agente desgaseificador<\/a> se decomp\u00f5em facilmente em altas temperaturas, e o g\u00e1s gerado reage facilmente com o hidrog\u00eanio, al\u00e9m de apresentar forte for\u00e7a de adsor\u00e7\u00e3o \u00e0 esc\u00f3ria, escapando rapidamente da massa fundida. Os demais componentes t\u00eam um efeito de remo\u00e7\u00e3o da esc\u00f3ria.<\/p>\nOs fluxos de desgaseifica\u00e7\u00e3o de alum\u00ednio s\u00e3o aplic\u00e1veis \u00e0s ligas de alum\u00ednio comumente utilizadas (ligas com alto teor de magn\u00e9sio e ligas de alum\u00ednio-magn\u00e9sio), bem como \u00e0 fundi\u00e7\u00e3o de alum\u00ednio puro, ao refinamento por desgaseifica\u00e7\u00e3o e \u00e0 remo\u00e7\u00e3o de esc\u00f3ria.<\/p>\n
O agente de refino \u00e9 espalhado sobre a superf\u00edcie do l\u00edquido e \u00e9 rapidamente incorporado ao alum\u00ednio fundido. Ap\u00f3s ser completamente misturado, \u00e9 deixado em repouso para a forma\u00e7\u00e3o de esc\u00f3ria; se for pulverizado, o agente de refino \u00e9 pulverizado no alum\u00ednio fundido com um g\u00e1s inerte.<\/p>\n
Fun\u00e7\u00e3o do fluxo na fus\u00e3o do alum\u00ednio<\/strong><\/p>\n1. Alterar a molhabilidade do alum\u00ednio fundido em rela\u00e7\u00e3o ao \u00f3xido (al\u00famina), de modo que o alum\u00ednio fundido seja facilmente separado do \u00f3xido (al\u00famina), fazendo com que a maior parte do \u00f3xido (al\u00famina) penetre no fluxo e reduza o teor de \u00f3xidos na pe\u00e7a.<\/p>\n
2. O fluxo pode alterar o estado da camada de \u00f3xido na superf\u00edcie do material fundido. Isso ocorre porque ele \u00e9 capaz de fragmentar a camada de \u00f3xido s\u00f3lida e densa na superf\u00edcie do material fundido em part\u00edculas finas, facilitando assim que o hidrog\u00eanio presente no material fundido escape do espa\u00e7o entre as part\u00edculas da camada de \u00f3xido e entre na atmosfera.<\/p>\n
3. A presen\u00e7a da camada de fluxo pode isolar o contato entre o vapor de \u00e1gua e o alum\u00ednio fundido na atmosfera, o que dificulta a entrada de hidrog\u00eanio no alum\u00ednio fundido e, ao mesmo tempo, evita a perda oxidativa do ferro fundido.<\/p>\n
4. O fluxo adsorve os \u00f3xidos durante a fundi\u00e7\u00e3o do alum\u00ednio para purificar o metal fundido. Em resumo, o efeito do refinamento em corrente para remover inclus\u00f5es \u00e9 obtido principalmente por meio da adsor\u00e7\u00e3o, dissolu\u00e7\u00e3o e rea\u00e7\u00f5es qu\u00edmicas com as camadas de \u00f3xido e as inclus\u00f5es n\u00e3o met\u00e1licas presentes no metal fundido.<\/p>","protected":false},"excerpt":{"rendered":"
Aluminium degassing agent is a white powder or granular stream, which is prepared by drying a plurality of inorganic salts and mixing them in a…<\/p>","protected":false},"author":1,"featured_media":11448,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-11447","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n
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