{"id":2040,"date":"2020-05-26T06:52:54","date_gmt":"2020-05-26T06:52:54","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=2040"},"modified":"2020-09-03T04:02:00","modified_gmt":"2020-09-03T04:02:00","slug":"aluminium-alloy-refining-process","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminium-alloy-refining-process\/","title":{"rendered":"Processo de refino de ligas de alum\u00ednio"},"content":{"rendered":"

O processo de refino de ligas de alum\u00ednio por meio do sistema de desgaseifica\u00e7\u00e3o rotativo permite remover o hidrog\u00eanio e a esc\u00f3ria, purificar o alum\u00ednio e eliminar os poros min\u00fasculos. Com o r\u00e1pido desenvolvimento da ind\u00fastria automotiva, a produ\u00e7\u00e3o de pe\u00e7as fundidas de liga de alum\u00ednio est\u00e1 crescendo rapidamente. A grande quantidade de res\u00edduos de fundi\u00e7\u00e3o causada pelo tratamento inadequado das ligas de alum\u00ednio fundidas \u00e9 um problema que os fabricantes de pe\u00e7as fundidas de liga de alum\u00ednio precisam resolver com urg\u00eancia. Nos \u00faltimos anos, as pesquisas sobre o processo de refino de ligas de alum\u00ednio t\u00eam atra\u00eddo a aten\u00e7\u00e3o dos profissionais da \u00e1rea de fundi\u00e7\u00e3o. Existem muitos fatores que afetam a qualidade dos fundidos de liga de alum\u00ednio, incluindo a composi\u00e7\u00e3o qu\u00edmica da liga, o estado de fus\u00e3o, o refinamento da liga e sua modifica\u00e7\u00e3o.<\/p>\n

O defeito de poros min\u00fasculos em pe\u00e7as fundidas de liga de alum\u00ednio \u00e9 a principal causa de rejei\u00e7\u00e3o na fundi\u00e7\u00e3o. A presen\u00e7a de poros min\u00fasculos n\u00e3o apenas reduz a \u00e1rea \u00fatil efetiva da pe\u00e7a fundida, mas tamb\u00e9m constitui uma fonte de trincas e acelera o processo de propaga\u00e7\u00e3o das trincas. Isso acaba levando a uma diminui\u00e7\u00e3o das propriedades mec\u00e2nicas do material. A forma\u00e7\u00e3o de poros min\u00fasculos decorre principalmente do teor de inclus\u00f5es de esc\u00f3ria e do teor de hidrog\u00eanio na massa fundida. O hidrog\u00eanio representa cerca de 85% do g\u00e1s total na massa fundida de alum\u00ednio. Isso ocorre porque a solubilidade do hidrog\u00eanio no alum\u00ednio s\u00f3lido \u00e9 cerca de 1\/20 da solubilidade no estado l\u00edquido. Quando o alum\u00ednio se solidifica, o hidrog\u00eanio dissolvido nele se precipita, formando poros min\u00fasculos. O processo de refino da liga de alum\u00ednio por rota\u00e7\u00e3o sistema de desgaseifica\u00e7\u00e3o<\/a>\u00a0pode remover o hidrog\u00eanio e as esc\u00f3rias, purificar o alum\u00ednio l\u00edquido e eliminar os poros das pe\u00e7as fundidas.<\/p>\n

Processo de refino de ligas de alum\u00ednio<\/h2>\n

O princ\u00edpio de funcionamento \u00e9 o seguinte: quando o motor faz o rotor girar, o g\u00e1s arg\u00f4nio \u00e9 fragmentado em pequenas bolhas. A presen\u00e7a dessas pequenas bolhas reduz a concentra\u00e7\u00e3o de hidrog\u00eanio no alum\u00ednio l\u00edquido e a press\u00e3o parcial em sua superf\u00edcie, reduzindo assim a concentra\u00e7\u00e3o de hidrog\u00eanio no alum\u00ednio l\u00edquido. O hidrog\u00eanio \u00e9 retirado da superf\u00edcie do alum\u00ednio l\u00edquido pelo g\u00e1s arg\u00f4nio e queimado e consumido na superf\u00edcie do l\u00edquido.<\/p>\n

