{"id":2733,"date":"2020-07-11T06:09:51","date_gmt":"2020-07-11T06:09:51","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=2733"},"modified":"2020-10-14T07:12:53","modified_gmt":"2020-10-14T07:12:53","slug":"metal-additives","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/metal-additives\/","title":{"rendered":"Aditivos para metais"},"content":{"rendered":"

Quase 85% do alum\u00ednio total consumido est\u00e1 na forma de ligas de alum\u00ednio. Na fundi\u00e7\u00e3o de ligas de alum\u00ednio, \u00e9 necess\u00e1rio adicionar diversos aditivos met\u00e1licos para produzir ligas com diferentes composi\u00e7\u00f5es e tipos, a fim de atender a diversos requisitos de desempenho. Os elementos comumente utilizados s\u00e3o sil\u00edcio, ferro, cobre, mangan\u00eas, tit\u00e2nio, magn\u00e9sio, cromo, estanho, boro, terras raras, etc. No caso de aditivos de elementos de liga com baixo ponto de fus\u00e3o e alta solubilidade no alum\u00ednio, como magn\u00e9sio e zinco, eles s\u00e3o adicionados principalmente na forma de metal puro. Metais com pontos de fus\u00e3o mais elevados, como sil\u00edcio, ferro e mangan\u00eas, s\u00e3o adicionados na forma de ligas intermedi\u00e1rias. No entanto, o consumo de energia na produ\u00e7\u00e3o de ligas intermedi\u00e1rias \u00e9 muito alto; especialmente no processo de prepara\u00e7\u00e3o das ligas de alum\u00ednio, a perda de elementos de liga \u00e9 maior e o desperd\u00edcio \u00e9 extremamente grande.<\/p>\n

Aditivos para ligas de alum\u00ednio<\/h2>\n

Aditivos para ligas de alum\u00ednio<\/a> pode atingir uma alta taxa de absor\u00e7\u00e3o a uma temperatura relativamente baixa (710-720 \u00b0C), e a taxa de dissolu\u00e7\u00e3o \u00e9 r\u00e1pida. A criolita de pot\u00e1ssio adicionada n\u00e3o s\u00f3 promove a absor\u00e7\u00e3o dos elementos de liga, como tamb\u00e9m contribui para a remo\u00e7\u00e3o da esc\u00f3ria. A adi\u00e7\u00e3o de fluorossilicato de pot\u00e1ssio n\u00e3o s\u00f3 amplia a gama de aditivos, como tamb\u00e9m libera g\u00e1s protetor, o que favorece a desgaseifica\u00e7\u00e3o do alum\u00ednio fundido e melhora ainda mais a pureza do alum\u00ednio fundido. Portanto, o aditivo para liga de alum\u00ednio apresenta alta taxa de absor\u00e7\u00e3o e estabilidade e, ao mesmo tempo, possui a capacidade de purifica\u00e7\u00e3o da massa fundida por meio de desgaseifica\u00e7\u00e3o e forma\u00e7\u00e3o de esc\u00f3ria.<\/p>\n

Os aditivos da liga de alum\u00ednio incluem os seguintes componentes, em porcentagem em peso: p\u00f3 met\u00e1lico 70-90%; criolita de pot\u00e1ssio 5-20%; fluorosilicato de pot\u00e1ssio 0-5%; sal de \u00e1cido graxo de cadeia longa 0-5%, em que a pureza do p\u00f3 met\u00e1lico \u00e9 maior ou igual a 99,5 % e o tamanho das part\u00edculas \u00e9 de 70-120 mesh.<\/p>\n

\"Aditivos<\/p>\n

Aditivos met\u00e1licos para ligas de alum\u00ednio<\/h2>\n

O p\u00f3 met\u00e1lico possui tamanho de part\u00edcula mais fino e maior pureza, podendo reagir com o alum\u00ednio l\u00edquido na termite para promover sua absor\u00e7\u00e3o. A criolita de pot\u00e1ssio possui baixo ponto de fus\u00e3o e pode se tornar l\u00edquida rapidamente na temperatura de adi\u00e7\u00e3o (710-760 \u00b0C), dissolvendo a superf\u00edcie do p\u00f3 met\u00e1lico e a pel\u00edcula de \u00f3xido de alum\u00ednio para promover a absor\u00e7\u00e3o. O fluorossilicato de pot\u00e1ssio, atuando como agente de volume e iniciador, expande-se rapidamente na temperatura de adi\u00e7\u00e3o, o que ajuda o alum\u00ednio l\u00edquido a penetrar no interior do bloco de aditivo. Al\u00e9m disso, promove a rea\u00e7\u00e3o de termite entre o p\u00f3 met\u00e1lico e o alum\u00ednio l\u00edquido e melhora o rendimento efetivo dos elementos de liga. Ao mesmo tempo, o aditivo de liga de alum\u00ednio se decomp\u00f5e, liberando g\u00e1s protetor, o que faz com que o aditivo flutue para cima e para baixo, diminuindo a taxa de sedimenta\u00e7\u00e3o, e a taxa de dissolu\u00e7\u00e3o do elemento de liga \u00e9 aumentada em mais de 1 vez. O sal de \u00e1cido graxo superior \u00e9 usado principalmente para coes\u00e3o, o que \u00e9 conveniente para a briquetagem.<\/p>\n

Caracter\u00edsticas dos aditivos para metais<\/h2>\n

1. A taxa de absor\u00e7\u00e3o \u00e9 est\u00e1vel e elevada.
\n2. A criolita de pot\u00e1ssio presente nos aditivos tem a capacidade de remover esc\u00f3rias. O fluorossilicato de pot\u00e1ssio se decomp\u00f5e para liberar um g\u00e1s protetor com capacidade de desgaseifica\u00e7\u00e3o; portanto, esse aditivo tamb\u00e9m contribui para a purifica\u00e7\u00e3o da massa fundida.<\/p>","protected":false},"excerpt":{"rendered":"

Nearly 85% of the total aluminum consumed is in the form of aluminum alloys. When smelting aluminum alloy, various metal additives need to be added…<\/p>","protected":false},"author":1,"featured_media":5539,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[829,828],"class_list":["post-2733","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-aluminum-alloy-additives","tag-metal-additives-for-aluminum-alloy"],"yoast_head":"\nMetal Additives for Aluminum Alloy,Aluminum Alloy Additives<\/title>\n<meta name=\"description\" content=\"When smelting aluminum alloy, various metal additives need to be added to make the aluminum alloy meet the performance requirements.\" \/>\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\/metal-additives\/\" \/>\n<meta property=\"og:locale\" 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