{"id":11324,"date":"2021-11-21T08:20:07","date_gmt":"2021-11-21T08:20:07","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=11324"},"modified":"2021-11-23T01:50:07","modified_gmt":"2021-11-23T01:50:07","slug":"filtres-pour-metal-fondu","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/ar\/filtres-pour-metal-fondu\/","title":{"rendered":"filtres pour m\u00e9tal fondu"},"content":{"rendered":"

On a maintenant trouv\u00e9 que des filtres am\u00e9lior\u00e9s pour le m\u00e9tal fondu sont obtenus si la mousse c\u00e9ramique est r\u00e9alis\u00e9e \u00e0 partir d’une composition comprenant du carbure de silicium, de l’alumine, du sol de silice collo\u00efdale et une proportion mineure de fibre d’aluminosilicate.<\/p>\n

Selon l’invention, il est propos\u00e9 un filtre en mousse c\u00e9ramique fabriqu\u00e9 \u00e0 partir d’une composition comprenant du carbure de silicium, de l’alumine, de la silice d\u00e9riv\u00e9e du sol de silice collo\u00efdale et des fibres d’aluminosilicate et qui a \u00e9t\u00e9 cuit \u00e0 une temp\u00e9rature telle que le filtre a une matrice c\u00e9ramique dans laquelle les fibres d’aluminosilicate sont sensiblement dissoutes.<\/p>\n

Les filtres pour m\u00e9tal fondu sont de pr\u00e9f\u00e9rence form\u00e9s \u00e0 partir d’une suspension aqueuse ayant une teneur en solides comprenant 20 \u00e0 50 % en poids de carbure de silicium, 20 \u00e0 50 % en poids d’alumine, 1,5 \u00e0 5,0 % en poids de silice d\u00e9riv\u00e9e du sol de silice collo\u00efdale et 1 \u00e0 3 % en poids de fibres d’aluminosilicate.<\/p>\n

La granulom\u00e9trie du carbure de silicium est de pr\u00e9f\u00e9rence de 1 \u00e0 80 microns, et la granulom\u00e9trie de l’alumine est de pr\u00e9f\u00e9rence de 1 \u00e0 40 microns. Les fibres d’aluminosilicate ont de pr\u00e9f\u00e9rence une longueur de 60 microns \u00e0 3 mm. Les sols de silice collo\u00efdale sont disponibles dans le commerce et ont une teneur en silice comprise entre 30 et 50 % en poids. La suspension aqueuse utilis\u00e9e pour produire le filtre de l’invention contiendra donc habituellement de 5 \u00e0 10 % en poids de sol de silice collo\u00efdale.<\/p>\n

Le filtre en mousse c\u00e9ramique peut \u00eatre fabriqu\u00e9 en utilisant un proc\u00e9d\u00e9 connu de fabrication d’une mousse c\u00e9ramique dans laquelle une mousse organique, g\u00e9n\u00e9ralement une mousse de polyur\u00e9thane, est impr\u00e9gn\u00e9e d’une suspension aqueuse de mat\u00e9riau c\u00e9ramique contenant un liant, la mousse impr\u00e9gn\u00e9e est s\u00e9ch\u00e9e pour \u00e9liminer l’eau et le filtre s\u00e9ch\u00e9 la mousse impr\u00e9gn\u00e9e est cuite pour br\u00fbler la mousse organique pour produire une mousse c\u00e9ramique.<\/p>\n

Pendant la fabrication, le filtre en mousse c\u00e9ramique<\/a> de l’invention doit \u00eatre cuit \u00e0 un minimum de 1150 DEG C. De pr\u00e9f\u00e9rence, la temp\u00e9rature de cuisson se situe dans la plage de 1200 DEG C \u00e0 1300 DEG C.<\/p>\n

Par cons\u00e9quent, selon une autre caract\u00e9ristique de l’invention, il est propos\u00e9 un proc\u00e9d\u00e9 de fabrication d’un filtre en mousse c\u00e9ramique comprenant la formation d’une suspension aqueuse contenant du carbure de silicium, de l’alumine, un sol de silice collo\u00efdale et des fibres d’aluminosilicate, l’impr\u00e9gnation d’une mousse organique avec la suspension, le s\u00e9chage la mousse impr\u00e9gn\u00e9e pour \u00e9liminer l’eau et cuire la mousse impr\u00e9gn\u00e9e s\u00e9ch\u00e9e \u00e0 une temp\u00e9rature d’au moins 1150 DEG C.<\/p>\n

