{"id":3244,"date":"2020-08-01T07:52:54","date_gmt":"2020-08-01T07:52:54","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3244"},"modified":"2020-08-20T09:55:59","modified_gmt":"2020-08-20T09:55:59","slug":"degassing-in-aluminum-casting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/degassing-in-aluminum-casting\/","title":{"rendered":"Desgaseifica\u00e7\u00e3o na fundi\u00e7\u00e3o de alum\u00ednio"},"content":{"rendered":"

A desgaseifica\u00e7\u00e3o na fundi\u00e7\u00e3o de alum\u00ednio \u00e9 importante devido \u00e0 caracter\u00edstica \u00fanica do hidrog\u00eanio no alum\u00ednio fundido: ele \u00e9 um g\u00e1s com solubilidade evidente. Quando a temperatura do metal fundido cai at\u00e9 a temperatura de solidifica\u00e7\u00e3o, a solubilidade do hidrog\u00eanio diminui significativamente. Ap\u00f3s a conclus\u00e3o da solidifica\u00e7\u00e3o, cerca de 5% do fl\u00faor presente no alum\u00ednio fundido permanece nele. Os outros 95% est\u00e3o concentrados na turbina. Ao atingirem a capacidade de formar bolhas, elas s\u00e3o liberadas no l\u00edquido.<\/p>\n

No entanto, o alum\u00ednio apresenta alta atividade e \u00e9 capaz de reduzir ou decompor facilmente a \u00e1gua com a qual entra em contato.<\/p>\n

Para se obter lingotes de alta qualidade, o p\u00f3 micronizado deve ser removido at\u00e9 um n\u00edvel adequado antes da solidifica\u00e7\u00e3o. A alternativa industrial para remover ou reduzir o teor de carboidratos consiste em fazer passar o g\u00e1s inerte ou semi-inerte diretamente atrav\u00e9s do g\u00e1s inerte, a fim de purificar o alum\u00ednio fundido antes da fundi\u00e7\u00e3o e da solidifica\u00e7\u00e3o.<\/p>\n

Portanto, o ar pode, de prefer\u00eancia, ser purificado com g\u00e1s inerte ou tratado a v\u00e1cuo.<\/p>\n

\"Desgaseifica\u00e7\u00e3o<\/p>\n

Desgaseifica\u00e7\u00e3o na fundi\u00e7\u00e3o de alum\u00ednio<\/h2>\n

A taxa de remo\u00e7\u00e3o, ou seja, o valor residual final do hidrog\u00eanio, depende de v\u00e1rios par\u00e2metros, tais como a temperatura do metal, a solubilidade termodin\u00e2mica, a vaz\u00e3o do g\u00e1s de purifica\u00e7\u00e3o, a vaz\u00e3o do metal em condi\u00e7\u00f5es de desgaseifica\u00e7\u00e3o cont\u00ednua, o tamanho do forno em condi\u00e7\u00f5es de desgaseifica\u00e7\u00e3o est\u00e1tica, bem como a rela\u00e7\u00e3o de remo\u00e7\u00e3o de g\u00e1s e o tamanho das bolhas ou a \u00e1rea de superf\u00edcie. Se a vaz\u00e3o do g\u00e1s de purga for determinada, a taxa de remo\u00e7\u00e3o de hidrog\u00eanio \u00e9 controlada pelo tamanho das bolhas. Quanto menores as bolhas, maior a taxa de difus\u00e3o e, portanto, maior a taxa de remo\u00e7\u00e3o. Uma simples pistola de pulveriza\u00e7\u00e3o ou tubo pode gerar bolhas muito grandes, resultando em uma taxa de remo\u00e7\u00e3o relativamente baixa. A taxa de remo\u00e7\u00e3o pode ser melhorada introduzindo-se o g\u00e1s em pequenas bolhas por meio de um tamp\u00e3o poroso ou de um motor rotativo que cisalha o fluxo de g\u00e1s. Quanto menor a bolha, \u00e0 medida que a taxa de transfer\u00eancia aumenta, maior \u00e9 a \u00e1rea de contato. Quanto menor o di\u00e2metro de Stoke da bolha, mais lenta \u00e9 sua taxa de subida.<\/p>\n

O uso de bolhas inertes para remover o hidrog\u00eanio do alum\u00ednio fundido apresenta algumas limita\u00e7\u00f5es. Para uma remo\u00e7\u00e3o eficaz, s\u00e3o necess\u00e1rias bolhas de ar relativamente pequenas, a fim de maximizar a \u00e1rea de contato. As bolhas menores s\u00e3o geralmente obtidas por meio de um dispositivo de desgaseifica\u00e7\u00e3o com impulsor rotativo. Esse dispositivo \u00e9 capaz de gerar bolhas muito pequenas, que podem permanecer em suspens\u00e3o por um longo per\u00edodo. O dispositivo de desgaseifica\u00e7\u00e3o com impulsor rotativo \u00e9 geralmente instalado mais distante da m\u00e1quina de fundi\u00e7\u00e3o, para que as bolhas tenham tempo suficiente para flutuar e se separar.<\/p>\n

