{"id":3053,"date":"2020-07-25T11:19:48","date_gmt":"2020-07-25T11:19:48","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3053"},"modified":"2020-10-19T06:50:00","modified_gmt":"2020-10-19T06:50:00","slug":"advanced-ceramic-filter","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/advanced-ceramic-filter\/","title":{"rendered":"Filtre en c\u00e9ramique de pointe"},"content":{"rendered":"

L'utilisation d'un filtre en c\u00e9ramique de pointe dans un mat\u00e9riau granulaire \u00e0 base d'oxyde d'aluminium devrait appara\u00eetre comme un choix \u00e9vident pour tout sp\u00e9cialiste des mat\u00e9riaux r\u00e9fractaires utilis\u00e9s pour contenir l'aluminium fondu et ses alliages.<\/p>\n

L'alumine est relativement inerte sur le plan chimique dans l'aluminium fondu et ses alliages courants, y compris ceux contenant du magn\u00e9sium.<\/p>\n

Le filtre en c\u00e9ramique de pointe est \u00e9galement largement utilis\u00e9 sous forme de mat\u00e9riau granulaire dans les mat\u00e9riaux r\u00e9fractaires destin\u00e9s aux fours, tant pour la fusion que pour le confinement des alliages d'aluminium en fusion.<\/p>\n

Par ailleurs, avant l'apparition des pi\u00e8ces de rechange jetables filtres en mousse c\u00e9ramique pour l'aluminium fondu<\/a>, on a utilis\u00e9 des filtres contenant une charge d\u2019alumine lamellaire. Les filtres \u00e0 charge sont de grands r\u00e9cipients chauff\u00e9s contenant des grains d\u2019alumine lamellaire non li\u00e9s, utilis\u00e9s pour des coul\u00e9es r\u00e9p\u00e9t\u00e9es pendant plusieurs jours, voire plusieurs semaines. La longue dur\u00e9e d\u2019exposition du m\u00e9tal en fusion \u00e0 des mat\u00e9riaux agr\u00e9g\u00e9s non li\u00e9s, comme c\u2019est le cas dans les filtres en mousse c\u00e9ramique contenant des charges et des r\u00e9fractaires, n\u00e9cessite l\u2019utilisation d\u2019un mat\u00e9riau granulaire chimiquement inerte tel que l\u2019oxyde d\u2019aluminium.<\/p>\n

\"Filtre<\/p>\n

Cependant, l'alumine pr\u00e9sente un coefficient de dilatation thermique lin\u00e9aire relativement \u00e9lev\u00e9 (8,0 \u00d7 10\u207b\u2076 \/ \u00b0C), et les formes monolithiques d\u2019alumine, telles que les filtres en mousse c\u00e9ramique, pr\u00e9sentent une faible r\u00e9sistance \u00e0 la chaleur en raison des contraintes thermiques \u00e9lev\u00e9es g\u00e9n\u00e9r\u00e9es par la combinaison des gradients thermiques r\u00e9sultant d\u2019un chauffage in\u00e9gal et d\u2019un coefficient de dilatation thermique \u00e9lev\u00e9.<\/p>\n

Au cours du pr\u00e9chauffage et du premier contact avec le m\u00e9tal en fusion, le mat\u00e9riau filtrant en mousse c\u00e9ramique r\u00e9ticul\u00e9e peut se fissurer ou se briser, ce qui entra\u00eene la p\u00e9n\u00e9tration du mat\u00e9riau filtrant dans le lingot ou la billette, o\u00f9 il se transforme en inclusion.
\nDe plus, lorsque le filtre en c\u00e9ramique alv\u00e9olaire \u00e0 base d'alumine est maintenu dans le bol filtrant pendant le pr\u00e9chauffage et l'utilisation, des contraintes de compression transversales \u00e9lev\u00e9es peuvent appara\u00eetre en raison du coefficient de dilatation thermique \u00e9lev\u00e9 du filtre, ce qui entra\u00eene la destruction de celui-ci sous l'effet de la compression.<\/p>","protected":false},"excerpt":{"rendered":"

Advanced ceramic filter is used in aluminum oxide granular material should seem an obvious choice to any person skilled in the art of refractory materials…<\/p>","protected":false},"author":1,"featured_media":5777,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,138],"tags":[1720,1721],"class_list":["post-3053","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ceramic-foam-filter","category-seo","tag-advanced-ceramic-filter","tag-ceramic-foam-filters-for-molten-aluminum"],"yoast_head":"\nAdvanced Ceramic Filter,Ceramic Foam Filters for Molten Aluminum<\/title>\n<meta name=\"description\" content=\"Advanced ceramic filter is widely used as a granular material in refractories, both for melting and for containing molten aluminum alloys.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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