{"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\/fr\/insulating-materials\/","title":{"rendered":"Mat\u00e9riaux isolants"},"content":{"rendered":"

Il existe de nombreux types de mat\u00e9riaux isolants. En fonction de la temp\u00e9rature de fonctionnement, on peut les classer en trois cat\u00e9gories : les mat\u00e9riaux isolants pour hautes temp\u00e9ratures (sup\u00e9rieures \u00e0 1 200 \u00b0C), les mat\u00e9riaux isolants pour temp\u00e9ratures moyennes (900 \u00e0 1 100 \u00b0C) et les mat\u00e9riaux isolants pour basses temp\u00e9ratures (inf\u00e9rieures \u00e0 900 \u00b0C).<\/p>\n

1. Mat\u00e9riau isolant r\u00e9sistant aux hautes temp\u00e9ratures<\/p>\n

Les mat\u00e9riaux dits \u00ab d'isolation thermique \u00e0 haute temp\u00e9rature \u00bb d\u00e9signent des isolants thermiques l\u00e9gers mat\u00e9riaux r\u00e9fractaires<\/a>, tels que les briques d'argile l\u00e9g\u00e8res, les briques l\u00e9g\u00e8res \u00e0 haute teneur en alumine, les briques l\u00e9g\u00e8res en alumine, les briques l\u00e9g\u00e8res en silice, les billes creuses r\u00e9fractaires en alumine et divers produits en fibres r\u00e9fractaires. .<\/p>\n

2. Mat\u00e9riau isolant pour temp\u00e9ratures moyennes
\nLes mat\u00e9riaux isolants dits \u00ab \u00e0 temp\u00e9rature moyenne \u00bb d\u00e9signent notamment les briques isolantes ultra-l\u00e9g\u00e8res en perlite ou les particules isolantes, les briques en verre soluble, les briques ultra-l\u00e9g\u00e8res \u00e0 haute teneur en alumine, etc.<\/p>\n

3. Mat\u00e9riau isolant pour basses temp\u00e9ratures
\nLes mat\u00e9riaux dits \u00ab d'isolation \u00e0 basse temp\u00e9rature \u00bb d\u00e9signent notamment les briques de terre de diatom\u00e9es, l'amiante, les scories, etc.<\/p>\n

\"Mat\u00e9riaux<\/p>\n

En ce qui concerne la temp\u00e9rature d'utilisation des mat\u00e9riaux isolants, il convient de tenir compte des points suivants :
\n(1) \u00c0 l'exception de certaines briques r\u00e9fractaires l\u00e9g\u00e8res pouvant servir de rev\u00eatement de four dans certaines conditions, les autres briques isolantes ne peuvent \u00eatre pos\u00e9es que sur la couche ext\u00e9rieure de briques r\u00e9fractaires. La brique isolante n'\u00e9tant pas un mat\u00e9riau r\u00e9fractaire, elle ne peut pas r\u00e9sister aux effets physiques et chimiques li\u00e9s aux hautes temp\u00e9ratures et ne doit pas d\u00e9passer la temp\u00e9rature d'utilisation admissible afin d'\u00e9viter toute d\u00e9t\u00e9rioration et perte d'isolation.
\n(2) La r\u00e9sistance \u00e0 la compression de certaines briques isolantes est faible ; il convient donc de pr\u00e9voir des joints de dilatation suffisants lors de la pose de la ma\u00e7onnerie afin d\u2019\u00e9viter toute dilatation et extrusion de celle-ci \u00e0 haute temp\u00e9rature. Lors de la conception, il convient de pr\u00e9voir un espace appropri\u00e9 entre la couche isolante et la t\u00f4le d'enveloppe du four, et de remplir cet espace avec des mat\u00e9riaux isolants en poudre afin de permettre la dilatation du corps du four.
\n(3) Les briques isolantes ne peuvent pas supporter de charges lourdes. \u00c0 l'exception de leur propre poids, le poids du four ne peut pas reposer sur les briques r\u00e9sistantes aux hautes temp\u00e9ratures.
\n(4) Le mat\u00e9riau isolant pr\u00e9sente de nombreux trous, et sa porosit\u00e9 est g\u00e9n\u00e9ralement sup\u00e9rieure \u00e0 70%, ce qui le rend susceptible d'absorber l'humidit\u00e9. Certains \u00e9l\u00e9ments chauffants \u00e9lectriques du four sont constitu\u00e9s de fils de molybd\u00e8ne, et ces derniers s\u2019oxydent facilement au contact de la vapeur d\u2019eau qui s\u2019\u00e9vapore des mat\u00e9riaux du four \u00e0 haute temp\u00e9rature. Bien s\u00fbr, le four de chauffage peut faire l\u2019objet d\u2019exigences strictes, mais il est surtout important d\u2019utiliser autant que possible des mat\u00e9riaux de four de chauffage secs.<\/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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