filtro de espuma cer\u00e2mica<\/a> placa, e pode ser colocada em produ\u00e7\u00e3o sem testar o efeito do alum\u00ednio l\u00edquido.<\/p>\nA qualidade do alum\u00ednio l\u00edquido produzido por esse m\u00e9todo \u00e9 baixa, o n\u00edvel de produ\u00e7\u00e3o \u00e9 reduzido e o custo \u00e9 elevado.<\/p>\n
Algumas empresas de grande e m\u00e9dio porte especializadas em fundi\u00e7\u00e3o sob press\u00e3o de ligas de alum\u00ednio adotam, em sua maioria, m\u00e9todos que incluem a fundi\u00e7\u00e3o centralizada, a remo\u00e7\u00e3o de esc\u00f3ria no forno, a subcontrata\u00e7\u00e3o dos processos de desgaseifica\u00e7\u00e3o e tratamento de esc\u00f3ria e, em seguida, a transfer\u00eancia para o forno para organizar a produ\u00e7\u00e3o.<\/p>\n
Para algumas pe\u00e7as fundidas com requisitos elevados, essas empresas costumam utilizar fornos de fus\u00e3o cont\u00ednua como fornos auxiliares \u00e0s m\u00e1quinas.<\/p>\n
O alum\u00ednio fundido passa por um processo de desarejamento em linha com g\u00e1s inerte e \u00e9 filtrado com espuma cer\u00e2mica para a produ\u00e7\u00e3o de pe\u00e7as fundidas.<\/p>\n
O equipamento de desgaseifica\u00e7\u00e3o gira um injetor imerso na massa fundida, de modo que o g\u00e1s de purga (geralmente um g\u00e1s inerte) seja distribu\u00eddo na massa fundida na forma de pequenas bolhas, a fim de purificar a massa fundida de alum\u00ednio e remover o hidrog\u00eanio.<\/p>\n
Quanto menos e com maior frequ\u00eancia as bolhas forem removidas, melhor ser\u00e1 a desgaseifica\u00e7\u00e3o da massa fundida e n\u00e3o haver\u00e1 impurezas de \u00f3xido.<\/p>\n
O equipamento de desgaseifica\u00e7\u00e3o n\u00e3o s\u00f3 pode ser utilizado para purificar o alum\u00ednio fundido no processo de desgaseifica\u00e7\u00e3o, como tamb\u00e9m \u00e9 capaz de remover o \u00f3xido residual da superf\u00edcie por meio de um defletor (l\u00e2mina) quando operado corretamente.<\/p>\n
A desgaseifica\u00e7\u00e3o rotativa \u00e9 geralmente utilizada em combina\u00e7\u00e3o com um g\u00e1s inerte, como o nitrog\u00eanio, adequado para a massa fundida em quest\u00e3o.<\/p>\n
Em alguns casos, os gases inertes de purga tamb\u00e9m ser\u00e3o misturados com baixas concentra\u00e7\u00f5es (< 2,5%) de hexafluoreto de enxofre ou cloro.<\/p>\n
No alum\u00ednio fundido, o teor de hidrog\u00eanio \u00e9 consideravelmente reduzido em compara\u00e7\u00e3o com outros m\u00e9todos de purga a g\u00e1s, devido \u00e0 distribui\u00e7\u00e3o uniforme do g\u00e1s de purga do rotor.<\/p>\n
Com esse princ\u00edpio, \u00e9 poss\u00edvel limpar praticamente qualquer superf\u00edcie do banho, obt\u00e9m-se uma distribui\u00e7\u00e3o muito ampla das bolhas em todo o recipiente de tratamento e o tempo de tratamento pode ser reduzido por meio de uma desgaseifica\u00e7\u00e3o e purifica\u00e7\u00e3o da massa fundida eficazes.<\/p>","protected":false},"excerpt":{"rendered":"
In aerospace industry, the requirements of casting aluminum alloy castings are very high. Most companies still use inert gas rotary degassing and slag removal operations…<\/p>","protected":false},"author":1,"featured_media":5677,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5676","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n
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