{"id":9214,"date":"2021-06-18T02:48:09","date_gmt":"2021-06-18T02:48:09","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=9214"},"modified":"2021-06-18T02:48:40","modified_gmt":"2021-06-18T02:48:40","slug":"foam-ceramic-filter-production","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/foam-ceramic-filter-production\/","title":{"rendered":"Fabrication de filtres en c\u00e9ramique expans\u00e9e"},"content":{"rendered":"

La mousse de polyur\u00e9thane servant de support \u00e0 la fabrication de filtres en c\u00e9ramique expans\u00e9e, c'est la porosit\u00e9 de cette mousse qui d\u00e9termine celle de la c\u00e9ramique expans\u00e9e produite. Pour obtenir un produit pr\u00e9sentant un taux de per\u00e7age \u00e9lev\u00e9, il est n\u00e9cessaire de choisir une \u00e9ponge en polyur\u00e9thane pr\u00e9sentant elle-m\u00eame un taux de per\u00e7age \u00e9lev\u00e9 ; de plus, le maillage de l\u2019\u00e9ponge doit \u00eatre uniforme, sans trous borgnes, et la r\u00e9partition des fils doit \u00eatre nette. Par cons\u00e9quent, la porosit\u00e9 de l\u2019\u00e9ponge et la qualit\u00e9 de son maillage ont un impact direct sur la porosit\u00e9 et la qualit\u00e9 du maillage du filtre en c\u00e9ramique expans\u00e9e.<\/p>\n

Les propri\u00e9t\u00e9s de l'\u00e9ponge de polyur\u00e9thane ont \u00e9galement une grande influence sur la r\u00e9sistance du produit, notamment en ce qui concerne la r\u00e9sistance de la pi\u00e8ce crue apr\u00e8s s\u00e9chage et l'impact de cette r\u00e9sistance lorsque l'\u00e9ponge se volatilise pendant le processus de frittage.<\/p>\n

L'influence de la r\u00e9sistance du corps cru apr\u00e8s s\u00e9chage sur le produit final se manifeste principalement par les dommages subis par le corps cru lors de l'op\u00e9ration de projection de b\u00e9ton. Plus la r\u00e9sistance du corps cru s\u00e9ch\u00e9 est \u00e9lev\u00e9e, moins il subit de dommages pendant l'op\u00e9ration, et plus la r\u00e9sistance du produit fritt\u00e9 est \u00e9lev\u00e9e. \u00c0 l'inverse, plus la r\u00e9sistance du produit est faible. Plus la r\u00e9sistance et l'\u00e9lasticit\u00e9 de l'\u00e9ponge de polyur\u00e9thane sont \u00e9lev\u00e9es, plus la r\u00e9sistance du corps apr\u00e8s enduction est \u00e9lev\u00e9e.<\/p>\n

Lors du frittage et de la volatilisation de l'\u00e9ponge de polyur\u00e9thane, plus la r\u00e9sistance de l'\u00e9bauche est \u00e9lev\u00e9e et plus la volatilisation de l'\u00e9ponge est lente, plus le degr\u00e9 de d\u00e9t\u00e9rioration est faible et plus la r\u00e9sistance du produit obtenu est \u00e9lev\u00e9e. Bien entendu, les principaux facteurs qui influencent la r\u00e9sistance du produit sont la composition de la barbotine c\u00e9ramique, la formulation et le syst\u00e8me de frittage.<\/p>\n

\"Fabrication<\/p>\n

La densit\u00e9, le point de fusion, la r\u00e9sistance, l'\u00e9lasticit\u00e9 et d'autres propri\u00e9t\u00e9s de l'\u00e9ponge en polyur\u00e9thane ont une incidence directe sur la qualit\u00e9 des filtres en c\u00e9ramique expans\u00e9e, notamment en ce qui concerne les deux points suivants :<\/p>\n

