e7\u00e3o secund\u00e1ria de hidrog\u00eanio.<\/p>\n

O Ar \u00e9 um g\u00e1s inerte, n\u00e3o t\u00f3xico, ins\u00edpido, livre de polui\u00e7\u00e3o e n\u00e3o requer equipamentos de tratamento de gases residuais. A remo\u00e7\u00e3o de hidrog\u00eanio com Ar visa principalmente a remo\u00e7\u00e3o f\u00edsica do hidrog\u00eanio da massa fundida de alum\u00ednio, e seu uso n\u00e3o acarreta o risco de inclus\u00e3o de fundente. A esc\u00f3ria formada \u00e9 retirada do alum\u00ednio fundido por meio de bolhas. Em compara\u00e7\u00e3o com a purifica\u00e7\u00e3o por fundente, a forma\u00e7\u00e3o de esc\u00f3ria \u00e9 reduzida e n\u00e3o h\u00e1 gera\u00e7\u00e3o de gases t\u00f3xicos, o que melhora significativamente o ambiente de trabalho e reduz os danos ao meio ambiente.<\/p>","protected":false},"excerpt":{"rendered":"

Since argon is an inert gas and does not react with molten aluminum, it can replace the hydrogen in the aluminum melt, greatly reducing the…<\/p>","protected":false},"author":1,"featured_media":5491,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5490","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nAluminum Rotary Degassing by AdTech Degassing Unit<\/title>\n<meta name=\"description\" content=\"The pinhole degree of the solution processed by aluminum rotary degassing method can reach the first-level standard of the national standard.\" \/>\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\/aluminum-rotary-degassing\/\" \/>\n<meta property=\"og:locale\" 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