fluxos<\/a> s\u00e3o baseados em uma mistura de sais de KCl e NaCl, formando um eut\u00e9tico de baixa temperatura (665 \u00ba\u0421). Outro componente comum do fluxo \u00e9 o fluoreto de s\u00f3dio (NaF), que forma um eut\u00e9tico tern\u00e1rio com KCl e NaCl, com ponto de fus\u00e3o de 607 graus Celsius. O fluxo comum para revestimento cont\u00e9m cerca de 47,5% de NaCl, 47,5% de KCl e 5% de sal de fluoreto. A baixa temperatura de fus\u00e3o \u00e9 importante, pois aumenta a fluidez do fluxo.<\/p>\nFun\u00e7\u00e3o do fluxo de desgaseifica\u00e7\u00e3o do alum\u00ednio<\/h2>\n
Certos compostos se decomp\u00f5em ao emitirem gases, como o cloro ou o di\u00f3xido de carbono. Se esses fluxos penetrarem abaixo da superf\u00edcie da massa fundida, formar\u00e3o bolhas, reduzindo assim o teor de hidrog\u00eanio na massa fundida. O mais conhecido desses compostos \u00e9 o hexacloroetano (C\u2082Cl\u2086), que se divide em compostos gasosos de cloro (Cl\u2082) e AlCl\u2083.<\/p>\n
O sal fluoretado do metal alcalino atua como surfactante, reduzindo a tens\u00e3o superficial entre o fluxo e a superf\u00edcie do metal, bem como entre o fluxo e o \u00f3xido. O sal cloretado apresenta essa caracter\u00edstica em menor grau.<\/p>\n
Os sais de fluoreto de metais alcalinos t\u00eam a capacidade de dissolver \u00f3xidos (embora em uma extens\u00e3o muito pequena), o que os ajuda a penetrar na camada de \u00f3xido presente na esc\u00f3ria e a se depositar na parede do forno. Isso resulta em uma melhor umectabilidade, o que promove a separa\u00e7\u00e3o das inclus\u00f5es de \u00f3xido da massa fundida e do alum\u00ednio met\u00e1lico da esc\u00f3ria.<\/p>\n
Aditivos \u00e0 base de nitrato, como o KNO\u2083, podem provocar a libera\u00e7\u00e3o de calor. Esses fundentes s\u00e3o exot\u00e9rmicos. O oxig\u00eanio liberado pela decomposi\u00e7\u00e3o do nitrato reage com o alum\u00ednio met\u00e1lico, formando Al\u2082O\u2083 e uma grande quantidade de calor. Isso aumenta localmente a taxa de renova\u00e7\u00e3o e promove a separa\u00e7\u00e3o do \u00f3xido met\u00e1lico. No caso do fluxo utilizado para limpar o forno, essa rea\u00e7\u00e3o aumenta a penetra\u00e7\u00e3o do fluxo na parede do forno.<\/p>","protected":false},"excerpt":{"rendered":"
Aluminium Degassing Flux for foundry can remove inclusions or gaseous contaminants in the molten metal with inert or reactive gases. Solid fluxes, such as powders,…<\/p>","protected":false},"author":1,"featured_media":10579,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10578","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n
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