Quando a umidade cont\u00e9m materiais refrat\u00e1rios de contato, essa dist\u00e2ncia tamb\u00e9m permite tempo suficiente para que o hidrog\u00eanio seja reabsorvido pelo alum\u00ednio fundido a partir da umidade circundante. Com base no equil\u00edbrio entre a solubilidade do hidrog\u00eanio e a temperatura, o menor teor de hidrog\u00eanio que pode ser alcan\u00e7ado depende da temperatura. Quanto mais baixa for a temperatura durante o processo de remo\u00e7\u00e3o de hidrog\u00eanio, menor ser\u00e1 o teor final de hidrog\u00eanio ap\u00f3s a solidifica\u00e7\u00e3o. Idealmente, a remo\u00e7\u00e3o de hidrog\u00eanio deveria ocorrer imediatamente antes do in\u00edcio da solidifica\u00e7\u00e3o, mas isso \u00e9 incompat\u00edvel com o processo de purifica\u00e7\u00e3o de g\u00e1s.<\/p>\n

Quando o dispositivo rotativo de desgaseifica\u00e7\u00e3o<\/a> Se n\u00e3o forem produzidas bolhas pequenas suficientes, surgem tamb\u00e9m outros problemas. \u00c9 sabido que, al\u00e9m do tratamento de desgaseifica\u00e7\u00e3o, tamb\u00e9m \u00e9 necess\u00e1rio o tratamento por filtra\u00e7\u00e3o, que utiliza filtros de leito profundo ou filtros de espuma cer\u00e2mica.<\/p>","protected":false},"excerpt":{"rendered":"

Degassing in aluminum casting is important because of the uniqueness of hydrogen in molten aluminum is a gas with obvious solubility. When the temperature of…<\/p>","protected":false},"author":1,"featured_media":3462,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[1765,2036,2004,2003,2005,2032,2035,2034,2033,2007,2028,2016,2017,2031,2041,2015,2008,2018,2030,2009,2010,2006,2002,2038,2029,2020,2014,2040,2019,2012,2011,2042,2044,2043,2045,2047,2046,2013,2039,2037,2022,2023,2027,2024,2025,2026,2021,1766],"class_list":["post-3244","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-degassing-in-aluminum-casting","tag-degassing-in-aluminum-casting-alpha-aluminium-singapore","tag-degassing-in-aluminum-casting-aluminium-empire-myanmar","tag-degassing-in-aluminum-casting-aluminium-factory-in-myanmar","tag-degassing-in-aluminum-casting-aluminium-scrap-myanmar","tag-degassing-in-aluminum-casting-aluminium-singapore","tag-degassing-in-aluminum-casting-aluminium-singapore-buy","tag-degassing-in-aluminum-casting-aluminium-singapore-price","tag-degassing-in-aluminum-casting-aluminium-singapore-supplier","tag-degassing-in-aluminum-casting-aluminium-thailand","tag-degassing-in-aluminum-casting-aluminum-singapore","tag-degassing-in-aluminum-casting-aluminum-thailand","tag-degassing-in-aluminum-casting-alva-aluminum-thailand","tag-degassing-in-aluminum-casting-anodized-aluminum-singapore","tag-degassing-in-aluminum-casting-apex-aluminium-singapore","tag-degassing-in-aluminum-casting-asahi-tec-aluminium-thailand","tag-degassing-in-aluminum-casting-fletcher-aluminium-thailand","tag-degassing-in-aluminum-casting-hal-aluminum-thailand","tag-degassing-in-aluminum-casting-lhl-aluminum-singapore","tag-degassing-in-aluminum-casting-lynn-aluminium-thailand","tag-degassing-in-aluminum-casting-meyer-aluminium-thailand","tag-degassing-in-aluminum-casting-myanmar-aluminium","tag-degassing-in-aluminum-casting-myanmar-aluminium-industry-co-ltd","tag-degassing-in-aluminum-casting-nanshan-aluminium-singapore","tag-degassing-in-aluminum-casting-nanshan-aluminum-singapore","tag-degassing-in-aluminum-casting-nikkei-mc-aluminium","tag-degassing-in-aluminum-casting-nikkei-siam-aluminium-thailand","tag-degassing-in-aluminum-casting-pacific-aluminium-singapore","tag-degassing-in-aluminum-casting-rec-aluminum-thailand","tag-degassing-in-aluminum-casting-reynaers-aluminium-thailand","tag-degassing-in-aluminum-casting-schimmer-aluminium-thailand","tag-degassing-in-aluminum-casting-singapore-aluminium","tag-degassing-in-aluminum-casting-singapore-aluminium-group-pte-ltd","tag-degassing-in-aluminum-casting-singapore-aluminium-suppier","tag-degassing-in-aluminum-casting-singapore-aluminum","tag-degassing-in-aluminum-casting-singapore-aluminum-company","tag-degassing-in-aluminum-casting-singapore-aluminum-supplier","tag-degassing-in-aluminum-casting-sms-aluminium-thailand","tag-degassing-in-aluminum-casting-sunjet-aluminium-singapore","tag-degassing-in-aluminum-casting-tc-aluminium-singapore","tag-degassing-in-aluminum-casting-thailand-aluminum","tag-degassing-in-aluminum-casting-thailand-aluminum-factory","tag-degassing-in-aluminum-casting-thailand-aluminum-foil","tag-degassing-in-aluminum-casting-thailand-aluminum-industry","tag-degassing-in-aluminum-casting-thailand-aluminum-scrap","tag-degassing-in-aluminum-casting-thailand-aluminum-smelter","tag-degassing-in-aluminum-casting-united-aluminum-thailand","tag-rotating-degassing-device"],"yoast_head":"\nDegassing In Aluminum Casting - 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