{"id":10604,"date":"2021-10-14T07:44:46","date_gmt":"2021-10-14T07:44:46","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10604"},"modified":"2021-10-14T07:44:46","modified_gmt":"2021-10-14T07:44:46","slug":"degassing-with-flux","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/degassing-with-flux\/","title":{"rendered":"Desgaseifica\u00e7\u00e3o com fluxo"},"content":{"rendered":"

Para o alum\u00ednio e as ligas de alum\u00ednio, a desgaseifica\u00e7\u00e3o e a forma\u00e7\u00e3o de esc\u00f3ria com fundente constituem um m\u00e9todo importante. Ao se utilizar o refinamento com fundente, forma-se um grande n\u00famero de got\u00edculas finas e dispersas de fundente na massa fundida. De acordo com a lei do equil\u00edbrio de dissolu\u00e7\u00e3o, o hidrog\u00eanio at\u00f4mico presente no banho fundido \u00e9 levado \u00e0 superf\u00edcie do l\u00edquido devido \u00e0 difus\u00e3o das got\u00edculas de fluxo, reduzindo assim o teor de hidrog\u00eanio no banho fundido.<\/p>\n

Durante a fundi\u00e7\u00e3o, o metal fundido cont\u00e9m uma grande quantidade de g\u00e1s e se solidifica, formando um orif\u00edcio redondo com superf\u00edcie interna lisa no lingote. As principais causas da forma\u00e7\u00e3o de poros s\u00e3o: as mat\u00e9rias-primas utilizadas est\u00e3o \u00famidas, e o forno e as ferramentas n\u00e3o est\u00e3o completamente secos. A temperatura de fus\u00e3o \u00e9 alta, a cobertura \u00e9 insuficiente, o tempo de perman\u00eancia em alta temperatura \u00e9 longo e a massa fundida absorve uma grande quantidade de g\u00e1s. Se o refinamento por desgaseifica\u00e7\u00e3o n\u00e3o for completo, durante o processo de cristaliza\u00e7\u00e3o, o g\u00e1s n\u00e3o consegue escapar da massa fundida e forma poros. Ap\u00f3s o processamento sob press\u00e3o, os poros podem ser comprimidos, mas n\u00e3o \u00e9 f\u00e1cil pression\u00e1-los, e \u00e9 f\u00e1cil causar defeitos como forma\u00e7\u00e3o de crosta e bolhas nos produtos processados e tratados termicamente, al\u00e9m de as diversas propriedades do metal serem drasticamente reduzidas.<\/p>\n

O fluxo utilizado para a purifica\u00e7\u00e3o \u00e9 um sal com baixo ponto de fus\u00e3o, baixa densidade, baixa tens\u00e3o superficial, alta atividade e forte capacidade de adsor\u00e7\u00e3o de \u00f3xidos. Ao utiliz\u00e1-lo, coloque um pequeno peda\u00e7o de fluxo na gaiola de ferro e, em seguida, insira-a no fundo do forno de mistura e agite-a para frente e para tr\u00e1s. Ap\u00f3s o t\u00e9rmino do fluxo, retire a gaiola de ferro e deixe repousar por 5 a 10 minutos. Remova a esc\u00f3ria da superf\u00edcie e, em seguida, fa\u00e7a a fundi\u00e7\u00e3o.<\/p>\n

\"Fluxo<\/p>\n

Se necess\u00e1rio, o fluxo de cobertura<\/a> tamb\u00e9m pode ser espalhado sobre a superf\u00edcie para cobri-la. Embora o fluxo possa dissolver hidrog\u00eanio e gerar g\u00e1s vol\u00e1til em contato com o alum\u00ednio, ele possui um efeito de desgaseifica\u00e7\u00e3o. No entanto, a pr\u00e1tica comprovou que o efeito de desgaseifica\u00e7\u00e3o \u00e9 inferior ao da refina\u00e7\u00e3o a g\u00e1s e da desgaseifica\u00e7\u00e3o, e que o efeito de remo\u00e7\u00e3o de esc\u00f3ria na massa fundida \u00e9 muito superior ao da refina\u00e7\u00e3o a g\u00e1s. O efeito de remo\u00e7\u00e3o de esc\u00f3ria do fluxo \u00e9 obtido principalmente por meio da adsor\u00e7\u00e3o, dissolu\u00e7\u00e3o e rea\u00e7\u00e3o qu\u00edmica do fluxo com a esc\u00f3ria de alumina na massa fundida.<\/p>","protected":false},"excerpt":{"rendered":"

For aluminum and aluminum alloys, degassing and slagging with flux is an important method. When using flux refining, a large number of dispersed and fine…<\/p>","protected":false},"author":1,"featured_media":10605,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10604","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nDegassing with Flux, Aluminum Dgeassing Refining<\/title>\n<meta name=\"description\" content=\"For aluminum and aluminum alloys, degassing and slagging with flux is an important method. 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