{"id":10164,"date":"2021-09-02T02:05:33","date_gmt":"2021-09-02T02:05:33","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10164"},"modified":"2021-09-02T02:05:33","modified_gmt":"2021-09-02T02:05:33","slug":"master-alloys","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/master-alloys\/","title":{"rendered":"Ligas-m\u00e3e"},"content":{"rendered":"

Atualmente, diversas ligas-m\u00e3e s\u00e3o geralmente utilizadas para substituir os aditivos, pois apresentam baixo ponto de fus\u00e3o e s\u00e3o mais f\u00e1ceis de derreter de forma r\u00e1pida e uniforme na massa fundida de alum\u00ednio. No entanto, muitos fabricantes utilizam sucata de alum\u00ednio ou lingotes de alum\u00ednio de baixa qualidade na produ\u00e7\u00e3o de ligas-m\u00e3e, que cont\u00eam mais impurezas. Ao utilizar ligas-m\u00e3e, essas impurezas s\u00e3o introduzidas na massa fundida e causam contamina\u00e7\u00e3o.<\/p>\n

Na fundi\u00e7\u00e3o de ligas, geralmente h\u00e1 tr\u00eas maneiras de adicionar elementos de liga: uma delas \u00e9 adicionar metais puros diretamente ao alum\u00ednio fundido, como cobre, magn\u00e9sio, zinco, sil\u00edcio e outros metais. A outra \u00e9 transformar os elementos de liga em uma liga-m\u00e3e com anteced\u00eancia. Em seguida, ela \u00e9 adicionada ao alum\u00ednio fundido na forma dessa liga-m\u00e3e. Atualmente, \u00e9 mais comum adicionar diversos aditivos met\u00e1licos ao alum\u00ednio fundido. Al\u00e9m disso, existe um m\u00e9todo que consiste em adicionar sais ou compostos contendo elementos de liga, reduzindo esses elementos por meio de uma rea\u00e7\u00e3o de substitui\u00e7\u00e3o com o metal-base e incorporando-os ao material fundido.<\/p>\n

O objetivo do uso de aditivos para ligas de alum\u00ednio<\/a> \u00e9 facilitar a adi\u00e7\u00e3o de alguns elementos de liga que possuem um ponto de fus\u00e3o mais elevado e n\u00e3o s\u00e3o facilmente fundidos, nem se oxidam ou volatilizam com facilidade, de modo a controlar com maior precis\u00e3o a composi\u00e7\u00e3o da liga de alum\u00ednio. Al\u00e9m disso, o uso de uma liga-m\u00e3e como carga pode evitar o superaquecimento da massa fundida, reduzir o tempo de fundi\u00e7\u00e3o e diminuir a perda de metal.<\/p>\n

\"\"<\/p>\n

Os aditivos para ligas de alum\u00ednio utilizados devem atender, na medida do poss\u00edvel, aos seguintes requisitos b\u00e1sicos:<\/strong><\/p>\n

(1) O ponto de fus\u00e3o deve ser inferior ou pr\u00f3ximo \u00e0 temperatura de fus\u00e3o da liga de alum\u00ednio;
\n(2) O teor dos elementos de liga \u00e9 o mais alto poss\u00edvel, e a composi\u00e7\u00e3o \u00e9 uniforme;
\n(3) Baixo teor de impurezas, gases e inclus\u00f5es n\u00e3o met\u00e1licas:
\n(4) Possui fragilidade suficiente, \u00e9 f\u00e1cil de quebrar e \u00e9 pr\u00e1tico para os ingredientes;
\n(5) N\u00e3o \u00e9 suscet\u00edvel \u00e0 corros\u00e3o e n\u00e3o deve se desintegrar em p\u00f3 quando armazenado \u00e0 temperatura e press\u00e3o atmosf\u00e9ricas.<\/p>","protected":false},"excerpt":{"rendered":"

At present, various master alloys are generally used to replace additives, because master alloys have a low melting point and are easier to quickly and…<\/p>","protected":false},"author":1,"featured_media":10165,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6144],"tags":[12517,12516],"class_list":["post-10164","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-metal-additive","tag-aluminum-alloy-additive","tag-master-alloys-for-aluminum-melt"],"yoast_head":"\nMaster Alloys for Aluminum Melt, Aluminum Alloy Additive<\/title>\n<meta name=\"description\" content=\"At present, various master alloys are generally used to replace additives, because master alloys have a low melting point.\" \/>\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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