Lorsque le filtre est cuit la silice collo\u00efdale, les fibres d’aluminosilicate et les particules plus fines d’alumine interagissent pour former une matrice c\u00e9ramique entourant le carbure de silicium et les particules d’alumine plus grossi\u00e8res et ayant une phase liante primaire de silicate d’aluminium. La dissolution substantielle des fibres d’aluminosilicate dans la matrice c\u00e9ramique peut \u00eatre d\u00e9montr\u00e9e par un examen microscopique du filtre en mousse c\u00e9ramique \u00e0 l’aide d’un microscope \u00e9lectronique \u00e0 balayage (MEB).<\/p>\n

La suspension peut \u00e9galement contenir d’autres additifs pour am\u00e9liorer les propri\u00e9t\u00e9s d’application de la suspension pendant l’impr\u00e9gnation de la mousse organique. Des exemples de tels additifs sont des agents rh\u00e9ologiques, tels que l’argile, la silice fum\u00e9e ou des agents \u00e9paississants organiques, des adjuvants de rev\u00eatement, tels que l’alcool polyvinylique et des agents antimousse.<\/p>\n

Si souhait\u00e9, les filtres de l’invention peuvent \u00eatre encore am\u00e9lior\u00e9s en les rev\u00eatant d’un mat\u00e9riau c\u00e9ramique suppl\u00e9mentaire de la m\u00eame composition apr\u00e8s s\u00e9chage et avant cuisson de la mousse organique impr\u00e9gn\u00e9e. Lorsque les filtres sont rev\u00eatus de cette mani\u00e8re, la masse de rev\u00eatement constituera g\u00e9n\u00e9ralement 5 \u00e0 10 % en poids du filtre fini.<\/p>\n

Les filtres de l’invention sont plus r\u00e9sistants et moins friables que les filtres en carbure de silicium \u00e0 liant phosphate et du fait qu’ils sont plus r\u00e9sistants, il est possible de les utiliser sous forme de sections plus minces, c’est-\u00e0-dire de l’ordre de 15 mm ou moins.<\/p>","protected":false},"excerpt":{"rendered":"

On a maintenant trouv\u00e9 que des filtres am\u00e9lior\u00e9s pour le m\u00e9tal fondu sont obtenus si la mousse c\u00e9ramique est r\u00e9alis\u00e9e \u00e0 partir d’une composition comprenant…<\/p>","protected":false},"author":1,"featured_media":11325,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[12848,12844,12855,12866,12859,12856,12843,12857,12858,12861,12868,12854,12862,12842,12863,12864,12846,12860,12852,12851,12847,12849,12865,12867,12845,12853,12850],"class_list":["post-11324","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-molten-metal-filter-in-algeria","tag-molten-metal-filter-in-belgium","tag-molten-metal-filter-in-benin","tag-molten-metal-filter-in-burkina-faso","tag-molten-metal-filter-in-burundi","tag-molten-metal-filter-in-cameroon","tag-molten-metal-filter-in-canada","tag-molten-metal-filter-in-central-africa","tag-molten-metal-filter-in-chad","tag-molten-metal-filter-in-comoros","tag-molten-metal-filter-in-congo","tag-molten-metal-filter-in-cote-divoire","tag-molten-metal-filter-in-djibouti","tag-molten-metal-filter-in-france","tag-molten-metal-filter-in-gabon","tag-molten-metal-filter-in-guinea","tag-molten-metal-filter-in-luxembourg","tag-molten-metal-filter-in-madagascar","tag-molten-metal-filter-in-mali","tag-molten-metal-filter-in-mauritania","tag-molten-metal-filter-in-monaco","tag-molten-metal-filter-in-morocco","tag-molten-metal-filter-in-niger","tag-molten-metal-filter-in-rwanda","tag-molten-metal-filter-in-switzerland","tag-molten-metal-filter-in-togo","tag-molten-metal-filter-in-tunisia"],"yoast_head":"\nfiltres 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