{"id":7482,"date":"2021-01-12T08:02:50","date_gmt":"2021-01-12T08:02:50","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7482"},"modified":"2021-01-12T08:02:50","modified_gmt":"2021-01-12T08:02:50","slug":"ceramic-foam-filters-for-aluminium","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/ceramic-foam-filters-for-aluminium\/","title":{"rendered":"Filtres en mousse c\u00e9ramique pour l'aluminium"},"content":{"rendered":"

L'utilisation de filtres en mousse c\u00e9ramique pour l'aluminium a pour principal objectif d'\u00e9liminer les inclusions pr\u00e9sentes dans l'aluminium fondu. Ces inclusions se pr\u00e9sentent g\u00e9n\u00e9ralement sous trois formes : des oxydes m\u00e9talliques, des corps \u00e9trangers tels que des \u00e9clats de mat\u00e9riaux r\u00e9fractaires, et des particules introduites lors du traitement de la masse fondue.<\/p>\n

En r\u00e8gle g\u00e9n\u00e9rale, il existe trois m\u00e9thodes pour \u00e9liminer les particules en suspension dans le bain fondu : la pr\u00e9cipitation, o\u00f9 les particules s'accumulent au fond du bain fondu ; la flottation, o\u00f9 les inclusions remontent \u00e0 la surface du bain fondu ; et la filtration, o\u00f9 les particules sont s\u00e9par\u00e9es du bain fondu \u00e0 l'aide d'un milieu poreux.<\/p>\n

Lorsque la densit\u00e9 et le diam\u00e8tre des particules sont \u00e9lev\u00e9s, une s\u00e9dimentation naturelle se produit g\u00e9n\u00e9ralement, et la s\u00e9dimentation statique des particules de taille inf\u00e9rieure \u00e0 90 pm n'est pas tr\u00e8s efficace. Les bulles ou le flux de mati\u00e8re en fusion g\u00e9n\u00e9r\u00e9s lors du d\u00e9gazage traditionnel ou traitement d'affinage par flux<\/a> Ce proc\u00e9d\u00e9 entra\u00eene la remont\u00e9e des particules d'inclusion \u00e0 la surface de la masse fondue. Dans la plupart des cas, ce m\u00e9canisme permet d'\u00e9liminer efficacement les inclusions de plus de 30 \u00b5m.<\/p>\n

\"Flux<\/p>\n

La filtration d\u00e9signe le processus au cours duquel le m\u00e9tal en fusion s'\u00e9coule \u00e0 travers des sph\u00e8res dispos\u00e9es de mani\u00e8re tr\u00e8s dense, des tissus en fibre de verre, des mailles m\u00e9talliques, filtres en c\u00e9ramique alv\u00e9ol\u00e9e<\/a>, ou d'autres mat\u00e9riaux poreux, pour s\u00e9parer les inclusions de la masse fondue. L'avantage des filtres en mousse c\u00e9ramique pour l'aluminium r\u00e9side dans leur capacit\u00e9 \u00e0 \u00e9liminer les particules d'inclusion dont le diam\u00e8tre est bien inf\u00e9rieur \u00e0 celui des al\u00e9sages.<\/p>\n

Lorsque le bain d'alliage d'aluminium n'est pas filtr\u00e9, la pr\u00e9sence d'un grand nombre d'inclusions augmente la viscosit\u00e9 du liquide et r\u00e9duit sa fluidit\u00e9 ; au cours du processus de solidification, le canal d'alimentation entre les dendrites risque alors de se boucher, ce qui entra\u00eene la formation de r\u00e9tr\u00e9cissements et de pores microscopiques.<\/p>\n

Par ailleurs, ces taches d'impuret\u00e9s vont \u00e9galement adsorber des bulles, former des pores dans l'\u00e9chantillon, devenir une source de microfissures et r\u00e9duire les performances de l'alliage.<\/p>\n

De plus, comme les inclusions se r\u00e9partissent principalement au niveau des joints de grains apr\u00e8s la solidification de l'alliage, la force d'adh\u00e9rence entre les grains est r\u00e9duite, ce qui entra\u00eene la rupture des joints de grains lorsqu'une contrainte est appliqu\u00e9e \u00e0 l'\u00e9chantillon.<\/p>","protected":false},"excerpt":{"rendered":"

The main purpose of using ceramic foam filters for aluminium is for removing inclusions in the molten aluminium. Inclusions usually exist in the melt in…<\/p>","protected":false},"author":1,"featured_media":7483,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-7482","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nCeramic Foam Filters for Aluminium, Molten Metal Filtration<\/title>\n<meta name=\"description\" content=\"The ceramic foam filters for aluminium can remove inclusion particles whose diameter is much smaller than the through-hole.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/fr\/ceramic-foam-filters-for-aluminium\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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