{"id":7647,"date":"2021-01-21T03:33:35","date_gmt":"2021-01-21T03:33:35","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7647"},"modified":"2021-01-22T09:28:00","modified_gmt":"2021-01-22T09:28:00","slug":"ceramic-foam-filtration-technology","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/ceramic-foam-filtration-technology\/","title":{"rendered":"Technologie de filtration par mousse c\u00e9ramique"},"content":{"rendered":"<p>Au cours des ann\u00e9es 1980, la technologie de filtration par mousse c\u00e9ramique a connu une adoption rapide et g\u00e9n\u00e9ralis\u00e9e sur le march\u00e9 pour une large gamme de produits en aluminium de haute qualit\u00e9, notamment les mat\u00e9riaux d\u2019emballage rigides, les feuilles lithographiques, les produits a\u00e9rospatiaux tels que les t\u00f4les, les plaques, les pi\u00e8ces forg\u00e9es et les profil\u00e9s extrud\u00e9s ; les garnitures \u00e0 finition brillante, les tubes de condenseurs, les feuilles minces, les profil\u00e9s architecturaux, les alliages de fonderie, ainsi que les c\u00e2bles et fils conducteurs \u00e9lectriques.<\/p>\n<p>L'adoption rapide par le march\u00e9 et l'essor de la technologie de filtration par mousse c\u00e9ramique dans les ateliers de fonderie d'aluminium de tous types et de tous niveaux de sophistication s'expliquent par les raisons suivantes :<\/p>\n<ul>\n<li>Facilit\u00e9 d'utilisation et acceptation par les op\u00e9rateurs ;<\/li>\n<li>Flexibilit\u00e9 op\u00e9rationnelle ;<\/li>\n<li>Possibilit\u00e9 de se r\u00e9g\u00e9n\u00e9rer apr\u00e8s chaque lancement ;<\/li>\n<li>Faibles co\u00fbts d'exploitation variables ;<\/li>\n<li>Faible co\u00fbt d'installation ;<\/li>\n<li>Suppression efficace des inclusions ;<\/li>\n<li>Un faible encombrement, ce qui se traduisait par un espace au sol minimal n\u00e9cessaire \u00e0 l'installation.<\/li>\n<\/ul>\n<p>La premi\u00e8re version commerciale <a href=\"http:\/\/www.alalloycasting.com\/fr\/alumina-ceramic-foam-filters\/\">filtres en mousse c\u00e9ramique<\/a> \u00e9taient \u00e0 base d\u2019un mat\u00e9riau granulaire de chrome-alumine, d\u2019un liant \u00e0 base d\u2019orthophosphate d\u2019aluminium et d\u2019additifs \u00e0 base de bentonite et de kaolin destin\u00e9s \u00e0 am\u00e9liorer la rh\u00e9ologie de la boue. Le mat\u00e9riau granulaire de chrome-alumine \u00e9tait relativement co\u00fbteux et posait un probl\u00e8me potentiel d\u2019\u00e9limination en raison des inqui\u00e9tudes li\u00e9es \u00e0 la pr\u00e9sence \u00e9ventuelle de chrome hexavalent, substance canc\u00e9rig\u00e8ne av\u00e9r\u00e9e. La formulation \u00e0 base de chrome-alumine a ensuite \u00e9t\u00e9 remplac\u00e9e par une formulation \u201c enti\u00e8rement \u00e0 base d\u2019alumine \u201d int\u00e9grant des fibres d\u2019aluminosilicate et un collo\u00efde min\u00e9ral (additif argileux), tout en conservant le syst\u00e8me de liant \u00e0 base d\u2019orthophosphate d\u2019aluminium utilis\u00e9 dans les filtres \u00e0 chrome-alumine.