(1) Les c\u00e9ramiques expans\u00e9es compos\u00e9es de diff\u00e9rents mat\u00e9riaux imposent des exigences diff\u00e9rentes en mati\u00e8re de performances de l'\u00e9ponge de polyur\u00e9thane. Parmi celles-ci, c\u00e9ramiques en mousse de zircone<\/a> imposent les exigences les plus \u00e9lev\u00e9es en mati\u00e8re de performances des supports en mousse de polyur\u00e9thane. La densit\u00e9 de la mousse de polyur\u00e9thane doit \u00eatre sup\u00e9rieure \u00e0 0,045 g\/cm\u00b3, le taux de perforation sup\u00e9rieur \u00e0 85% et le point de fusion 180 \u00e0 200 \u00b0C, une bonne \u00e9lasticit\u00e9 et une r\u00e9sistance \u00e0 la traction sup\u00e9rieure \u00e0 12 kPa. Les c\u00e9ramiques en mousse de carbure de silicium ont des exigences relativement faibles en mati\u00e8re de performances de l\u2019\u00e9ponge de polyur\u00e9thane ; c\u00e9ramiques en mousse d'alumine<\/a> pr\u00e9sentent les exigences de performance les plus faibles en mati\u00e8re d'\u00e9ponge de polyur\u00e9thane.<\/p>\n

(2) L'\u00e9lasticit\u00e9, la porosit\u00e9 et la r\u00e9sistance de l'\u00e9ponge de polyur\u00e9thane ont une incidence plus importante sur le retrait final, la porosit\u00e9 et la r\u00e9sistance du produit en c\u00e9ramique alv\u00e9olaire<\/a>. La porosit\u00e9 transversale est principalement influenc\u00e9e par l'\u00e9ponge ; celle-ci pr\u00e9sente une bonne \u00e9lasticit\u00e9, une porosit\u00e9 transversale \u00e9lev\u00e9e et une r\u00e9sistance \u00e9lev\u00e9e. Plus le retrait du produit correspondant est faible, plus le taux de porosit\u00e9 est \u00e9lev\u00e9 et plus la r\u00e9sistance est grande ; \u00e0 l'inverse, plus le produit se r\u00e9tracte, plus le taux de porosit\u00e9 est faible et plus la r\u00e9sistance est faible.<\/p>","protected":false},"excerpt":{"rendered":"

As the polyurethane sponge is used as the carrier for foam ceramic filter production, the porosity of the polyurethane sponge itself determines the porosity of…<\/p>","protected":false},"author":1,"featured_media":9215,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[7457,7301,7298,7456,11996,7293,11990,11997,11995,11994,11991,11992,7291,11989,7294,11993,7297,7300,11998,7295,7299,7296,11999],"class_list":["post-9214","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-alumina-ceramic-foam-filter-molten-aluminium-filtration","tag-casting-filter-molten-aluminium-filtration","tag-ceramic-disc-filter-molten-aluminium-filtration","tag-ceramic-filter-for-foundry-molten-aluminium-filtration","tag-ceramic-filter-malaysia-molten-aluminium-filtration","tag-ceramic-filter-molten-aluminium-filtration","tag-ceramic-filter-supplier-molten-aluminium-filtration","tag-ceramic-foam-filter-china-molten-aluminium-filtration","tag-ceramic-foam-filter-manufacturers-in-india-molten-aluminium-filtration","tag-ceramic-foam-filter-manufacturers-molten-aluminium-filtration","tag-ceramic-foam-filter-manufacturing-process-molten-aluminium-filtration","tag-ceramic-foam-filter-suppliers-molten-aluminium-filtration","tag-ceramic-foam-filters-for-casting-molten-aluminium-filtration","tag-ceramic-foam-filters-molten-aluminium-filtration","tag-foam-ceramic-filter-molten-aluminium-filtration","tag-foam-filter-manufacturers-molten-aluminium-filtration","tag-foundry-coatings-molten-aluminium-filtration","tag-foundry-filter-molten-aluminium-filtration","tag-honeycomb-ceramic-filter-molten-aluminium-filtration","tag-lanik-ceramic-foam-filters-molten-aluminium-filtration","tag-molten-metal-filtration-molten-aluminium-filtration","tag-porous-filter-material-molten-aluminium-filtration","tag-silicon-carbide-ceramic-foam-filter-molten-aluminium-filtration"],"yoast_head":"\nFoam 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