{"id":5463,"date":"2020-10-11T08:05:45","date_gmt":"2020-10-11T08:05:45","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5463"},"modified":"2020-10-11T08:05:45","modified_gmt":"2020-10-11T08:05:45","slug":"insulating-materials","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/insulating-materials\/","title":{"rendered":"Materiais isolantes"},"content":{"rendered":"

Existem muitos tipos de materiais isolantes. De acordo com as diferentes temperaturas de opera\u00e7\u00e3o, eles podem ser divididos em tr\u00eas categorias: materiais isolantes para alta temperatura (acima de 1.200 \u2103), materiais isolantes para temperatura m\u00e9dia (900 a 1.100 \u2103) e materiais isolantes para baixa temperatura (abaixo de 900 \u2103).<\/p>\n

1. Material isolante para altas temperaturas<\/p>\n

Os chamados materiais de isolamento t\u00e9rmico para altas temperaturas referem-se a materiais de isolamento t\u00e9rmico leves materiais refrat\u00e1rios<\/a>, tais como tijolos de argila leves, tijolos leves de alta alumina, tijolos leves de alumina, tijolos leves de s\u00edlica, esferas ocas refrat\u00e1rias de alumina e diversos produtos de fibra refrat\u00e1ria. .<\/p>\n

2. Material isolante para temperaturas m\u00e9dias
\nOs chamados materiais de isolamento para temperaturas m\u00e9dias incluem tijolos isolantes ultraleves de perlita ou part\u00edculas isolantes, tijolos de vidro-\u00e1gua e de pedra, tijolos ultraleves de alta alumina, etc.<\/p>\n

3. Material isolante para baixas temperaturas
\nOs chamados materiais de isolamento para baixas temperaturas incluem tijolos de terra diatom\u00e1cea, amianto, esc\u00f3ria, etc.<\/p>\n

\"Materiais<\/p>\n

No que diz respeito \u00e0 temperatura de uso dos materiais isolantes, \u00e9 preciso observar os seguintes pontos:
\n(1) Com exce\u00e7\u00e3o de v\u00e1rios tijolos refrat\u00e1rios leves que podem ser utilizados como revestimento de fornos sob determinadas condi\u00e7\u00f5es, os demais tijolos isolantes s\u00f3 podem ser assentados sobre a camada externa de tijolos refrat\u00e1rios. Como o tijolo isolante n\u00e3o \u00e9 um material refrat\u00e1rio, ele n\u00e3o resiste aos efeitos f\u00edsicos e qu\u00edmicos em altas temperaturas e n\u00e3o pode exceder a temperatura de uso permitida, a fim de evitar a deteriora\u00e7\u00e3o e a perda do isolamento.
\n(2) A resist\u00eancia \u00e0 compress\u00e3o de v\u00e1rios tijolos isolantes \u00e9 baixa, sendo necess\u00e1rio deixar juntas de dilata\u00e7\u00e3o suficientes durante a alvenaria para evitar a expans\u00e3o e a extrus\u00e3o da alvenaria em altas temperaturas. No projeto, deve-se deixar um espa\u00e7o adequado entre a camada de isolamento e a chapa de a\u00e7o do revestimento do forno, e materiais isolantes em p\u00f3 devem ser preenchidos para permitir a expans\u00e3o do corpo do forno.
\n(3) Os tijolos isolantes n\u00e3o suportam cargas pesadas. Exceto pelo pr\u00f3prio peso, o peso do forno n\u00e3o pode ser suportado pelo tijolo de alta temperatura.
\n(4) O material isolante possui muitos orif\u00edcios, e a porosidade \u00e9 geralmente superior a 70%, o que facilita a absor\u00e7\u00e3o de umidade. Alguns elementos de aquecimento el\u00e9trico no forno el\u00e9trico s\u00e3o fios de molibd\u00eanio, e esses fios s\u00e3o facilmente oxidados pelo vapor de \u00e1gua que se evapora dos materiais do forno em altas temperaturas. \u00c9 claro que o forno de aquecimento pode ser submetido a requisitos rigorosos, mas, mais importante ainda, deve-se utilizar, na medida do poss\u00edvel, materiais secos para o forno de aquecimento.<\/p>","protected":false},"excerpt":{"rendered":"

There are many types of insulating materials. According to the different working temperature, it can be divided into three categories: high temperature (above 1200\u2103) insulation…<\/p>","protected":false},"author":1,"featured_media":5464,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5463","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nInsulating Materials for Metal Casting | Refractory Fiber Cone<\/title>\n<meta name=\"description\" content=\"There are many types of insulating materials. 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