{"id":2243,"date":"2020-06-11T09:08:36","date_gmt":"2020-06-11T09:08:36","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=2243"},"modified":"2020-09-04T08:41:58","modified_gmt":"2020-09-04T08:41:58","slug":"influence-of-impurity-elements","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/influence-of-impurity-elements\/","title":{"rendered":"Influ\u00eancia dos elementos de impureza"},"content":{"rendered":"

A pioneira na tecnologia de purifica\u00e7\u00e3o por fus\u00e3o \u00e9 tamb\u00e9m a fornecedora do seu sistema de filtragem de metais. A influ\u00eancia dos elementos impuros \u00e9 significativa para a pureza do metal. Para obter a melhor pureza do metal, a AdTech pode fornecer sistemas, aditivos para ligas de alum\u00ednio<\/a>, m\u00e9todos operacionais, servi\u00e7os metal\u00fargicos e suporte. A capacidade da Sistema de filtragem CFF<\/a> A captura dessas inclus\u00f5es \u00e9 essencial para manter o lingote limpo durante a solidifica\u00e7\u00e3o do metal. Dessa forma, a qualidade e a produtividade das opera\u00e7\u00f5es subsequentes (como forjamento, extrus\u00e3o e lamina\u00e7\u00e3o) ficam garantidas.<\/p>\n

Influ\u00eancia dos elementos de impureza<\/h2>\n

O van\u00e1dio forma compostos refrat\u00e1rios do tipo VAl11 nas ligas de alum\u00ednio, que contribuem para o refinamento dos gr\u00e3os durante o processo de fundi\u00e7\u00e3o, mas seu efeito \u00e9 menor do que o do tit\u00e2nio e do zirc\u00f4nio. O van\u00e1dio tamb\u00e9m tem o efeito de refinar a estrutura de recristaliza\u00e7\u00e3o e aumentar a temperatura de recristaliza\u00e7\u00e3o.<\/p>\n

O c\u00e1lcio apresenta solubilidade s\u00f3lida muito baixa em ligas de alum\u00ednio e forma compostos de CaAl\u2084 com o alum\u00ednio. O c\u00e1lcio tamb\u00e9m \u00e9 um elemento superpl\u00e1stico das ligas de alum\u00ednio. As ligas com cerca de 5% de c\u00e1lcio e 5% de mangan\u00eas apresentam superplasticidade. O c\u00e1lcio e o sil\u00edcio formam CaSi e s\u00e3o insol\u00faveis no alum\u00ednio. Devido \u00e0 redu\u00e7\u00e3o da solu\u00e7\u00e3o s\u00f3lida de sil\u00edcio, a condutividade do alum\u00ednio puro industrial pode ser ligeiramente melhorada. O c\u00e1lcio pode melhorar o desempenho de corte das ligas de alum\u00ednio. O CaSi\u2082 n\u00e3o \u00e9 capaz de refor\u00e7ar a liga de alum\u00ednio por meio de tratamento t\u00e9rmico. Tra\u00e7os de c\u00e1lcio s\u00e3o ben\u00e9ficos para a remo\u00e7\u00e3o de hidrog\u00eanio do alum\u00ednio l\u00edquido.<\/p>\n

Os elementos chumbo, estanho e bismuto s\u00e3o metais de baixo ponto de fus\u00e3o. Sua solubilidade s\u00f3lida no alum\u00ednio n\u00e3o \u00e9 elevada, o que reduz ligeiramente a resist\u00eancia da liga, mas pode melhorar o desempenho de corte. O bismuto se expande durante o processo de solidifica\u00e7\u00e3o, o que \u00e9 ben\u00e9fico para a retra\u00e7\u00e3o. A adi\u00e7\u00e3o de bismuto \u00e0 liga com alto teor de magn\u00e9sio evita a fragiliza\u00e7\u00e3o por s\u00f3dio.
\nO antim\u00f4nio \u00e9 utilizado principalmente como modificador em ligas de alum\u00ednio fundidas, sendo que as ligas de alum\u00ednio deformadas raramente s\u00e3o utilizadas. Apenas na liga de alum\u00ednio deformada Al-Mg ele substitui o bismuto para evitar a fragiliza\u00e7\u00e3o por s\u00f3dio. O antim\u00f4nio \u00e9 adicionado a algumas ligas da s\u00e9rie Al-Zn-Mg-Cu para melhorar o desempenho na prensagem a quente e a frio.<\/p>\n

