{"id":5346,"date":"2020-09-30T07:42:02","date_gmt":"2020-09-30T07:42:02","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5346"},"modified":"2020-09-30T07:42:02","modified_gmt":"2020-09-30T07:42:02","slug":"aluminium-degassing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminium-degassing\/","title":{"rendered":"Desgaseifica\u00e7\u00e3o do alum\u00ednio"},"content":{"rendered":"

A desgaseifica\u00e7\u00e3o da liga de alum\u00ednio fundida por inje\u00e7\u00e3o \u00e9 muito importante para as propriedades mec\u00e2nicas da pe\u00e7a fundida. A absor\u00e7\u00e3o de hidrog\u00eanio \u00e9 a principal causa da forma\u00e7\u00e3o de poros min\u00fasculos nas pe\u00e7as fundidas de liga de alum\u00ednio e da redu\u00e7\u00e3o da estanqueidade ao ar e das propriedades mec\u00e2nicas. Portanto, \u00e9 necess\u00e1rio adotar diversas medidas para controlar rigorosamente o teor de hidrog\u00eanio e de outros gases.<\/p>\n

Medidas para controlar o teor de hidrog\u00eanio<\/strong><\/p>\n

    \n
  1. Antes de introduzir a carga no forno, \u00e9 necess\u00e1rio remover completamente a ferrugem e as manchas de \u00f3leo da carga e pr\u00e9-aquec\u00ea-la at\u00e9 a temperatura especificada.<\/li>\n
  2. O forno deve ser pr\u00e9-aquecido antes da adi\u00e7\u00e3o da carga, a fim de remover a umidade presente no forno e evitar que a umidade e os hidrocarbonetos entrem em contato com a carga.<\/li>\n
  3. Antes do contato com a liga de alum\u00ednio fundida, ela deve ser totalmente pr\u00e9-aquecida para remover a umidade, e a superf\u00edcie das ferramentas de ferro deve ser revestida com um agente de revestimento.<\/li>\n
  4. Controle a temperatura e o tempo de fus\u00e3o, evite o superaquecimento da liga de alum\u00ednio fundida e a forma\u00e7\u00e3o de g\u00e1s, e utilize o agente refinador<\/a> para o refinamento da liga de alum\u00ednio fundida. O agente de refinamento deve estar totalmente seco antes do uso.<\/li>\n
  5. O hidrog\u00eanio contido no alum\u00ednio fundido \u00e9 precipitado por meio da inje\u00e7\u00e3o de um g\u00e1s inerte no alum\u00ednio fundido contido no recipiente de transfer\u00eancia, a fim de reduzir o teor de hidrog\u00eanio na liga de alum\u00ednio fundida.<\/li>\n<\/ol>\n

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

    O processo a g\u00e1s refere-se ao transporte do alum\u00ednio fundido no recipiente de transfer\u00eancia at\u00e9 o unidade de desgaseifica\u00e7\u00e3o de alum\u00ednio<\/a>, e preenchendo o alum\u00ednio fundido com g\u00e1s inerte atrav\u00e9s dos orif\u00edcios de ventila\u00e7\u00e3o no rotor de grafite para precipitar o hidrog\u00eanio, reduzindo assim o teor de hidrog\u00eanio no l\u00edquido fundido. Na opera\u00e7\u00e3o normal de fundi\u00e7\u00e3o, o processo de desgaseifica\u00e7\u00e3o por transfer\u00eancia \u00e9 otimizado e aprimorado, e diferentes tipos de gases inertes s\u00e3o utilizados para preencher a liga de alum\u00ednio fundida em transfer\u00eancia, de modo que o hidrog\u00eanio contido na liga de alum\u00ednio fundida possa ser efetivamente precipitado, reduzindo assim o valor da densidade da liga de alum\u00ednio fundida.<\/p>\n

    Escolhemos dois tipos diferentes de gases inertes: nitrog\u00eanio e arg\u00f4nio, misturados em diferentes propor\u00e7\u00f5es, e depois desgaseificados durante o transporte. A partir dos dados experimentais, verifica-se que, se for utilizada uma propor\u00e7\u00e3o maior de arg\u00f4nio para a desgaseifica\u00e7\u00e3o durante o transporte, seu valor de densidade ser\u00e1 significativamente reduzido, mas o custo de produ\u00e7\u00e3o relacionado ao uso da desgaseifica\u00e7\u00e3o aumentar\u00e1 em mais de 25%. Ap\u00f3s uma discuss\u00e3o abrangente e a considera\u00e7\u00e3o de fatores como o controle dos custos de produ\u00e7\u00e3o, a pesquisa decidiu, por fim, utilizar nitrog\u00eanio.<\/p>","protected":false},"excerpt":{"rendered":"

    The aluminium degassing of die-casting aluminum alloy is very important to the mechanical properties of the casting. The hydrogen absorption is the main reason for…<\/p>","protected":false},"author":1,"featured_media":5347,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5346","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nAluminium Degassing with Nitrogen | Degassing Unit<\/title>\n<meta name=\"description\" content=\"The aluminium degassing with nitrogen of die-casting aluminum alloy is very important to the mechanical properties of the casting.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/pt\/aluminium-degassing\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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