fabricante de unidades de desgaseifica\u00e7\u00e3o<\/a> A Adtech explicou a causa da presen\u00e7a de H na massa fundida de alum\u00ednio.
\nO hidrog\u00eanio pode ser queimado em um forno a g\u00e1s, e o condensado da ferramenta, do fluxo e dos aditivos de liga s\u00e3o introduzidos no alum\u00ednio l\u00edquido.
\nNo entanto, o mais comum \u00e9 que o hidrog\u00eanio seja introduzido no alum\u00ednio fundido por meio da umidade atmosf\u00e9rica. A solubilidade do hidrog\u00eanio aumenta com a umidade relativa da atmosfera.<\/p>\nDevido ao seu baixo peso, o alum\u00ednio \u00e9 um metal e costuma ser utilizado por sua resist\u00eancia relativa.
\nNo entanto, na fundi\u00e7\u00e3o de alum\u00ednio, impurezas chamadas inclus\u00f5es podem criar pontos fracos no produto.
\nExistem muitas raz\u00f5es para essas inclus\u00f5es, mas a presen\u00e7a de hidrog\u00eanio \u00e9 uma das mais comuns.
\nO hidrog\u00eanio \u00e9 sol\u00favel no alum\u00ednio l\u00edquido e consegue passar pelo alum\u00ednio fundido quase como o ar.
\n\u00c0 medida que o metal l\u00edquido esfria e se solidifica, o hidrog\u00eanio flui da \u00e1rea de alta press\u00e3o para a \u00e1rea de baixa press\u00e3o.
\nEle se aglutinar\u00e1 e criar\u00e1 bolhas de ar. Quando o metal se solidificar, as bolhas de ar se tornar\u00e3o inclus\u00f5es e pontos fracos.
\nO processo de desgaseifica\u00e7\u00e3o do alum\u00ednio na fundi\u00e7\u00e3o \u00e9 um processo utilizado para remover o hidrog\u00eanio do alum\u00ednio fundido.<\/p>\n
![\"Processo](\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/10\/Aluminum-Degassing-Process-in-Casting.jpg\")
<\/p>\n
Processo de remo\u00e7\u00e3o
\n\u00c0 medida que cresce a demanda por produtos de alum\u00ednio de alta qualidade, especialmente na ind\u00fastria aeroespacial, tamb\u00e9m aumentou a necessidade de reduzir as inclus\u00f5es nos produtos moldados.
\nUm m\u00e9todo comum para remover o hidrog\u00eanio consiste em injetar nitrog\u00eanio soprado no alum\u00ednio l\u00edquido.
\nO hidrog\u00eanio \u00e9 atra\u00eddo pelas bolhas de nitrog\u00eanio, sendo ent\u00e3o absorvido pelo alum\u00ednio e liberado para a superf\u00edcie.
\nO arg\u00f4nio tamb\u00e9m \u00e9 muito eficaz, mas, devido aos altos custos associados a esse g\u00e1s, o nitrog\u00eanio \u00e9 a op\u00e7\u00e3o preferida.<\/p>\n
Dispositivo rotativo de desgaseifica\u00e7\u00e3o
\nO impulsor rotativo funciona aumentando a \u00e1rea de superf\u00edcie do g\u00e1s inerte introduzido no metal.
\nAs bolhas de nitrog\u00eanio menores produzidas pelo processo do impulsor apresentam uma \u00e1rea superficial total maior e ret\u00eam mais hidrog\u00eanio.
\nA menor perturba\u00e7\u00e3o da superf\u00edcie causada pelas bolhas menores tamb\u00e9m faz com que menos hidrog\u00eanio seja reabsorvido pelo metal a partir da umidade atmosf\u00e9rica.
\nNo processo de desgaseifica\u00e7\u00e3o do alum\u00ednio na fundi\u00e7\u00e3o, os gases inertes ou quimicamente inertes (arg\u00f4nio, nitrog\u00eanio) s\u00e3o removidos por meio do eixo rotativo e do rotor.
\nA energia do eixo girat\u00f3rio resulta na forma\u00e7\u00e3o de um grande n\u00famero de pequenas bolhas, proporcionando assim uma rela\u00e7\u00e3o \u00e1rea superficial\/volume muito elevada.
\nA grande \u00e1rea de superf\u00edcie favorece a difus\u00e3o r\u00e1pida e eficaz do hidrog\u00eanio nas bolhas, equalizando assim a atividade do hidrog\u00eanio nas fases l\u00edquida e gasosa.
\nEm compara\u00e7\u00e3o com a desgaseifica\u00e7\u00e3o por fluxo, o desgaseificador rotativo consegue remover o hidrog\u00eanio de forma mais completa.
\nAl\u00e9m disso, o desgaseificador rotativo n\u00e3o utiliza sais de cloro e fl\u00faor prejudiciais.
\nA m\u00e1quina de desgaseifica\u00e7\u00e3o rotativa tamb\u00e9m pode combinar as fun\u00e7\u00f5es de desgaseifica\u00e7\u00e3o e introdu\u00e7\u00e3o de fluxo.
\nNesse caso, o g\u00e1s inerte atua como transportador do fluxo granular. Esse m\u00e9todo \u00e9 chamado de inje\u00e7\u00e3o de fluxo.<\/p>","protected":false},"excerpt":{"rendered":"
The aluminum degassing process in casting can greatly improve the quality and output of aluminum products, thereby increasing the profitability of aluminum melting and casting…<\/p>","protected":false},"author":1,"featured_media":6021,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[],"class_list":["post-6020","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo"],"yoast_head":"\n
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