{"id":3048,"date":"2020-07-25T11:04:27","date_gmt":"2020-07-25T11:04:27","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3048"},"modified":"2020-10-19T07:06:34","modified_gmt":"2020-10-19T07:06:34","slug":"molten-metal-foam-filter","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/molten-metal-foam-filter\/","title":{"rendered":"Filtre \u00e0 mousse pour m\u00e9tal en fusion"},"content":{"rendered":"

Le filtre \u00e0 mousse pour m\u00e9tal en fusion permet d'\u00e9liminer les impuret\u00e9s non m\u00e9talliques lors du processus de moulage des m\u00e9taux.<\/p>\n

La pr\u00e9sence d'impuret\u00e9s non m\u00e9talliques qui p\u00e9n\u00e8trent dans la masse fondue tout au long du processus de fusion et de coul\u00e9e du m\u00e9tal liquide nuit \u00e0 la qualit\u00e9 du m\u00e9tal fondu. Ce ph\u00e9nom\u00e8ne est bien connu des sid\u00e9rurgistes, des fondeurs et des m\u00e9tallurgistes.<\/p>\n

Dans leur grande majorit\u00e9, les inclusions non m\u00e9talliques sont des oxydes r\u00e9fractaires dont le point de fusion d\u00e9passe la temp\u00e9rature de fusion de l'acier. Il s'agit principalement d'oxydes de magn\u00e9sium, de calcium, d'aluminium et de silicium, qui font partie des scories et du mat\u00e9riau de rev\u00eatement. Une part importante des inclusions non m\u00e9talliques se forme dans la masse fondue \u00e0 la suite de la d\u00e9soxydation de l'acier. La solubilit\u00e9 des oxydes dans le fer pur est n\u00e9gligeable, voire inexistante.<\/p>\n

Les inclusions non m\u00e9talliques se pr\u00e9sentent le plus souvent sous forme de particules solides et compactes. Les films d\u2019oxyde pr\u00e9sents dans la masse fondue sont \u00e0 l\u2019\u00e9tat liquide, mais leur viscosit\u00e9 est nettement sup\u00e9rieure \u00e0 celle du m\u00e9tal en fusion. La teneur en ces impuret\u00e9s peut \u00eatre consid\u00e9rablement r\u00e9duite. Pour ce faire, toute une s\u00e9rie de mesures peut \u00eatre mise en \u0153uvre, notamment une s\u00e9paration des scories de haute qualit\u00e9, la r\u00e9duction de l'\u00e9rosion du rev\u00eatement des unit\u00e9s de fabrication d'acier, des cuves d'acier, des poches de coul\u00e9e et des poches interm\u00e9diaires, le soufflage du bain de fusion avec des gaz inertes, ainsi que la filtration des m\u00e9taux \u00e0 l'aide de diverses options et m\u00e9thodes de filtration.<\/p>\n

\u00c9tant donn\u00e9 que la taille des inclusions non m\u00e9talliques varie consid\u00e9rablement \u2013 allant de quelques fractions de micron \u00e0 plusieurs dizaines de millim\u00e8tres \u2013, le degr\u00e9 de purification du m\u00e9tal et, par cons\u00e9quent, sa qualit\u00e9 d\u00e9pendent des m\u00e9thodes de purification utilis\u00e9es lors de sa production.<\/p>\n

Les oxydes et les bulles de gaz, dont la densit\u00e9 est plusieurs fois inf\u00e9rieure \u00e0 celle de la fonte liquide, peuvent, dans certaines conditions d\u00e9crites par des lois physiques bien connues, remonter enti\u00e8rement \u00e0 la surface du bain de fusion. Cependant, il est pratiquement impossible que ces conditions soient r\u00e9unies. En particulier, avec l'augmentation du temps de s\u00e9jour du m\u00e9tal en fusion dans les unit\u00e9s de fabrication de l'acier et la diminution de sa viscosit\u00e9, l'usure du rev\u00eatement s'accentue et il se produit une saturation secondaire du m\u00e9tal liquide par des inclusions non m\u00e9talliques. Un traitement intensif du bain de fusion \u00e0 l\u2019aide d\u2019un gaz inerte permet d\u2019\u00e9liminer au maximum 15% d\u2019inclusions non m\u00e9talliques, tandis que la plupart des particules de taille inf\u00e9rieure \u00e0 50 microns restent dans le m\u00e9tal liquide.<\/p>\n

