{"id":9847,"date":"2021-08-10T09:45:14","date_gmt":"2021-08-10T09:45:14","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=9847"},"modified":"2021-08-10T09:45:14","modified_gmt":"2021-08-10T09:45:14","slug":"gas-and-inclusions-in-molten-aluminum","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/gas-and-inclusions-in-molten-aluminum\/","title":{"rendered":"G\u00e1s e inclus\u00f5es no alum\u00ednio fundido"},"content":{"rendered":"<p>A purifica\u00e7\u00e3o do alum\u00ednio fundido \u00e9 uma das medidas para garantir produtos de liga de alum\u00ednio de alta qualidade e tamb\u00e9m o principal meio de melhorar a qualidade geral das ligas de alum\u00ednio. O efeito do refinamento do alum\u00ednio fundido exerce influ\u00eancia importante na forma\u00e7\u00e3o de poros, cavidades de retra\u00e7\u00e3o e inclus\u00f5es, al\u00e9m de afetar diretamente as propriedades f\u00edsicas e mec\u00e2nicas das pe\u00e7as fundidas de liga de alum\u00ednio. Sem alum\u00ednio fundido de alta qualidade, mesmo que o processamento subsequente seja avan\u00e7ado, os defeitos sempre existir\u00e3o no produto uma vez que ocorram, e pe\u00e7as fundidas de alta qualidade s\u00e3o dif\u00edceis de obter. Portanto, devemos prestar aten\u00e7\u00e3o aos gases e \u00e0s inclus\u00f5es no alum\u00ednio fundido e tomar medidas para remov\u00ea-los.<\/p>\n<p><strong>G\u00e1s e inclus\u00f5es no alum\u00ednio fundido<\/strong><\/p>\n<p>O g\u00e1s presente no alum\u00ednio fundido \u00e9 composto principalmente por hidrog\u00eanio (aproximadamente 80% a 90%), seguido por nitrog\u00eanio, oxig\u00eanio e mon\u00f3xido de carbono. O hidrog\u00eanio \u00e9 praticamente insol\u00favel no alum\u00ednio s\u00f3lido, mas apresenta grande solubilidade na fase l\u00edquida. A solubilidade do hidrog\u00eanio na fase s\u00f3lida \u00e9 de 0,65 mL e de 0,034 mL por 100 g de alum\u00ednio fundido; ou seja, a diferen\u00e7a entre a solubilidade do hidrog\u00eanio nas fases s\u00f3lida e l\u00edquida \u00e9 de 19,1 vezes, e o teor normal de hidrog\u00eanio por 100 g de alum\u00ednio fundido \u00e9 de 0,1 a 0,4 mL. Devido \u00e0 diferen\u00e7a de solubilidade, o hidrog\u00eanio tende a escapar da massa fundida. Quando a press\u00e3o do hidrog\u00eanio \u00e9 maior do que a tens\u00e3o superficial e a press\u00e3o hidrost\u00e1tica, formam-se bolhas, o que, por sua vez, cria poros min\u00fasculos na pe\u00e7a fundida. Portanto, na purifica\u00e7\u00e3o da liga de alum\u00ednio fundida, o principal problema \u00e9 que o teor de hidrog\u00eanio da liga de alum\u00ednio \u00e9 relativamente alto. Normalmente, quando o teor de hidrog\u00eanio por 100 g de alum\u00ednio \u00e9 de 0,1 a 0,2 mL, os requisitos de produ\u00e7\u00e3o s\u00e3o atendidos. Para pe\u00e7as fundidas com requisitos especiais, o teor de hidrog\u00eanio por 100 g de alum\u00ednio deve ser inferior a 0,06 mL.<\/p>\n<p>Inclus\u00f5es s\u00e3o quaisquer s\u00f3lidos e subst\u00e2ncias que n\u00e3o sejam l\u00edquidos acima da linha de liquidus. As impurezas n\u00e3o met\u00e1licas comuns no alum\u00ednio fundido incluem \u00f3xidos, nitretos, carbonetos, boretos, etc., a maioria dos quais existe na forma granular, e o tamanho t\u00edpico das part\u00edculas est\u00e1 na faixa de 1 a 30 m. Exceto no caso da carga, se for o produto de uma rea\u00e7\u00e3o qu\u00edmica no processo de fus\u00e3o. A espessura da pel\u00edcula de \u00f3xido na superf\u00edcie do alum\u00ednio \u00e9 de 2 a 10 m, e aumenta para 200 m quando se aproxima do ponto de fus\u00e3o. A pel\u00edcula de \u00f3xido na superf\u00edcie do l\u00edquido n\u00e3o s\u00f3 \u00e9 mais espessa, como tamb\u00e9m sua estrutura se alterou. O lado voltado para o alum\u00ednio fundido \u00e9 denso e exerce um efeito protetor sobre o alum\u00ednio fundido, enquanto a parte externa da pel\u00edcula \u00e9 porosa, apresentando pequenos orif\u00edcios com di\u00e2metro de 5 a 10 m em seu interior, preenchidos com hidrog\u00eanio, ar e vapor de \u00e1gua. Se a pel\u00edcula l\u00edquida for agitada no alum\u00ednio fundido, isso aumentar\u00e1 as impurezas e a presen\u00e7a de g\u00e1s.