{"id":2721,"date":"2020-07-10T02:14:59","date_gmt":"2020-07-10T02:14:59","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=2721"},"modified":"2020-10-14T07:39:30","modified_gmt":"2020-10-14T07:39:30","slug":"industrial-ceramic-materials","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/industrial-ceramic-materials\/","title":{"rendered":"Materiais cer\u00e2micos industriais"},"content":{"rendered":"

As cer\u00e2micas de alumina s\u00e3o os materiais cer\u00e2micos industriais avan\u00e7ados mais amplamente utilizados. Devido \u00e0 forte liga\u00e7\u00e3o entre os \u00e1tomos i\u00f4nicos, a alumina oferece bom desempenho em termos de estabilidade qu\u00edmica e t\u00e9rmica, resist\u00eancia relativamente boa e caracter\u00edsticas de isolamento t\u00e9rmico e el\u00e9trico, a um pre\u00e7o razo\u00e1vel. Com diversos graus de pureza e um custo relativamente baixo na produ\u00e7\u00e3o da mat\u00e9ria-prima, a alumina pode ser utilizada em uma ampla gama de aplica\u00e7\u00f5es em diversos setores a um pre\u00e7o razo\u00e1vel.<\/p>\n

Ao contr\u00e1rio das cer\u00e2micas tradicionais \u00e0 base de argila e s\u00edlica, as cer\u00e2micas avan\u00e7adas de alumina (ou cer\u00e2micas modernas, cer\u00e2micas industriais) s\u00e3o utilizadas para diversos fins devido \u00e0s suas excelentes propriedades mec\u00e2nicas, resist\u00eancia \u00e0 corros\u00e3o e \u00e0 oxida\u00e7\u00e3o, ou propriedades el\u00e9tricas, \u00f3pticas e\/ou magn\u00e9ticas, em diversos tipos de aplica\u00e7\u00f5es industriais. Isso se deve \u00e0 sua composi\u00e7\u00e3o qu\u00edmica e microestrutura.<\/p>\n

Os materiais cer\u00e2micos industriais avan\u00e7ados s\u00e3o geralmente compostos por liga\u00e7\u00f5es \u201ch\u00edbridas\u201d \u2014 uma combina\u00e7\u00e3o de liga\u00e7\u00f5es covalentes, i\u00f4nicas e met\u00e1licas \u2014, sendo a maioria deles compostos de metais, metal\u00f3ides e n\u00e3o-metais, como \u00f3xidos, nitretos e carbonetos.<\/p>\n

Quando ingredientes adequados, como \u00f3xido de magn\u00e9sio (MgO), \u00f3xido de \u00edtrio (Y\u2082O\u2083) ou \u00f3xido de c\u00e1lcio (CaO), s\u00e3o adicionados para controlar a transforma\u00e7\u00e3o de fase originalmente destrutiva, a zirc\u00f4nia pode ser um material ideal para alta resist\u00eancia e alta tenacidade. As caracter\u00edsticas da microestrutura de cer\u00e2micas de zirc\u00f4nia<\/a> isso o torna um material de engenharia de escolha para resist\u00eancia ao desgaste, \u00e0 corros\u00e3o, a danos e \u00e0 degrada\u00e7\u00e3o em diversas aplica\u00e7\u00f5es.<\/p>\n

\"Materiais<\/p>\n

O carboneto de sil\u00edcio se destaca por sua dureza, alto ponto de fus\u00e3o e alta condutividade t\u00e9rmica. Ele \u00e9 capaz de manter sua resist\u00eancia a temperaturas de at\u00e9 1.400 \u2103 e oferece excelente resist\u00eancia ao desgaste e ao choque t\u00e9rmico.<\/p>\n

Possui aplica\u00e7\u00f5es industriais bem estabelecidas e amplamente difundidas como suportes de catalisadores e filtros de gases quentes ou de metal fundido, devido ao seu baixo coeficiente de expans\u00e3o t\u00e9rmica e \u00e0 boa resist\u00eancia ao choque t\u00e9rmico, bem como \u00e0 excelente estabilidade mec\u00e2nica e qu\u00edmica em ambientes com temperaturas elevadas.<\/p>\n

A cordierita possui uma resist\u00eancia superior ao choque t\u00e9rmico devido ao seu baixo coeficiente de expans\u00e3o t\u00e9rmica intr\u00ednseco (CET), aliado a uma refratariedade relativamente alta e a uma elevada estabilidade qu\u00edmica. Por isso, \u00e9 frequentemente utilizada em aplica\u00e7\u00f5es industriais de alta temperatura, como trocadores de calor para motores de turbina a g\u00e1s e suportes de catalisadores em forma de favo de mel no sistema de exaust\u00e3o de autom\u00f3veis.<\/p>\n

A mulita ocorre muito raramente na natureza, pois s\u00f3 se forma em condi\u00e7\u00f5es de alta temperatura e baixa press\u00e3o; por isso, como mineral industrial, a mulita precisa ser obtida por meio de alternativas sint\u00e9ticas.<\/p>\n

A mullita \u00e9 um material altamente promissor para cer\u00e2micas avan\u00e7adas em processos industriais, devido \u00e0s suas propriedades t\u00e9rmicas e mec\u00e2nicas favor\u00e1veis: baixa expans\u00e3o t\u00e9rmica, baixa condutividade t\u00e9rmica, excelente resist\u00eancia \u00e0 deforma\u00e7\u00e3o por flu\u00eancia, resist\u00eancia adequada a altas temperaturas e not\u00e1vel estabilidade em ambientes qu\u00edmicos agressivos.<\/p>","protected":false},"excerpt":{"rendered":"

Alumina ceramics are the most widely used advanced industrial ceramic materials. Due to its highly strong bond between ionic atoms, alumina provides good performance in…<\/p>","protected":false},"author":1,"featured_media":5548,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[837,836],"class_list":["post-2721","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-alumina-foam-ceramic","tag-industrial-ceramic-materials"],"yoast_head":"\nIndustrial Ceramic Materials | Alumina Foam Ceramic<\/title>\n<meta name=\"description\" content=\"Alumina ceramics are the most widely used advanced industrial ceramic materials. 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