{"id":25810,"date":"2023-05-06T06:20:39","date_gmt":"2023-05-06T06:20:39","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=25810"},"modified":"2023-05-06T06:20:39","modified_gmt":"2023-05-06T06:20:39","slug":"refractory-clay","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/refractory-clay\/","title":{"rendered":"argila refrat\u00e1ria"},"content":{"rendered":"

Defini\u00e7\u00e3o de argila refrat\u00e1ria<\/strong><\/p>\n

\u00c9 composta por p\u00f3 refrat\u00e1rio, aglutinante e aditivo. A argamassa refrat\u00e1ria comum, feita de p\u00f3 de cl\u00ednquer refrat\u00e1rio mais uma quantidade adequada de argila pl\u00e1stica como aglutinante e plastificante, apresenta baixa resist\u00eancia \u00e0 temperatura ambiente, mas adquire maior resist\u00eancia quando forma uma liga\u00e7\u00e3o cer\u00e2mica em alta temperatura. A argamassa refrat\u00e1ria de liga\u00e7\u00e3o qu\u00edmica, que utiliza materiais de liga\u00e7\u00e3o hidr\u00e1ulicos, de endurecimento ao ar ou termoendurec\u00edveis como agente de liga\u00e7\u00e3o, produz uma determinada rea\u00e7\u00e3o qu\u00edmica e endurece antes que a temperatura seja inferior \u00e0 necess\u00e1ria para a forma\u00e7\u00e3o da liga\u00e7\u00e3o cer\u00e2mica.
\nO tamanho das part\u00edculas da argamassa refrat\u00e1ria varia de acordo com os requisitos de uso, e seu tamanho m\u00e1ximo de part\u00edcula \u00e9 geralmente inferior a 1 mm; em alguns casos, \u00e9 inferior a 0,5 mm ou ainda mais fino.
\nO material da argamassa refrat\u00e1ria deve ser compat\u00edvel com o dos produtos refrat\u00e1rios para alvenaria. Al\u00e9m de ser utilizada como material de rejunte, a argamassa refrat\u00e1ria tamb\u00e9m pode ser empregada como revestimento protetor para revestimentos internos, por meio de aplica\u00e7\u00e3o com esp\u00e1tula ou pulveriza\u00e7\u00e3o.<\/p>\n

Caracter\u00edsticas e aplica\u00e7\u00e3o da argamassa refrat\u00e1ria:
\n1. Boa plasticidade e facilidade de constru\u00e7\u00e3o;
\n2. Alta resist\u00eancia de ader\u00eancia e forte resist\u00eancia \u00e0 corros\u00e3o;
\n3. Alta refratariedade, at\u00e9 1.650 \u2103 \u00b1 50 \u2103;
\n4. Boa resist\u00eancia \u00e0 invas\u00e3o de esc\u00f3ria;
\n5. Boa esfolia\u00e7\u00e3o t\u00e9rmica. A lama refrat\u00e1ria \u00e9 utilizada principalmente em fornos de coque, fornos de vidro, altos-fornos, fornos de sopro quente e outros fornos industriais. Os setores em que \u00e9 aplicada incluem metalurgia, materiais de constru\u00e7\u00e3o, maquin\u00e1rio, petroqu\u00edmica, vidro, caldeiras, energia el\u00e9trica, siderurgia, cimento, etc.
\nDensidade aparente: 1,8\u20132,2 g\/cm\u00b3.
\nExistem muitos tipos de materiais refrat\u00e1rios, que geralmente s\u00e3o divididos em materiais refrat\u00e1rios comuns (1580-1770 \u00b0C), refrat\u00e1rios avan\u00e7ados (1.770\u20132.000 \u00b0C) e refrat\u00e1rios de grau superior (acima de 2.000 \u00b0C), de acordo com sua refratariedade; quanto \u00e0s propriedades qu\u00edmicas, s\u00e3o classificados em refrat\u00e1rios \u00e1cidos, neutros e b\u00e1sicos. Al\u00e9m disso, existem materiais refrat\u00e1rios para aplica\u00e7\u00f5es especiais.<\/p>\n

A Adtech produz principalmente filtro de espuma cer\u00e2mica<\/a>, unidade de desgaseifica\u00e7\u00e3o<\/a><\/p>\n