<\/p>\n<p>Al\u00e9m disso, alguns compostos intermet\u00e1licos prim\u00e1rios indesej\u00e1veis, como o alum\u00ednio-zirc\u00f4nio, o alum\u00ednio-tit\u00e2nio etc., surgir\u00e3o em fus\u00f5es de ligas de alta composi\u00e7\u00e3o. A liga de alum\u00ednio contendo ferro tamb\u00e9m forma uma fase Al-Fe rica em ferro, que \u00e9 equivalente \u00e0 Al-Si-Fe. A fase Al-Si-Fe \u00e9 um composto em forma de agulha que danifica gravemente a matriz de alum\u00ednio e afeta suas propriedades mec\u00e2nicas.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-9836\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2021\/08\/Aluminum-Casting-Flux-Purification.jpg\" alt=\"Purifica\u00e7\u00e3o do fluxo na fundi\u00e7\u00e3o de alum\u00ednio\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/08\/Aluminum-Casting-Flux-Purification.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/08\/Aluminum-Casting-Flux-Purification-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Existe uma forte intera\u00e7\u00e3o entre as inclus\u00f5es na liga de alum\u00ednio e o g\u00e1s, e o teor de hidrog\u00eanio no alum\u00ednio fundido \u00e9 fortemente afetado pelas inclus\u00f5es. Quando o teor de inclus\u00f5es \u00e9 de 0,002% e 0,02%, o teor de hidrog\u00eanio correspondente \u00e9 de 0,2 mL\/100 gAl e 0,35 mL\/100 gAl.<\/p>\n<p>No caso de um mesmo teor de hidrog\u00eanio, quanto maior o teor de inclus\u00f5es, maior ser\u00e1 a taxa de poros min\u00fasculos. Por outro lado, quando o teor de impurezas no alum\u00ednio fundido \u00e9 muito baixo, o teor de hidrog\u00eanio tamb\u00e9m \u00e9 muito baixo. Mesmo que o hidrog\u00eanio seja introduzido artificialmente, ele se precipitar\u00e1 automaticamente e retornar\u00e1 rapidamente ao seu teor original. Mesmo que exista uma pequena quantidade de inclus\u00f5es, isso pode reduzir significativamente a concentra\u00e7\u00e3o cr\u00edtica de poros.<\/p>\n<p>Por outro lado, na aus\u00eancia de inclus\u00f5es, a concentra\u00e7\u00e3o cr\u00edtica de hidrog\u00eanio necess\u00e1ria para a forma\u00e7\u00e3o de poros pode chegar a 0,3 mL\/100 g de Al. Portanto, a remo\u00e7\u00e3o de impurezas e de g\u00e1s deve ser realizada simultaneamente, o que \u00e9 igualmente importante.<\/p>\n<p>Situa\u00e7\u00e3o atual de <a href=\"http:\/\/www.alalloycasting.com\/pt\/aluminum-alloy-melt-purification\/\">purifica\u00e7\u00e3o da liga de alum\u00ednio fundida<\/a> Do ponto de vista tecnol\u00f3gico, o tratamento abrangente de purifica\u00e7\u00e3o e refinamento de gr\u00e3os do alum\u00ednio l\u00edquido constitui o problema fundamental para se obter alum\u00ednio de alta qualidade a partir da purifica\u00e7\u00e3o de ligas de alum\u00ednio fundidas. De acordo com as diferentes etapas da produ\u00e7\u00e3o, o tratamento de purifica\u00e7\u00e3o do alum\u00ednio fundido pode ser dividido em tratamento no forno e tratamento fora do forno. O tratamento em forno de ligas de alum\u00ednio pode ser dividido em tecnologia de purifica\u00e7\u00e3o por adsor\u00e7\u00e3o e tecnologia de purifica\u00e7\u00e3o sem adsor\u00e7\u00e3o, de acordo com o mecanismo de purifica\u00e7\u00e3o. A purifica\u00e7\u00e3o pelo m\u00e9todo de adsor\u00e7\u00e3o baseia-se principalmente no efeito de adsor\u00e7\u00e3o das inclus\u00f5es oxidadas produzidas pelo <a href=\"http:\/\/www.alalloycasting.com\/pt\/refining-agents\/\">agente refinador<\/a>, e, ao mesmo tempo, remove as inclus\u00f5es oxidadas e o hidrog\u00eanio ligado \u00e0 superf\u00edcie, a fim de purificar o alum\u00ednio fundido. A purifica\u00e7\u00e3o sem adsor\u00e7\u00e3o baseia-se em outros efeitos f\u00edsicos e qu\u00edmicos para alcan\u00e7ar o objetivo de purificar o alum\u00ednio fundido. O efeito de purifica\u00e7\u00e3o do m\u00e9todo de adsor\u00e7\u00e3o ocorre apenas na interface de adsor\u00e7\u00e3o, enquanto o efeito de purifica\u00e7\u00e3o do m\u00e9todo sem adsor\u00e7\u00e3o atua sobre todo o alum\u00ednio fundido ao mesmo tempo.<\/p>","protected":false},"excerpt":{"rendered":"<p>The purification of molten aluminum is one of the measures to ensure high-quality aluminum alloy products, and it is also the main means to improve&hellip;<\/p>","protected":false},"author":1,"featured_media":9848,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[12343,7574,833],"class_list":["post-9847","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-gas-and-inclusions-in-molten-aluminum","tag-purification-of-molten-aluminum","tag-refining-agent"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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