{"id":2950,"date":"2020-07-20T09:13:44","date_gmt":"2020-07-20T09:13:44","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=2950"},"modified":"2020-10-19T06:06:01","modified_gmt":"2020-10-19T06:06:01","slug":"cast-aluminum-alloys","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/cast-aluminum-alloys\/","title":{"rendered":"Ligas de alum\u00ednio fundido"},"content":{"rendered":"<p>As ligas de alum\u00ednio s\u00e3o classificadas em ligas de alum\u00ednio deformadas e ligas de alum\u00ednio fundidas, de acordo com suas aplica\u00e7\u00f5es. As ligas de alum\u00ednio forjadas incluem portas e janelas de liga de alum\u00ednio de uso cotidiano e materiais para mecanismos de \u00f4nibus espaciais, que podem ou n\u00e3o ser submetidas a tratamento t\u00e9rmico, de acordo com diferentes requisitos de uso; o outro tipo s\u00e3o as ligas de alum\u00ednio fundidas, incluindo principalmente ligas de alum\u00ednio-sil\u00edcio, <a href=\"http:\/\/www.alalloycasting.com\/pt\/cast-aluminum-alloys\/\">liga de alum\u00ednio e cobre<\/a>e ligas de alum\u00ednio-magn\u00e9sio, liga de alum\u00ednio-zinco e liga de alum\u00ednio com terras raras, etc.<\/p>\n<p>No processo de produ\u00e7\u00e3o propriamente dito, as ligas de alum\u00ednio fundido s\u00e3o classificadas de acordo com o teor de diversos elementos qu\u00edmicos. O processo de fundi\u00e7\u00e3o requer a adi\u00e7\u00e3o ou redu\u00e7\u00e3o da quantidade de mat\u00e9rias-primas, de acordo com a composi\u00e7\u00e3o qu\u00edmica real.<\/p>\n<p>Utilizando lingotes de alum\u00ednio puro como mat\u00e9ria-prima, o processo de fundi\u00e7\u00e3o ajusta a composi\u00e7\u00e3o qu\u00edmica de acordo com as necessidades reais de produ\u00e7\u00e3o. \u00c9 poss\u00edvel fundir diferentes tipos de liga de alum\u00ednio na forma l\u00edquida e adaptar-se \u00e0s necessidades de diversos produtos, abrangendo v\u00e1rios tipos de produtos. Antes da fundi\u00e7\u00e3o da liga de alum\u00ednio, a composi\u00e7\u00e3o deve ser definida de acordo com os requisitos. A composi\u00e7\u00e3o deve basear-se nos tipos de liga, e \u00e9 preciso levar em considera\u00e7\u00e3o a queima de v\u00e1rios elementos no processo de fundi\u00e7\u00e3o do material novo, do material reciclado e da liga-m\u00e3e.<\/p>\n<p>O m\u00e9todo de fundi\u00e7\u00e3o mais econ\u00f4mico e comum na fundi\u00e7\u00e3o de ligas de alum\u00ednio \u00e9 a fundi\u00e7\u00e3o em forno a g\u00e1s, que exige: fus\u00e3o r\u00e1pida, tempo curto e menor absor\u00e7\u00e3o de ar. A ordem de alimenta\u00e7\u00e3o n\u00e3o afeta apenas a efici\u00eancia da fus\u00e3o e o consumo da liga, mas tamb\u00e9m influencia diretamente a qualidade do alum\u00ednio fundido. O princ\u00edpio de alimenta\u00e7\u00e3o \u00e9: primeiro o pequeno, depois o grande; primeiro o que derrete mais facilmente e depois o que derrete com mais dificuldade; primeiro o que queima menos, depois o que queima mais facilmente e, por fim, o que se deteriora.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5762\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/07\/Cast-Aluminum-Alloys.jpg\" alt=\"Ligas de alum\u00ednio fundido\" width=\"400\" height=\"320\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/Cast-Aluminum-Alloys.jpg 400w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/Cast-Aluminum-Alloys-300x240.jpg 300w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<p>Primeiro, adicionam-se pequenos peda\u00e7os de material de reaquecimento, lingotes de liga de alum\u00ednio com ponto de fus\u00e3o mais baixo (como a liga Al-Si) e, em seguida, lingotes de alum\u00ednio com maior volume e ponto de fus\u00e3o mais alto, al\u00e9m de ligas intermedi\u00e1rias (como Al-Mn), Mg, etc. \u2014 os elementos que queimam mais facilmente s\u00e3o adicionados por \u00faltimo. Os pequenos peda\u00e7os de material reciclado s\u00e3o colocados primeiro no fundo do forno para proteger o corpo do forno e reduzir o impacto na parede do forno quando os peda\u00e7os maiores de carga s\u00e3o introduzidos. Al\u00e9m disso, como o material reciclado tem baixo ponto de fus\u00e3o e \u00e9 f\u00e1cil de derreter, a efici\u00eancia de fus\u00e3o pode ser melhorada quando as mat\u00e9rias-primas com pontos de fus\u00e3o mais elevados s\u00e3o derretidas posteriormente. Adicione Mg para diminuir a temperatura e reduzir a perda por queima.