A hard-metal body

Details A hard-metal body A hard-metal body

B - Operations, Transporting

22

F

B22F 7/00 (2006.01) B23B 27/14 (2006.01) C22C 1/05 (2006.01) C22C 29/08 (2006.01)

Patent

CA 2748867

The invention relates to hard-metal body comprising a hard-metal, the hard-metal comprising tungsten carbide grains and metal binder comprising cobalt having a concentration of tungsten dissolved therein, the body comprising a surface region adjacent a surface and a core region remote from the surface, the surface region and the core region being contiguous with each other; the mean binder fraction of the core region being greater than that of the surface region; the mean carbon concentration within the binder being higher in the surface region than in the core region; to tools comprising same and methods of making same.

L'invention concerne un corps en métal dur qui comporte un métal dur, le métal dur comportant des grains de carbure de tungstène et un liant métallique comportant du cobalt qui présente une concentration de tungstène dissoute, le corps comportant une région de surface adjacente à une surface et à une région centrale éloignée de la surface, la région de surface et la région centrale étant contiguës; la fraction moyenne de liant de la région centrale étant supérieure à celle de la région de surface; la concentration moyenne de carbone dans ledit liant étant plus élevée dans la région de surface que dans la région centrale. L'invention porte également sur des outils comportant le corps en métal dur et sur des procédés de fabrication associés.

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