<\/p>\n<p>Cette formulation de filtre \u201c 100 % alumine \u201d a par la suite \u00e9t\u00e9 largement utilis\u00e9e dans le monde entier et est devenue la \u201c norme industrielle \u201d pour les filtres en mousse c\u00e9ramique utilis\u00e9s dans les ateliers de coul\u00e9e d\u2019aluminium depuis plus de 25 ans. Malgr\u00e9 l\u2019utilisation tr\u00e8s r\u00e9pandue des filtres en mousse d\u2019alumine li\u00e9s au phosphate d\u2019aluminium, cette formulation pr\u00e9sente plusieurs inconv\u00e9nients majeurs. Les filtres au phosphate d\u2019aluminium pr\u00e9sentent une faible r\u00e9sistance aux chocs thermiques, ont tendance \u00e0 subir des d\u00e9faillances de compression lat\u00e9rales et perdent en r\u00e9sistance au cours de leur utilisation en raison de l\u2019attaque du liant \u00e0 base de phosphate d\u2019aluminium ; ils offrent par ailleurs une faible r\u00e9sistance aux attaques chimiques et \u00e0 l\u2019\u00e9rosion de la structure du filtre. De plus, des gaz de phosphine peuvent se d\u00e9gager des filtres usag\u00e9s, ce qui complique leur \u00e9limination.<\/p>\n<p>L'utilisation de grains d'alumine dans un filtre en mousse c\u00e9ramique semble \u00eatre un choix \u00e9vident pour quiconque conna\u00eet les mat\u00e9riaux r\u00e9fractaires utilis\u00e9s pour contenir l'aluminium fondu et ses alliages. L'alumine est relativement inerte chimiquement dans l'aluminium fondu et ses alliages courants, y compris ceux contenant du magn\u00e9sium. Elle est \u00e9galement largement utilis\u00e9e comme mat\u00e9riau granulaire dans les r\u00e9fractaires employ\u00e9s dans les fours destin\u00e9s \u00e0 la fois \u00e0 la fusion et au maintien \u00e0 temp\u00e9rature des alliages d'aluminium fondus.<\/p>\n<p>Par ailleurs, avant la mise au point du filtre en mousse c\u00e9ramique jetable \u00e0 usage unique, on utilisait des filtres \u00e0 lit d'alumine en plaques pour filtrer l'aluminium fondu. <a href=\"http:\/\/www.alalloycasting.com\/fr\/deep-bed-filtration\/\">Filtres de lit<\/a> Il s'agit de grandes cuves chauff\u00e9es contenant des grains d'alumine tabulaires non agglom\u00e9r\u00e9s, utilis\u00e9es pour des coul\u00e9es r\u00e9p\u00e9t\u00e9es sur une p\u00e9riode de plusieurs jours, voire plusieurs semaines. La longue dur\u00e9e d'exposition du m\u00e9tal en fusion aux mat\u00e9riaux agr\u00e9g\u00e9s non agglom\u00e9r\u00e9s, comme c'est le cas dans les filtres \u00e0 lit et les mat\u00e9riaux r\u00e9fractaires, n\u00e9cessite l'utilisation d'un mat\u00e9riau granulaire chimiquement inerte tel que l'alumine.<\/p>","protected":false},"excerpt":{"rendered":"<p>During the 1980&#8217;s there was rapid and widespread market acceptance of ceramic foam filtration technology for a broad range of high quality fabricated aluminum products&hellip;<\/p>","protected":false},"author":1,"featured_media":7668,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[485,1455,1454,1449,1451,1447,1456,1445,1448,1453,416,1444,1452,1450,1446,406],"class_list":["post-7647","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-casting-filter","tag-asian-foundry-filters","tag-casting-filter","tag-ceramic-candle-filter","tag-ceramic-disc-filter","tag-ceramic-foam-filter-china","tag-ceramic-foundry-filter","tag-foam-casting-aluminum","tag-foundry-coatings","tag-foundry-filter","tag-honeycomb-ceramic-filter","tag-lanik-ceramic-foam-filters","tag-molten-metal-filtration","tag-porous-aluminum-plate","tag-porous-filter-material","tag-silicon-carbide-ceramic-foam-filter"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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