<\/p>\n<p>A fus\u00e3o \u00e9 um processo no qual um s\u00f3lido \u00e9 aquecido at\u00e9 se transformar em um l\u00edquido com fluidez. Ap\u00f3s a conclus\u00e3o da alimenta\u00e7\u00e3o, inicia-se a fus\u00e3o. Durante o processo de fus\u00e3o, certifique-se de que a fus\u00e3o seja r\u00e1pida e uniforme e que a temperatura pr\u00f3xima \u00e0 chama seja mais elevada, atingindo 1.200 \u2103 ou mais. Para evitar superaquecimento local e altas temperaturas, uma oxida\u00e7\u00e3o grave da liga de alum\u00ednio causar\u00e1 transtornos no refinamento posterior do produto. A agita\u00e7\u00e3o deve ser realizada durante o processo de fus\u00e3o, e a carga n\u00e3o fundida deve ser empurrada para dentro do alum\u00ednio fundido, de modo a ficar quase completamente imersa e agitada uniformemente, evitando assim o superaquecimento local. Para os \u00faltimos elementos imersos, como o Mg, a chama n\u00e3o pode aquec\u00ea-los e derret\u00ea-los diretamente. Como o alum\u00ednio l\u00edquido est\u00e1 imerso nas mat\u00e9rias-primas, a temperatura \u00e9 reduzida, e os elementos como o Mg s\u00e3o mantidos para derreter a uma temperatura relativamente baixa, o que reduz a perda por queima e melhora a efici\u00eancia da combust\u00e3o.<\/p>\n<p>A liga de alum\u00ednio come\u00e7a a derreter a cerca de 600 \u2103, e a temperatura \u00e9 elevada a 660 \u2103 para que a fus\u00e3o seja completa; a temperatura de fus\u00e3o \u00e9 controlada de modo a n\u00e3o exceder 760 \u2103. Quando a temperatura de fus\u00e3o ultrapassa 770 \u2103, a oxida\u00e7\u00e3o da liga de alum\u00ednio se torna grave; a absor\u00e7\u00e3o de hidrog\u00eanio e a inclus\u00e3o de esc\u00f3ria durante o processo de fus\u00e3o aumentam; os gr\u00e3os cristalinos apresentam-se grosseiros durante o processo de fundi\u00e7\u00e3o e solidifica\u00e7\u00e3o; e as propriedades mec\u00e2nicas s\u00e3o reduzidas. Para reduzir a oxida\u00e7\u00e3o da liga de alum\u00ednio no processo de fus\u00e3o, adiciona-se de 0,41 TP3T a 0,51 TP3T do agente de cobertura durante o processo de fus\u00e3o, a fim de proteger a pel\u00edcula de \u00f3xido na superf\u00edcie da liga de alum\u00ednio contra danos. O tipo de agente de cobertura \u00e9 semelhante \u00e0 composi\u00e7\u00e3o qu\u00edmica do agente de limpeza.<\/p>\n<p>A temperatura do processo de fus\u00e3o \u00e9 mantida entre 720 e 760 \u2103. Ap\u00f3s a fus\u00e3o de parte do lingote de alum\u00ednio, s\u00e3o adicionadas mat\u00e9rias-primas com pontos de fus\u00e3o mais elevados, como Si e Ti. O Ti forma n\u00facleos heterog\u00eaneos na liga para refinar a estrutura. Ele \u00e9 injetado no alum\u00ednio fundido para se fundir e 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, para n\u00e3o afetar a difus\u00e3o e a segrega\u00e7\u00e3o. Feche a porta do forno para continuar a fundi\u00e7\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"<p>Aluminum alloys are classified into deformed aluminum alloys and cast aluminum alloys according to their uses. Wrought aluminum alloys include daily-used aluminum alloy doors and&hellip;<\/p>","protected":false},"author":1,"featured_media":5762,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[1676],"class_list":["post-2950","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-cast-aluminum-alloys"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cast Aluminum Alloys,Smelting Process for Aluminum Alloys<\/title>\n<meta name=\"description\" content=\"Cast aluminum alloys mainly including aluminum-silicon alloys, aluminum-copper alloys, and aluminum-magnesium alloys, Aluminum-zinc alloy.\" \/>\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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