\"Influ\u00eancia<\/p>\n

O ber\u00edlio pode melhorar a estrutura da pel\u00edcula de \u00f3xido na liga de alum\u00ednio deformada e reduzir a perda por queima e as inclus\u00f5es durante a fundi\u00e7\u00e3o. O ber\u00edlio \u00e9 um elemento t\u00f3xico que pode causar intoxica\u00e7\u00e3o al\u00e9rgica. Portanto, as ligas de alum\u00ednio que entram em contato com alimentos e bebidas n\u00e3o devem conter ber\u00edlio. O teor de ber\u00edlio em materiais de soldagem \u00e9 normalmente mantido abaixo de 8 \u03bcg\/ml. A liga de alum\u00ednio utilizada como base de soldagem tamb\u00e9m deve ter seu teor de ber\u00edlio controlado.<\/p>\n

O s\u00f3dio \u00e9 praticamente insol\u00favel no alum\u00ednio; a solubilidade m\u00e1xima no estado s\u00f3lido \u00e9 inferior a 0,0025%, e o ponto de fus\u00e3o do s\u00f3dio \u00e9 baixo (97,8 \u2103). Quando o s\u00f3dio est\u00e1 presente na liga, ele \u00e9 adsorvido na superf\u00edcie das dendritas ou nos limites dos gr\u00e3os durante a solidifica\u00e7\u00e3o. Durante o trabalho a quente, o s\u00f3dio nos limites dos gr\u00e3os forma uma camada de adsor\u00e7\u00e3o l\u00edquida. Quando ocorre fissura\u00e7\u00e3o fr\u00e1gil, formam-se compostos de NaAlSi sem s\u00f3dio livre, e a \u201cfragilidade do s\u00f3dio\u201d n\u00e3o \u00e9 gerada. Quando o teor de magn\u00e9sio excede 2%, o magn\u00e9sio captura o sil\u00edcio e precipita o s\u00f3dio livre, resultando na \u201cfragilidade por s\u00f3dio\u201d. Portanto, n\u00e3o \u00e9 permitido o uso de fundente \u00e0 base de sal de s\u00f3dio em ligas de alum\u00ednio com alto teor de magn\u00e9sio. O m\u00e9todo para prevenir a \u201cfragiliza\u00e7\u00e3o por s\u00f3dio\u201d \u00e9 o m\u00e9todo de clora\u00e7\u00e3o, de modo que o s\u00f3dio forme NaCl e seja descarregado na esc\u00f3ria, e o bismuto seja adicionado para gerar Na\u2082Bi na matriz met\u00e1lica. A adi\u00e7\u00e3o de antim\u00f4nio para produzir Na\u2083Sb ou a adi\u00e7\u00e3o de terras raras tamb\u00e9m podem desempenhar a mesma fun\u00e7\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"

The pioneer of melt purification technology is also the source of your metal filtration system. The influence of impurity elements is great for metal cleanliness.…<\/p>","protected":false},"author":1,"featured_media":4508,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[387,386],"class_list":["post-2243","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-alloys-purification-technology","tag-influence-of-impurity-elements"],"yoast_head":"\nInfluence of Impurity Elements, Aluminum Alloys Purification Technology<\/title>\n<meta name=\"description\" content=\"In order to reduce the influence of impurity elements in aluminum alloys, AdTech can provide filtering systems, operating methods.\" \/>\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\/influence-of-impurity-elements\/\" \/>\n<meta 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