{"id":7064,"date":"2020-12-17T08:17:21","date_gmt":"2020-12-17T08:17:21","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7064"},"modified":"2020-12-17T08:17:21","modified_gmt":"2020-12-17T08:17:21","slug":"molten-aluminium-degassing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/molten-aluminium-degassing\/","title":{"rendered":"Desgaseifica\u00e7\u00e3o do alum\u00ednio fundido"},"content":{"rendered":"<p>O metal fundido cont\u00e9m um alto teor de res\u00edduos de \u00f3xido e\/ou nitreto, o que tem um efeito negativo na solidifica\u00e7\u00e3o de certas ligas. A forma fundida ou liquefeita do alum\u00ednio tamb\u00e9m favorece a forma\u00e7\u00e3o e a absor\u00e7\u00e3o de hidrog\u00eanio no alum\u00ednio fundido. O hidrog\u00eanio se precipita na forma de poros durante a solidifica\u00e7\u00e3o da liga de alum\u00ednio, o que n\u00e3o \u00e9 favor\u00e1vel \u00e0s propriedades mec\u00e2nicas da liga s\u00f3lida. A desgaseifica\u00e7\u00e3o do alum\u00ednio fundido \u00e9 um m\u00e9todo eficaz para reduzir a porosidade causada pelo hidrog\u00eanio.<\/p>\n<p>Um dos processos de desgaseifica\u00e7\u00e3o do alum\u00ednio fundido consiste na introdu\u00e7\u00e3o de uma mistura de um g\u00e1s inerte (como arg\u00f4nio ou nitrog\u00eanio) e um g\u00e1s reativo (como cloro) no alum\u00ednio fundido, a fim de capturar o hidrog\u00eanio e as impurezas s\u00f3lidas hidratadas. A mistura de gases sobe borbulhando at\u00e9 a superf\u00edcie, juntamente com o hidrog\u00eanio e as impurezas de \u00f3xido.<\/p>\n<p>O alum\u00ednio fundido tamb\u00e9m pode exigir desgaseifica\u00e7\u00e3o com fluxo. <a href=\"http:\/\/www.alalloycasting.com\/pt\/flux-degassing\/\">Desgaseamento por fluxo<\/a> \u00e9 um processo de introdu\u00e7\u00e3o de misturas de sais em p\u00f3 ou granuladas, como cloreto e\/ou fluoreto, no alum\u00ednio fundido por meio de um g\u00e1s transportador, como nitrog\u00eanio ou arg\u00f4nio. O fluxo de sal pode ser introduzido por meio de equipamento de desgaseifica\u00e7\u00e3o rotativo. Um exemplo de dispositivo rotativo inclui um eixo oco central acoplado a um rotor que \u00e9 inserido na banha de alum\u00ednio fundido e girado de modo que o fluxo de sal percorra o eixo oco e seja disperso no alum\u00ednio fundido por meio de orif\u00edcios no rotor.<\/p>\n<p>Ainda h\u00e1 a necessidade de fornecer um aparelho e um m\u00e9todo para realizar, de forma eficaz e segura, a inje\u00e7\u00e3o de uma quantidade predeterminada de fluxo de desgaseifica\u00e7\u00e3o no metal fundido.<\/p>\n<p>O dispositivo injetor de fluxo inclui um tanque pressurizado adaptado para armazenar e fornecer fluxo sob press\u00e3o. Um mecanismo de alimenta\u00e7\u00e3o para descarregar uma quantidade predeterminada de fluxo na sa\u00edda do tanque pressurizado e um controlador para monitorar e operar o equipamento. O mecanismo de alimenta\u00e7\u00e3o inclui um inv\u00f3lucro com uma parede interna que define uma cavidade com uma entrada e uma sa\u00edda. A roda de alimenta\u00e7\u00e3o est\u00e1 posicionada na cavidade e \u00e9 capaz de receber uma quantidade predeterminada de fluxo pela entrada, deslocar o fluxo dentro da cavidade e descarregar a quantidade predeterminada de fluxo pela sa\u00edda do tanque pressurizado.<\/p>","protected":false},"excerpt":{"rendered":"<p>Molten metal includes a high content of oxide and\/or nitride debris, which has a negative effect on the solidification of certain alloys. The molten or&hellip;<\/p>","protected":false},"author":1,"featured_media":7065,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-7064","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Molten Aluminium Degassing Flux -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Molten aluminium degassing is an effective method to reduce the porosity caused by hydrogen. 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