{"id":4549,"date":"2020-09-05T01:24:03","date_gmt":"2020-09-05T01:24:03","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4549"},"modified":"2020-09-05T01:24:03","modified_gmt":"2020-09-05T01:24:03","slug":"aluminium-alloy-melting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminium-alloy-melting\/","title":{"rendered":"Fus\u00e3o de ligas de alum\u00ednio"},"content":{"rendered":"<p>A fus\u00e3o de ligas de alum\u00ednio \u00e9 um processo no qual um s\u00f3lido se aquece e se transforma em um l\u00edquido fluido. Ap\u00f3s a conclus\u00e3o da alimenta\u00e7\u00e3o, a fus\u00e3o tem in\u00edcio. Durante o processo de fus\u00e3o, \u00e9 necess\u00e1rio garantir que a fus\u00e3o seja r\u00e1pida e uniforme, e que a temperatura pr\u00f3xima \u00e0 chama seja elevada, atingindo mais de 1.200 \u2103. Para evitar superaquecimento local e temperatura excessiva, a oxida\u00e7\u00e3o da liga de alum\u00ednio causar\u00e1 s\u00e9rios transtornos no refinamento posterior do produto. Deve-se realizar a agita\u00e7\u00e3o, e a carga do forno ainda n\u00e3o fundida deve ser empurrada para dentro do alum\u00ednio l\u00edquido, de modo que quase toda ela fique imersa na agita\u00e7\u00e3o, evitando assim o superaquecimento local. Para a imers\u00e3o final de Mg e outros elementos, a chama n\u00e3o pode aquecer e fundir diretamente; e, como o alum\u00ednio l\u00edquido est\u00e1 imerso na mat\u00e9ria-prima, a temperatura \u00e9 reduzida, e o Mg e outros elementos s\u00e3o fundidos a uma temperatura relativamente baixa, o que reduz a perda por queima e melhora a efici\u00eancia da combust\u00e3o.<\/p>\n<h2>Fus\u00e3o de ligas de alum\u00ednio<\/h2>\n<p>A liga de alum\u00ednio come\u00e7a a derreter a cerca de 600 \u2103 e derrete quando aquecida a 660 \u2103. A temperatura de fus\u00e3o n\u00e3o deve exceder 760 \u2103. Quando a temperatura de fus\u00e3o ultrapassa 770 \u2103, a liga de alum\u00ednio sofre oxida\u00e7\u00e3o grave; a absor\u00e7\u00e3o de hidrog\u00eanio e a inclus\u00e3o de esc\u00f3ria aumentam durante o processo de fus\u00e3o, e gr\u00e3os grosseiros surgem durante o processo de fundi\u00e7\u00e3o e solidifica\u00e7\u00e3o, o que reduz as propriedades mec\u00e2nicas. Para reduzir a oxida\u00e7\u00e3o da liga de alum\u00ednio durante o processo de fus\u00e3o, adiciona-se de 0,4% a 0,5% do agente de cobertura durante o processo de fus\u00e3o, a fim de proteger a pel\u00edcula de \u00f3xido de alum\u00ednio contra danos. O tipo de <a href=\"http:\/\/www.alalloycasting.com\/pt\/tundish-flux\/\">agente de cobertura<\/a>\u00a0\u00e9 semelhante \u00e0 composi\u00e7\u00e3o qu\u00edmica do agente de limpeza de esc\u00f3ria.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4554\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminium-Alloy-Melting-1.jpg\" alt=\"Fus\u00e3o de ligas de alum\u00ednio\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminium-Alloy-Melting-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminium-Alloy-Melting-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>A temperatura da fundi\u00e7\u00e3o da liga de alum\u00ednio \u00e9 mantida entre 720 e 760 \u2103. Ap\u00f3s a fus\u00e3o do lingote de alum\u00ednio, s\u00e3o adicionadas mat\u00e9rias-primas com pontos de fus\u00e3o mais elevados, como o elemento Si e <a href=\"http:\/\/www.alalloycasting.com\/pt\/aluminum-alloy-additives\/\">Agente Ti<\/a> s\u00e3o adicionados. O Ti forma n\u00facleos cristalinos heterog\u00eaneos na liga, o que contribui para refinar a estrutura e incorpor\u00e1-la ao alum\u00ednio l\u00edquido, a fim de reduzir a perda por queima. Depois que o lingote de alum\u00ednio estiver basicamente derretido, s\u00e3o adicionados elementos de liga, como Mg e Cu, que se queimam facilmente. Eles n\u00e3o podem ser adicionados muito cedo, para reduzir a perda por queima, nem muito tarde, o que afeta a difus\u00e3o e causa segrega\u00e7\u00e3o. Feche a porta do forno e continue a fundi\u00e7\u00e3o.<\/p>\n<p>Ap\u00f3s a conclus\u00e3o da fundi\u00e7\u00e3o, h\u00e1 uma grande quantidade de esc\u00f3ria na superf\u00edcie da liga de alum\u00ednio, composta principalmente por Al\u2082O\u2083 e outras inclus\u00f5es de \u00f3xidos. Essas inclus\u00f5es finas s\u00e3o mais pesadas que o alum\u00ednio l\u00edquido, mas, ap\u00f3s a agrega\u00e7\u00e3o e aglomera\u00e7\u00e3o, sua densidade se torna menor e elas flutuam na superf\u00edcie. \u00c9 necess\u00e1ria a remo\u00e7\u00e3o da esc\u00f3ria. A dosagem do agente de remo\u00e7\u00e3o de esc\u00f3ria \u00e9 adicionada na propor\u00e7\u00e3o de 0,2% a 0,5%; espalhe uniformemente sobre a superf\u00edcie do alum\u00ednio l\u00edquido e realize uma agita\u00e7\u00e3o superficial e uniforme. Coloque a esc\u00f3ria na porta do forno, feche a porta e deixe repousar; por um lado, o agente de limpeza de esc\u00f3ria tem um efeito de aquecimento, que pode derreter o alum\u00ednio l\u00edquido aderido \u00e0 esc\u00f3ria; por outro lado, ele pode separar efetivamente a esc\u00f3ria do alum\u00ednio l\u00edquido, o que \u00e9 ben\u00e9fico para a remo\u00e7\u00e3o da esc\u00f3ria. Ap\u00f3s repousar por alguns minutos, remova suavemente a esc\u00f3ria de alum\u00ednio pela porta do forno. A fus\u00e3o de ligas de alum\u00ednio \u00e9 um processo muito complexo. Devido \u00e0 perda por queima inconsistente dos diferentes elementos, ap\u00f3s a remo\u00e7\u00e3o da esc\u00f3ria, o alum\u00ednio l\u00edquido precisa ser amostrado para an\u00e1lise f\u00edsico-qu\u00edmica, a fim de garantir que cada elemento esteja dentro da faixa de transfer\u00eancia qualificada. Concha <a href=\"http:\/\/www.alalloycasting.com\/pt\/degassing-and-refining\/\">desgaseifica\u00e7\u00e3o e refino<\/a>, caso contr\u00e1rio, ele precisa ser ajustado corretamente.<\/p>","protected":false},"excerpt":{"rendered":"<p>Aluminium Alloy Melting is a process in which a solid heats up and becomes a fluid liquid. After the feeding is completed, melting starts. During&hellip;<\/p>","protected":false},"author":1,"featured_media":4555,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4657],"class_list":["post-4549","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminium-alloy-melting"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Aluminium Alloy Melting Temperature and Process in Furnace<\/title>\n<meta name=\"description\" content=\"Aluminium Alloy Melting is a process in which a solid heats up and becomes a fluid liquid. 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