Process for the production of hard metal grade powder

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 1/05 (2006.01) B22F 1/00 (2006.01) B22F 9/02 (2006.01) B22F 9/04 (2006.01) C22C 1/10 (2006.01)

Patent

CA 2409394

The invention relates to a process for the production of a hard metal grade powder consisting of hard material, metal binder and non-water-soluble pressing aid components involving drying of a slurry containing the components using pure water as a liquid phase. The essential characteristic of the invention is that the hard material and metal binder components are first milled in water, forming a slurry, and that the pressing aid components are added to the slurry in the form of an emulsion after milling. The emulsion is produced with the aid of an emulgator with the addition of water.

L'invention concerne un procédé permettant de produire un élément saillant en métal dur, à base de parts d'urée, de parts de métal liant et de parts d'auxiliaires de compression solubles dans l'eau, par séchage de boues humides contenant ces constituants, avec de l'eau pure comme phase liquide. Selon l'invention, les parts d'urée et de métal liant sont d'abord moulues avec de l'eau de manière à former des boues humides. Après mouture, les auxiliaires de compression sont ajoutés sous forme d'émulsion aux boues humides. L'émulsion est obtenue à cet effet, à l'aide d'un émulsifiant, par adjonction d'eau.

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