{"id":7348,"date":"2021-01-05T05:18:41","date_gmt":"2021-01-05T05:18:41","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7348"},"modified":"2022-03-16T01:46:36","modified_gmt":"2022-03-16T01:46:36","slug":"alumina-ceramic-foam-filter-material","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/alumina-ceramic-foam-filter-material\/","title":{"rendered":"Mat\u00e9riau filtrant en mousse c\u00e9ramique d'alumine"},"content":{"rendered":"<p>Pour ceux qui connaissent bien les mat\u00e9riaux r\u00e9fractaires utilis\u00e9s pour contenir l'aluminium fondu et ses alliages, l'utilisation de particules d'alumine dans un mat\u00e9riau filtrant en mousse c\u00e9ramique semble \u00eatre un choix \u00e9vident.<\/p>\n<p>L'alumine est relativement inerte chimiquement dans l'aluminium fondu et ses alliages courants, y compris les alliages de magn\u00e9sium. Elle est \u00e9galement largement utilis\u00e9e sous forme de particules dans les mat\u00e9riaux r\u00e9fractaires destin\u00e9s \u00e0 la fusion et au maintien \u00e0 temp\u00e9rature des alliages d'aluminium fondus dans les fours. De plus, avant la mise au point d'un filtre en mousse c\u00e9ramique jetable, on utilisait un filtre \u00e0 lit d'alumine en forme de plaque pour <a href=\"http:\/\/www.alalloycasting.com\/fr\/molten-aluminum-filtration\/\">filtrer l'aluminium fondu<\/a>.<\/p>\n<p>Le <a href=\"http:\/\/www.alalloycasting.com\/fr\/deep-bed-filter\/\">filtre de lit<\/a> Il s'agit d'un grand r\u00e9cipient de chauffage contenant des particules d'alumine en paillettes non agglom\u00e9r\u00e9es, qui peut \u00eatre utilis\u00e9 pour des coul\u00e9es r\u00e9p\u00e9t\u00e9es pendant plusieurs jours, voire plusieurs semaines. Comme dans le cas des filtres \u00e0 lit et des mat\u00e9riaux r\u00e9fractaires, l'exposition prolong\u00e9e du m\u00e9tal en fusion \u00e0 un agr\u00e9gat non agglom\u00e9r\u00e9 n\u00e9cessite l'utilisation de mat\u00e9riaux particulaires chimiquement inertes, tels que l'alumine.<\/p>\n<p>Cependant, l'alumine pr\u00e9sente un coefficient de dilatation thermique lin\u00e9aire \u00e9lev\u00e9 (8,0 \u00d7 10\u207b\u2076\/\u00b0C) et, en raison des contraintes thermiques importantes g\u00e9n\u00e9r\u00e9es par cette combinaison, la forme globale des pi\u00e8ces en alumine, telles que les filtres en mousse c\u00e9ramique, offre une faible r\u00e9sistance aux chocs thermiques. Les variations de gradient thermique sont dues \u00e0 un chauffage in\u00e9gal et \u00e0 un coefficient de dilatation thermique \u00e9lev\u00e9. Lors du pr\u00e9chauffage et du premier contact avec le m\u00e9tal en fusion, le mat\u00e9riau du filtre en mousse c\u00e9ramique peut se rompre sous l\u2019effet de la chaleur ou se d\u00e9coller, ce qui entra\u00eene la migration de particules du mat\u00e9riau du filtre dans le lingot ou la billette sous forme d\u2019inclusions. De plus, lorsque le filtre en alumine expans\u00e9e est confin\u00e9 dans la cuvette de filtration pendant le pr\u00e9chauffage et l\u2019utilisation, des contraintes de compression lat\u00e9rales \u00e9lev\u00e9es peuvent \u00eatre g\u00e9n\u00e9r\u00e9es en raison du taux de dilatation thermique \u00e9lev\u00e9 du filtre, entra\u00eenant une d\u00e9faillance par compression de celui-ci.