Quando pequenas bolhas de g\u00e1s arg\u00f4nio se deslocam em dire\u00e7\u00e3o \u00e0 superf\u00edcie do l\u00edquido, na parte inferior do alum\u00ednio fundido, o hidrog\u00eanio dissolvido no alum\u00ednio fundido atinge a interface entre o arg\u00f4nio e o alum\u00ednio fundido, passando do estado dissolvido para o estado adsorvido. Os \u00e1tomos de g\u00e1s na camada de adsor\u00e7\u00e3o reagem, gerando mol\u00e9culas de hidrog\u00eanio. \u00c0 medida que as bolhas crescem, elas sobem at\u00e9 a superf\u00edcie do alum\u00ednio fundido e se queimam.<\/p>\n

\"Processo<\/h2>\n

Quando pequenas bolhas de g\u00e1s arg\u00f4nio se deslocam do fundo do alum\u00ednio l\u00edquido at\u00e9 a superf\u00edcie do l\u00edquido, as part\u00edculas de inclus\u00e3o suspensas no alum\u00ednio l\u00edquido s\u00e3o agitadas, e as inclus\u00f5es colidem entre si, agrupam-se e crescem. Quando a inclus\u00e3o atinge um determinado tamanho, ela pode colidir com as bolhas flutuantes e ser capturada. Em seguida, \u00e9 levada at\u00e9 a superf\u00edcie do l\u00edquido, obtendo-se assim o efeito de remo\u00e7\u00e3o da esc\u00f3ria.<\/p>\n

Existem dois modelos de inclus\u00f5es que ficam presas em bolhas, os quais resultam na captura por colis\u00e3o inercial no caso de inclus\u00f5es maiores. Para inclus\u00f5es menores, \u00e9 dif\u00edcil que haja colis\u00e3o com as bolhas, mas pode ocorrer um aprisionamento tangencial ao redor delas.<\/p>\n

Como o arg\u00f4nio \u00e9 um g\u00e1s inerte, o alum\u00ednio l\u00edquido n\u00e3o reage. Ele pode substituir o hidrog\u00eanio na massa fundida de alum\u00ednio, o que reduz significativamente o teor de hidrog\u00eanio nessa massa e melhora as propriedades mec\u00e2nicas da liga de alum\u00ednio.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminium alloy refining process by rotating degassing system can remove hydrogen and slag, purify the aluminum, and eliminate the pinholes. With the rapid development of…<\/p>","protected":false},"author":1,"featured_media":4287,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[234,1734,4499,231,1762,1756,1765,116,1777,106,1466,4640,324,4369,4347,1707,835,1767,4367,4513,4641,1771,117,31,4301,92,4371,642,1467,834,1980,1769,1706,4370,1773,1772,235],"class_list":["post-2040","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminium-alloy-refining-process","tag-aluminum-melt-degassing-and-refining","tag-aluminum-refining-degassing","tag-define-degassing","tag-degassing-aluminum-casting","tag-degassing-and-refining","tag-degassing-in-aluminum-casting","tag-degassing-in-casting","tag-degassing-molten-aluminium","tag-degassing-process","tag-degassing-process-in-aluminum-casting","tag-degassing-refining","tag-degassing-system","tag-degassing-unit-for-sale","tag-degassing-with-nitrogen","tag-dual-rotor-online-degassing-unit","tag-flux-degassing","tag-hydrogen-degassing","tag-main-components-of-degassing-device","tag-melting-degassing","tag-metal-degassing-system","tag-methods-of-degassing-in-foundry","tag-molten-aluminum-degasser","tag-molten-aluminum-refining-degassing","tag-nitrogen-degassing-aluminum","tag-online-degassing-device","tag-online-degassing-of-aluminum","tag-online-degassing-system","tag-refining-and-degassing-in-aluminum-alloy","tag-rotary-degasser","tag-rotary-degassing-aluminum","tag-rotary-degassing-equipment","tag-rotary-degassing-machine","tag-rotary-degassing-machine-manufacturer","tag-rotary-degassing-method","tag-rotary-degassing-unit","tag-rotating-degassing-system"],"yoast_head":"\nAluminium 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