{"id":10539,"date":"2021-10-12T08:13:40","date_gmt":"2021-10-12T08:13:40","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10539"},"modified":"2021-10-12T08:13:40","modified_gmt":"2021-10-12T08:13:40","slug":"wall-cleaning-fluxes","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/wall-cleaning-fluxes\/","title":{"rendered":"Fluxos para limpeza de paredes"},"content":{"rendered":"

Os fluxos de limpeza de paredes ajudam a manter as paredes do cadinho e do forno, tanto acima quanto abaixo da linha de fus\u00e3o, livres de ac\u00famulo de \u00f3xido. Isso reduz tanto o desperd\u00edcio de liga quanto outra fonte de inclus\u00f5es indesejadas.<\/p>\n

Os fluxos de limpeza de paredes amolecem os \u00f3xidos acumulados nas paredes do forno. Esses fluxos cont\u00eam fluoretos duplos (Na\u2082SiF\u2086, Na\u2082AlF\u2086) e um agente oxidante. O agente oxidante reage com o alum\u00ednio, gerando calor, o que promove a penetra\u00e7\u00e3o dos fluoretos nos \u00f3xidos acumulados, amolecendo-os. Os \u00f3xidos amolecidos s\u00e3o facilmente removidos da parede pelo operador do forno.<\/p>\n

Os fluxos de limpeza removem os \u00f3xidos suspensos no alum\u00ednio fundido. Da mesma forma que o Fluxos de esc\u00f3ria<\/a>, o fluxo de limpeza \u00e9 composto por uma mistura de cloretos, fluoretos e um agente oxidante. Os fluxos de limpeza geram menos calor; portanto, seu efeito de separa\u00e7\u00e3o do alum\u00ednio \u00e9 menor. No entanto, eles possuem maior capacidade de absorver inclus\u00f5es de \u00f3xidos da massa fundida.<\/p>\n

A pr\u00e1tica comum para a introdu\u00e7\u00e3o de fundente \u00e9 a aplica\u00e7\u00e3o manual. A maioria dos fundentes \u00e9 aplicada na superf\u00edcie da massa fundida e incorporada \u00e0 mesma por meio de agita\u00e7\u00e3o. Alguns fundentes (para desgaseifica\u00e7\u00e3o e refinamento de gr\u00e3os) s\u00e3o introduzidos no fundo da massa fundida por meio de uma camp\u00e2nula perfurada, limpa e pr\u00e9-aquecida.<\/p>\n

\"\"<\/p>\n

Os fundentes tamb\u00e9m podem ser introduzidos na massa fundida por inje\u00e7\u00e3o, na forma de p\u00f3, em uma corrente de g\u00e1s inerte (arg\u00f4nio ou nitrog\u00eanio). A t\u00e9cnica mais simples de inje\u00e7\u00e3o de fundente consiste no uso de uma lan\u00e7a imersa na massa fundida. O m\u00e9todo mais eficaz de introdu\u00e7\u00e3o de fundente \u00e9 a inje\u00e7\u00e3o por meio de um desgaseificador rotativo.<\/p>\n

Injete nitrog\u00eanio (press\u00e3o de 1,2 a 1,8 kg\/cm\u00b2) e, em seguida, acione a v\u00e1lvula localizada sob o tanque de refino. O g\u00e1s utilizado \u00e9 nitrog\u00eanio de alta pureza 99,991 TP3T. \u00c9 recomend\u00e1vel que a press\u00e3o do nitrog\u00eanio durante o refinamento seja suficiente para expelir o p\u00f3. A quantidade de agente de refinamento \u00e9 de aproximadamente 0,15 a 0,201 TP3T.<\/p>\n

A temperatura de refino \u00e9 mantida em cerca de 730 a 750 graus Celsius, e a esc\u00f3ria pode ser removida ap\u00f3s um repouso de 20 minutos ap\u00f3s o refino. Procure evitar agitar o alum\u00ednio l\u00edquido ao remover a esc\u00f3ria, para n\u00e3o fazer com que ela fique presa no alum\u00ednio l\u00edquido; em seguida, use o agente de cobertura para derreter a superf\u00edcie e impedir que o corpo se reoxide e absorva.<\/p>","protected":false},"excerpt":{"rendered":"

Wall cleaning fluxes help keep crucible and furnace walls above and below the melt line free of oxide build-up. This reduces both alloy wastage and…<\/p>","protected":false},"author":1,"featured_media":10540,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-10539","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fluxes"],"yoast_head":"\nWall Cleaning Fluxes for Aluminum Melting -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Wall cleaning fluxes help keep crucible and furnace walls free of oxide build-up. 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