{"id":8523,"date":"2021-04-25T08:42:16","date_gmt":"2021-04-25T08:42:16","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=8523"},"modified":"2021-04-25T08:42:16","modified_gmt":"2021-04-25T08:42:16","slug":"degassing-and-grain-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/degassing-and-grain-refining\/","title":{"rendered":"Desgaseifica\u00e7\u00e3o e refinamento de gr\u00e3os"},"content":{"rendered":"

O alum\u00ednio fundido \u00e9 geralmente submetido a um processo antes da fundi\u00e7\u00e3o para a remo\u00e7\u00e3o do hidrog\u00eanio dissolvido na massa fundida. Esse tratamento \u00e9 conhecido como desgaseifica\u00e7\u00e3o e refinamento de gr\u00e3o.<\/p>\n

Desgaseifica\u00e7\u00e3o e refinamento de gr\u00e3os<\/h2>\n

A desgaseifica\u00e7\u00e3o \u00e9 uma pr\u00e1tica comum para reduzir o teor de g\u00e1s hidrog\u00eanio no alum\u00ednio fundido e em suas ligas.<\/p>\n

Uma das primeiras pr\u00e1ticas de desgaseifica\u00e7\u00e3o consistiu em tratar a massa fundida (alum\u00ednio fundido\/liga de alum\u00ednio) com hexacloroetano. Nesse processo, a desgaseifica\u00e7\u00e3o \u00e9 realizada pelo g\u00e1s cloro, que se libera a partir da decomposi\u00e7\u00e3o do hexacloroetano durante sua passagem pela massa fundida.<\/p>\n

Com o objetivo de melhorar a efic\u00e1cia da remo\u00e7\u00e3o do hidrog\u00eanio, bem como para facilitar a opera\u00e7\u00e3o e conter os riscos ambientais; Desgaseifica\u00e7\u00e3o online<\/a> foi adotado pelo setor.<\/p>\n

Na desgaseifica\u00e7\u00e3o on-line, o nitrog\u00eanio ou um g\u00e1s inerte, como o arg\u00f4nio, \u00e9 injetado na massa fundida por meio de bicos rotativos especialmente projetados, o que permite que o hidrog\u00eanio dissolvido saia da massa fundida na forma de bolhas. Alguns equipamentos desse tipo dispon\u00edveis no mercado para essa finalidade s\u00e3o o SNIF, o LARS, etc.<\/p>\n

Nos desenvolvimentos posteriores, uma pequena porcentagem de cloro foi adicionada ao g\u00e1s de purga. Isso ajudou a melhorar a efic\u00e1cia do processo de desgaseifica\u00e7\u00e3o e, por isso, ganhou aceita\u00e7\u00e3o. No entanto, a adi\u00e7\u00e3o de cloro traz suas pr\u00f3prias complica\u00e7\u00f5es e riscos, al\u00e9m do custo.<\/p>\n

O refinamento de gr\u00e3os do alum\u00ednio e de suas ligas \u00e9 realizado com o objetivo de melhorar a microestrutura do produto fundido, de modo a aumentar a taxa de fundi\u00e7\u00e3o, a resist\u00eancia \u00e0 fissura\u00e7\u00e3o a quente e as propriedades mec\u00e2nicas, especialmente a tenacidade e a ductilidade, etc.<\/p>\n

Descrevendo resumidamente a metalurgia por tr\u00e1s do refinamento de gr\u00e3os, o Gain Refiner, quando introduzido no alum\u00ednio fundido e em suas ligas, aumenta o n\u00famero de locais dispon\u00edveis para a forma\u00e7\u00e3o de gr\u00e3os. Nessas condi\u00e7\u00f5es, formam-se mais gr\u00e3os, em detrimento do tamanho dos gr\u00e3os individuais. Assim, a microestrutura do material apresentar\u00e1 gr\u00e3os menores\/mais finos e, consequentemente, melhores propriedades mec\u00e2nicas.<\/p>","protected":false},"excerpt":{"rendered":"

Molten Aluminum is generally processed before casting for the removal of Hydrogen dissolved in the melt. This treatment is known as Degassing and Grain Refining.…<\/p>","protected":false},"author":1,"featured_media":8543,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-8523","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nDegassing and Grain Refining Molten Aluminum Alloy<\/title>\n<meta name=\"description\" content=\"Degassing and Grain Refining: Molten Aluminum is generally processed before casting for the removal of Hydrogen dissolved in the melt.\" \/>\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\/degassing-and-grain-refining\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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