Patent ID: 9297054
Filing Date: 2016-03-29
CPC Classification: B22F,C22C,Y10T

Claim Text:
1. A cemented tungsten carbide article comprising a core of metal carbide grains and a binder selected from cobalt (Co), nickel (Ni) and iron (Fe), and a surface layer defining an outer surface for the article, the surface layer comprising 5 to 25 weight percent of tungsten (W) and 0.1 to 5 weight percent carbon (C), the balance of the surface layer comprising a metal or alloy selected from the binder metals and alloys; in which the surface layer is substantially free of carbide grains as determined by optical microscopy or scanning electron microscopy (SEM), has a thickness of at least 1 micron and at most 50 microns and includes cobalt (Co), iron (Fe) or nickel (Ni).