{"id":9069,"date":"2021-06-04T03:06:46","date_gmt":"2021-06-04T03:06:46","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=9069"},"modified":"2021-06-07T01:22:40","modified_gmt":"2021-06-07T01:22:40","slug":"foam-ceramic-filters-for-foundries","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/foam-ceramic-filters-for-foundries\/","title":{"rendered":"Filtres en c\u00e9ramique expans\u00e9e pour fonderies"},"content":{"rendered":"

La filtration de l'aluminium en fusion dans les fonderies s'effectue \u00e0 l'aide de filtres en mousse c\u00e9ramique. Il s'agit d'un filtre \u00e0 usage unique, fabriqu\u00e9 \u00e0 partir de mousse c\u00e9ramique poreuse et dont la taille des pores est strictement contr\u00f4l\u00e9e. En raison de leur simplicit\u00e9 d'utilisation et des bons r\u00e9sultats obtenus \u00e0 court terme, ces filtres constituent g\u00e9n\u00e9ralement le seul \u00e9quipement de filtration utilis\u00e9 dans de nombreuses fonderies.<\/p>\n

Il ne suffit pas que le filtre en c\u00e9ramique alv\u00e9olaire pr\u00e9sente une bonne efficacit\u00e9 de filtration. Il doit \u00e9galement offrir un d\u00e9bit \u00e9lev\u00e9 et constant, une bonne r\u00e9sistance, une grande capacit\u00e9 et une bonne pr\u00e9cision dimensionnelle. Tout cela doit \u00eatre obtenu au co\u00fbt le plus bas possible. Certains de ces param\u00e8tres sont contradictoires : par exemple, si la capacit\u00e9 du filtre est tr\u00e8s \u00e9lev\u00e9e, l\u2019efficacit\u00e9 de filtration peut s\u2019en trouver affect\u00e9e. Par cons\u00e9quent, le filtre le plus efficace est celui qui a \u00e9t\u00e9 soigneusement con\u00e7u pour offrir les meilleures performances sur l'ensemble de ces param\u00e8tres.<\/p>\n

Les trois param\u00e8tres cl\u00e9s des filtres en c\u00e9ramique expans\u00e9e destin\u00e9s aux fonderies sont les suivants :<\/strong><\/p>\n

Surface filtrante : plus la surface est grande, plus le d\u00e9bit potentiel de m\u00e9tal est important. Toutefois, en raison du risque de dommages, les grandes tuiles peuvent \u00eatre difficiles \u00e0 manipuler.<\/p>\n

Taille des pores \u2014 Plus la taille des pores est petite, plus l'efficacit\u00e9 du filtre est \u00e9lev\u00e9e. Cependant, cela risque davantage de dissuader les acteurs \u00e0 moyen terme.<\/p>\n

\u00c9paisseur : plus le filtre est \u00e9pais, plus l'efficacit\u00e9 de filtration est \u00e9lev\u00e9e. Cependant, il peut \u00eatre plus difficile de le mettre en marche au d\u00e9but.<\/p>\n

\"Filtration<\/p>\n

Pour les produits phares inclusifs, certaines fonderies utilisent filtres \u00e0 lit profond<\/a>. Cela consiste g\u00e9n\u00e9ralement \u00e0 filtrer l'aluminium fondu \u00e0 travers des lits de m\u00e9dias c\u00e9ramiques de diff\u00e9rentes tailles. Bien que ces syst\u00e8mes soient g\u00e9n\u00e9ralement tr\u00e8s efficaces (g\u00e9n\u00e9ralement sup\u00e9rieurs \u00e0 85%), leur exploitation peut s'av\u00e9rer co\u00fbteuse. Cela s'explique par l'espace au sol n\u00e9cessaire et la dur\u00e9e de vie limit\u00e9e des m\u00e9dias filtrants. Ceux-ci doivent g\u00e9n\u00e9ralement \u00eatre remplac\u00e9s et \u00e9limin\u00e9s \u00e0 intervalles r\u00e9guliers.<\/p>\n

