Improved fine powders and method for manufacturing

B - Operations – Transporting – 22 – F

Patent

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B22F 1/02 (2006.01) B01J 2/00 (2006.01) B22F 9/30 (2006.01) C23C 16/06 (2006.01) C23C 16/16 (2006.01) C23C 16/44 (2006.01) C23C 16/442 (2006.01) C23C 16/54 (2006.01)

Patent

CA 2247210

The invention relates to the encapsulation of Geldart class C substrate powders with a coating of metal, binder, or sintering aid. Encapsulation is achieved using chemical vapor deposition techniques in a recirculating fast-fluidized or turbulent fluidization flow bed reactor (10). Thin, smooth, generally uniform, fully encapsulating coatings are produced on the fine substrate particles. The coated Geldart class C particles, and products made therefrom, exhibit excellent improved physical properties.

L'invention se rapporte à l'enrobage de poudres composées de particules de classe C de Geldhart avec une matière métallique, un liant ou un auxiliaire de frittage. On effectue cet enrobage en mettant en oeuvre des procédés de dépôt chimique en phase vapeur dans un réacteur à lit fluidisé rapide à recirculation de particules ou dans un réacteur à lit fluide obtenu par fluidisation turbulente. On peut ainsi former des revêtements fins, lisses et généralement uniformes enrobant parfaitement les fines particules de matière. Les particules de classe C de Geldhart enrobées, ainsi que les produits que l'on fabrique à partir de ces particules, présentent des caractéristiques physiques perfectionnées excellentes.

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