<\/p>\n<p>L'orthophosphate d'aluminium (Al(H\u2082PO\u2084)\u2083) est largement utilis\u00e9 comme liant r\u00e9fractaire dans l'industrie m\u00e9tallurgique. Il pr\u00e9sente une bonne r\u00e9sistance \u00e0 l'\u00e9tat cru lorsqu'il est s\u00e9ch\u00e9 \u00e0 une temp\u00e9rature relativement basse, un faible retrait \u00e0 l'\u00e9tat cru, ainsi qu'une bonne r\u00e9sistance lors du processus de cuisson ult\u00e9rieur. L'orthophosphate d'aluminium est relativement bon march\u00e9, largement disponible et n\u00e9cessite une temp\u00e9rature de cuisson relativement basse (1 100 \u00b0C) pour obtenir la liaison finale au phosphate d'aluminium (AlPO\u2084). Pour ces raisons, et en raison du co\u00fbt relativement faible de l\u2019orthophosphate d\u2019aluminium, ce mat\u00e9riau est largement utilis\u00e9 pour fabriquer des filtres en mousse c\u00e9ramique destin\u00e9s \u00e0 la filtration de l\u2019aluminium fondu. Cependant, dans de nombreux alliages d\u2019aluminium disponibles dans le commerce, la liaison de phosphate d\u2019aluminium ainsi obtenue r\u00e9agit facilement avec le magn\u00e9sium.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7287\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/12\/Alumina-Ceramic-Foam-Filter-for-Refining-1.jpg\" alt=\"Filtre en mousse c\u00e9ramique d&#039;alumine pour le raffinage\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Alumina-Ceramic-Foam-Filter-for-Refining-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Alumina-Ceramic-Foam-Filter-for-Refining-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>AdTech propose <a href=\"http:\/\/www.alalloycasting.com\/fr\/alumina-ceramic-foam-filter\/\">filtre en mousse c\u00e9ramique d'alumine<\/a> pour l'aluminium en fusion. Le filtre pr\u00e9sente une r\u00e9sistance \u00e9lev\u00e9e aux chocs thermiques, une grande r\u00e9sistance \u00e0 la corrosion, une r\u00e9sistance m\u00e9canique suffisante, un co\u00fbt de production \u00e9conomique, un caract\u00e8re respectueux de l'environnement et une densit\u00e9 inf\u00e9rieure \u00e0 celle des solutions existantes. La p\u00e2te de fabrication des filtres en mousse c\u00e9ramique contient de l'alumine, de la silice, des compos\u00e9s de calcium, des compos\u00e9s de bore et d'autres composants. La mousse \u00e0 cellules ouvertes est impr\u00e9gn\u00e9e de cette suspension afin de volatiliser et de fritter le support.<\/p>\n<h2>Avantages du mat\u00e9riau filtrant en mousse c\u00e9ramique d'alumine<\/h2>\n<ul>\n<li>Haute r\u00e9sistance aux chocs thermiques : lors du pr\u00e9chauffage ou au contact du m\u00e9tal en fusion, le mat\u00e9riau ne doit ni se fissurer ni s'\u00e9cailler. Lorsque le mat\u00e9riau en mousse c\u00e9ramique est install\u00e9 dans le <a href=\"http:\/\/www.alalloycasting.com\/fr\/cff-filter-box\/\">cuve de filtration<\/a>, il doit pr\u00e9senter un faible coefficient de dilatation thermique afin de r\u00e9duire au minimum les contraintes de compression lat\u00e9rales.<\/li>\n<li>R\u00e9sistance \u00e0 la corrosion : le mat\u00e9riau filtrant en mousse c\u00e9ramique d'alumine ne doit pas pr\u00e9senter de r\u00e9action notable dans la plage d'application pr\u00e9vue (dur\u00e9e, temp\u00e9rature, teneur en alliage) et doit conserver sa mouillabilit\u00e9 par l'aluminium fondu et ses alliages courants.<\/li>\n<li>R\u00e9sistance suffisante \u00e0 la flexion et \u00e0 la compression.<\/li>\n<li>\u00c9conomie de production.<\/li>\n<li>Faible densit\u00e9 et poids r\u00e9duit, facile \u00e0 utiliser.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>For those familiar with the refractory materials used to contain molten aluminum and its alloys, the use of alumina particles in ceramic foam filter material&hellip;<\/p>","protected":false},"author":1,"featured_media":7349,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-7348","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Alumina Ceramic Foam Filter Material for Molten Aluminum<\/title>\n<meta name=\"description\" content=\"The alumina ceramic foam filter material is also widely used as a particulate material in refractories for holding molten aluminum.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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