Pour certaines applications extr\u00eamement critiques, on utilise g\u00e9n\u00e9ralement des filtres \u00e0 tubes en c\u00e9ramique, plus co\u00fbteux.<\/p>\n

Gr\u00e2ce \u00e0 la filtration en profondeur de filtre en mousse c\u00e9ramique<\/a> et gr\u00e2ce \u00e0 des particules c\u00e9ramiques dot\u00e9es d'un rev\u00eatement actif, il est possible d'\u00e9liminer les inclusions pr\u00e9sentes dans l'aluminium fondu. Les r\u00e9sultats de l'essai de traction ont montr\u00e9 que l'allongement de l'\u00e9prouvette filtr\u00e9e avait augment\u00e9 de 17,931 TP3T, mais que la r\u00e9sistance \u00e0 la traction n'avait pas vari\u00e9.<\/p>\n

L'examen au microscope \u00e9lectronique \u00e0 balayage (MEB) a montr\u00e9 que les fissures secondaires et les bosses pr\u00e9sentes dans l'\u00e9prouvette de traction filtr\u00e9e \u00e9taient plus fines et plus uniformes que celles observ\u00e9es dans l'\u00e9prouvette de traction non filtr\u00e9e. De plus, l\u2019examen m\u00e9tallographique a r\u00e9v\u00e9l\u00e9 que l\u2019\u00e9chantillon filtr\u00e9 ne comportait que quelques inclusions d\u2019un diam\u00e8tre d\u2019environ 6 \u03bcm, tandis que des inclusions d\u2019un diam\u00e8tre d\u2019environ 40 \u03bcm ont \u00e9t\u00e9 observ\u00e9es dans l\u2019\u00e9chantillon non filtr\u00e9. L'efficacit\u00e9 de filtration des particules c\u00e9ramiques rev\u00eatues est sup\u00e9rieure \u00e0 celle du filtre en mousse c\u00e9ramique rev\u00eatu. Le rev\u00eatement actif permet de pi\u00e9ger efficacement les impuret\u00e9s et de dissoudre l'Al\u2082O\u2083 qu'elles contiennent au cours du processus de filtration.<\/p>","protected":false},"excerpt":{"rendered":"

The molten aluminum filtration uses foam ceramic filters for foundries. This is a single-use disposable filter, made of porous ceramic foam., and has a strictly…<\/p>","protected":false},"author":1,"featured_media":9072,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39],"tags":[1598,1599,1595,485,1455,1454,432,486,1606,1601,1600,1456,422,1597,1605,418,1453,417,412,1604,298,1603,1602,1596,1594,405],"class_list":["post-9069","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-foundry-ceramic-filters","tag-20-ppi-filter-foam","tag-30-ppi-filter-foam","tag-alumina-filter","tag-aluminum-casting-filter","tag-asian-foundry-filters","tag-casting-filter","tag-ceramic-filter-foundry","tag-ceramic-filter-manufacturers","tag-ceramic-filter-price","tag-ceramic-foam-filter-manufacturer-process","tag-ceramic-foam-filter-manufacturers-india","tag-ceramic-foundry-filter","tag-filter-foam-manufacturers","tag-filter-foundry","tag-foam-furnace-filter","tag-foundry-ceramic-filters","tag-foundry-filter","tag-foundry-filters","tag-metal-foam-filter","tag-open-cell-foam-filter-material","tag-porous-ceramic-filter","tag-reticulated-foam-filter","tag-sic-ceramic-foam-filter","tag-silicon-carbide-ceramic-filter","tag-silicon-carbide-filter","tag-silicon-carbide-foam-filter"],"yoast_head":"\nFoam Ceramic Filters for Foundries -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"The molten aluminum filtration uses foam ceramic filters for foundries. 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