A argamassa refrat\u00e1ria pode ser dividida em argamassa refrat\u00e1ria de argila, argamassa refrat\u00e1ria de alta alumina, argamassa refrat\u00e1ria de sil\u00edcio, argamassa refrat\u00e1ria de magn\u00e9sia e assim por diante, de acordo com os diferentes materiais que a comp\u00f5em. De acordo com os diferentes aglutinantes, a argamassa refrat\u00e1ria pode ser dividida nas tr\u00eas categorias a seguir:
\n(1) A argila refrat\u00e1ria com ligante vitrificado \u00e9 uma mistura composta por agregado fino refrat\u00e1rio e ligante vitrificado (argila pl\u00e1stica). \u00c9 fornecida na forma seca e deve ser utilizada ap\u00f3s a adi\u00e7\u00e3o de \u00e1gua. Seu endurecimento ocorre por meio de liga\u00e7\u00e3o cer\u00e2mica em altas temperaturas.
\n(2) Cimento refrat\u00e1rio de ligante hidr\u00e1ulico: trata-se de uma mistura composta por agregado fino refrat\u00e1rio e ligante hidr\u00e1ulico (cimento), que desempenha o papel principal de liga\u00e7\u00e3o. \u00c9 fornecido exclusivamente na forma seca e pode ser utilizado ap\u00f3s a adi\u00e7\u00e3o de \u00e1gua, sem necessidade de aquecimento durante o endurecimento.
\n(3) A argila refrat\u00e1ria com ligante qu\u00edmico \u00e9 uma mistura composta por agregado fino refrat\u00e1rio e ligantes qu\u00edmicos (inorg\u00e2nicos, org\u00e2nico-inorg\u00e2nicos, org\u00e2nicos). O produto \u00e9 fornecido na forma de pasta ou seco, endurecendo abaixo da temperatura de liga\u00e7\u00e3o da cer\u00e2mica. De acordo com a temperatura de endurecimento, essa pasta refrat\u00e1ria pode ser dividida em dois tipos: de endurecimento ao ar e termoendurec\u00edvel. A pasta refrat\u00e1ria de endurecimento ao ar \u00e9 frequentemente preparada com ligantes de endurecimento ao ar, como o vidro sol\u00favel. A argamassa refrat\u00e1ria termoendurec\u00edvel \u00e9 frequentemente formulada com ligantes termoendurec\u00edveis, como \u00e1cido fosf\u00f3rico ou fosfato. Ap\u00f3s o endurecimento, esse tipo de argamassa refrat\u00e1ria termoendurec\u00edvel n\u00e3o s\u00f3 apresenta alta resist\u00eancia em v\u00e1rias temperaturas, mas tamb\u00e9m possui caracter\u00edsticas de baixo encolhimento, juntas herm\u00e9ticas e forte resist\u00eancia \u00e0 corros\u00e3o.
\nExistem dois tipos de argila refrat\u00e1ria: produtos acabados e produtos semiacabados. A chamada argamassa refrat\u00e1ria pronta \u00e9 aquela em que a mat\u00e9ria-prima e o cl\u00ednquer j\u00e1 foram preparados na propor\u00e7\u00e3o correta pelo fabricante, e s\u00f3 precisa ser misturada com \u00e1gua de acordo com a norma quando utilizada no local da obra; a argamassa refrat\u00e1ria semiacabada ou n\u00e3o pronta consiste em mat\u00e9ria-prima e cl\u00ednquer que n\u00e3o foram misturados. Ao utilizar no local, misture completamente de acordo com a composi\u00e7\u00e3o de cada argila, adicione \u00e1gua e mexa uniformemente, conforme as normas.<\/p>","protected":false},"excerpt":{"rendered":"

Definition of refractory clay It is composed of refractory powder, binder, and admixture. Ordinary refractory mud made of refractory clinker powder plus an appropriate amount…<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233,138],"tags":[21],"class_list":["post-25810","post","type-post","status-publish","format-standard","hentry","category-blog","category-seo","tag-ceramic-foam-filter"],"yoast_head":"\nrefractory clay<\/title>\n<meta name=\"description\" content=\"Definition of refractory clay. It is composed of refractory powder, binder, and admixture. 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