Nous aimerions nous attarder sur la m\u00e9thode la plus d\u00e9licate consistant \u00e0 purification des m\u00e9taux<\/a>, lorsque la saturation de la masse fondue en impuret\u00e9s non m\u00e9talliques est in\u00e9vitable. Cette m\u00e9thode consiste \u00e0 filtrer le m\u00e9tal \u00e0 l'aide d'un filtre \u00e0 mousse pour m\u00e9tal fondu et permet d'\u00e9liminer la quasi-totalit\u00e9 des inclusions non m\u00e9talliques et des bulles de gaz pr\u00e9sentes.<\/p>\n

\"Filtre<\/p>\n

Les filtres sont constitu\u00e9s d'une mousse c\u00e9ramique en vrac, fabriqu\u00e9e \u00e0 partir de mat\u00e9riaux hautement r\u00e9fractaires, pr\u00e9sentant un nombre donn\u00e9 de pores et une surface sp\u00e9cifique.<\/p>\n

Le m\u00e9canisme de nettoyage de la masse fondue \u00e0 l'aide de filtres en mousse c\u00e9ramique est assez complexe et mal compris ; n\u00e9anmoins, l'efficacit\u00e9 de ce proc\u00e9d\u00e9 de nettoyage peut \u00eatre qualifi\u00e9e d'unique. Cela est confirm\u00e9 par les ouvriers de fonderie qui parviennent \u00e0 utiliser des mat\u00e9riaux similaires de fabrication \u00e9trang\u00e8re pour produire des pi\u00e8ces moul\u00e9es de haute qualit\u00e9.<\/p>\n

En fonction du filtre \u00e0 mousse pour m\u00e9tal en fusion et de sa configuration, il est possible de proc\u00e9der \u00e0 un d\u00e9gazage \u00e0 la fois complet et s\u00e9lectif de la masse fondue. Lorsqu\u2019un m\u00e9tal contamin\u00e9 traverse un filtre, un champ \u00e9lectromagn\u00e9tique (EMF) est induit \u00e0 l\u2019int\u00e9rieur de la base en c\u00e9ramique ; celui-ci peut \u00eatre contr\u00f4l\u00e9 par la phase et la composition chimique, ainsi que par la surface sp\u00e9cifique de la c\u00e9ramique et le d\u00e9bit du m\u00e9tal. Lorsqu\u2019il traverse un filtre en c\u00e9ramique, le flux de m\u00e9tal liquide, en plus d\u2019\u00eatre purifi\u00e9, est davantage homog\u00e9n\u00e9is\u00e9. Cela influe bien s\u00fbr sur la qualit\u00e9 de la pi\u00e8ce moul\u00e9e.<\/p>\n

L'exp\u00e9rience acquise \u00e0 l'\u00e9chelle mondiale en mati\u00e8re d'utilisation de filtres en mousse c\u00e9ramique pour le nettoyage des m\u00e9taux \u00e0 bas point de fusion, ainsi que pour la filtration de l'acier par moulage de pr\u00e9cision selon la technique du moulage \u00e0 cire perdue, associ\u00e9e \u00e0 des am\u00e9liorations structurelles appropri\u00e9es, vous permettra de nettoyer des volumes de m\u00e9tal liquide bien plus importants.<\/p>\n

\u00c0 mesure que les filtres s'encrassent \u00e0 un niveau donn\u00e9, le m\u00e9tal remonte vers le niveau suivant de filtres, qui peut pr\u00e9senter une structure et un nombre de trous diff\u00e9rents. Le niveau sup\u00e9rieur des orifices de la cloison ne comporte pas de filtres. Ainsi, lors de la coul\u00e9e du m\u00e9tal en fonction de son niveau, il est possible de contr\u00f4ler la qualit\u00e9 des lingots en termes de teneur en inclusions non m\u00e9talliques. Il est possible d\u2019installer des filtres \u201c grossiers \u201d et \u201c fins \u201d dans les ouvertures de la cloison.<\/p>\n

Actuellement, en collaboration avec plusieurs entreprises m\u00e9tallurgiques, des travaux pr\u00e9paratoires sont men\u00e9s afin de tester cette m\u00e9thode de purification du m\u00e9tal liquide des inclusions non m\u00e9talliques et d'\u00e9valuer les compositions et les param\u00e8tres des filtres c\u00e9ramiques.<\/p>","protected":false},"excerpt":{"rendered":"

Molten Metal Foam Filter can filter out the non-metallic impurities in metal casting process. The presence of non-metallic impurities that enter the melt during the…<\/p>","protected":false},"author":1,"featured_media":5780,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39,138],"tags":[1719],"class_list":["post-3048","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-foundry-ceramic-filters","category-seo","tag-molten-metal-foam-filter"],"yoast_head":"\nMolten Metal Foam Filter,Ceramic Foam Filter Manufacturer<\/title>\n<meta name=\"description\" content=\"Molten Metal Foam Filter can filter out the non-metallic impurities in metal casting process. 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