unidade de desgaseifica\u00e7\u00e3o<\/a> para o alum\u00ednio fundido \u00e9 colocado entre o forno de reten\u00e7\u00e3o e a m\u00e1quina de fundi\u00e7\u00e3o. O nitrog\u00eanio \u00e9 injetado na liga de alum\u00ednio fundida e, em seguida, fragmentado por meio de um rotor girat\u00f3rio de grafite no tanque de desgaseifica\u00e7\u00e3o. Assim, forma-se um grande n\u00famero de bolhas dispersas, o que faz com que a liga de alum\u00ednio l\u00edquida entre em contato total com o nitrog\u00eanio no tanque de tratamento. De acordo com o princ\u00edpio da diferen\u00e7a de press\u00e3o e da adsor\u00e7\u00e3o superficial, as bolhas absorvem hidrog\u00eanio e esc\u00f3ria de \u00f3xido. Em seguida, as bolhas sobem \u00e0 superf\u00edcie do material fundido, formando uma esc\u00f3ria. Por fim, a liga de alum\u00ednio fundida flui da sa\u00edda da unidade de desgaseifica\u00e7\u00e3o para a m\u00e1quina de fundi\u00e7\u00e3o, a fim de purificar a liga de alum\u00ednio.<\/p>\nO processo de remo\u00e7\u00e3o do hidrog\u00eanio \u00e9 chamado de desgaseifica\u00e7\u00e3o. Um dos m\u00e9todos mais eficazes de desgaseifica\u00e7\u00e3o do alum\u00ednio \u00e9 o uso de g\u00e1s inerte seco \u2014 o nitrog\u00eanio \u2014 para a desgaseifica\u00e7\u00e3o rotativa com g\u00e1s inerte. O segredo da desgaseifica\u00e7\u00e3o rotativa \u00e9 que o rotor consegue quebrar as grandes bolhas de g\u00e1s inerte em bolhas muito pequenas, fazendo com que elas se difundam por todo o metal fundido. Ao reduzir o di\u00e2metro das bolhas, a \u00e1rea de superf\u00edcie do g\u00e1s inerte aumenta drasticamente, de modo que mais superf\u00edcies do g\u00e1s inerte entram em contato com o hidrog\u00eanio e as impurezas no metal fundido, e o hidrog\u00eanio ou as impurezas s\u00e3o removidos do alum\u00ednio fundido \u00e0 medida que as bolhas sobem.<\/p>\n
![\"M\u00e9todo](\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/10\/Degassing-Method-of-Aluminum-2.jpg\")
<\/p>\n
Princ\u00edpio da desgaseifica\u00e7\u00e3o<\/strong><\/p>\nO hidrog\u00eanio dissolvido se deslocar\u00e1 da regi\u00e3o de alta concentra\u00e7\u00e3o (no metal fundido) para a regi\u00e3o de baixa concentra\u00e7\u00e3o (no g\u00e1s inerte). O hidrog\u00eanio se dispersar\u00e1 no metal fundido \u00e0 medida que for liberado em qualquer espa\u00e7o confinado. Ele manter\u00e1 uma concentra\u00e7\u00e3o constante em toda a massa fundida. A taxa de migra\u00e7\u00e3o do hidrog\u00eanio no alum\u00ednio fundido \u00e9 quase t\u00e3o r\u00e1pida quanto a do ar. Portanto, n\u00e3o \u00e9 necess\u00e1rio expor cada on\u00e7a de metal a gases inertes.<\/p>\n
A efici\u00eancia da desgaseifica\u00e7\u00e3o do alum\u00ednio depende de dois fatores: a taxa de transporte na interface metal\/g\u00e1s e a \u00e1rea superficial total que pode ser transportada.<\/p>","protected":false},"excerpt":{"rendered":"
The degassing method of aluminum is to reduce the hydrogen (gas content) in aluminum melt before casting, which is one of the most important parts…<\/p>","protected":false},"author":1,"featured_media":5712,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5679","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n
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