Carbide compositions for wear-resistant facings and method of fabrication
OwnerErwin Rudyinventor
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Abstract
Refractory, hard carbide alloys, intended primarily as replacement for the cast eutectic WC + W.sub.2 C tungsten carbides currently used as hard components in wear-resistant facings, consist of fine-grained and hard two-phase mixtures of subcarbide, (Mo,W).sub.2 C, and hexagonal monocarbide (Mo,W)C, solid solutions, and are formed by solid state decomposition of the pseudocubic, .eta.-(Mo,W).sub.3 C.sub.2, or cubic .alpha.-(Mo,W)C.sub.1-x solid solutions. The carbide alloys of the invention can be combined with low-melting metal binders to form cemented carbide alloys of at least equivalent wear-resistance to alloys using the eutectic tungsten carbides.
Claims6
A metal carbide composition (Mo.sub.x W.sub. x' Cr.sub. x")C.sub.z, in which the relative mole fractions x, x', x" (x + X' + x" = 1) of the metal components assume values of at least 0.20 for x, between 0 and 0.80 for x', and between 0 and 0.18 for x" when x is less than about 0.80 and is 0 when x is greater than about 0.80, and the value of the stoichiometry parameter z, which stands for the number of gramatoms carbon present per gramatom of the metal component in the carbide alloy, lies between 0.60 and 0.73, said metal carbide composition being a two-phase mixture consisting of metal subcarbide, M.sub.2 C and hexagonal monocarbide, MC, solid solution, wherein M represents the metal component, the average spacing between the grains of said subcarbide and said monocarbide phases in the mixture being less than 4 microns, and said two-phased mixture being formed by solid state decomposition of the pseudocubic .eta. -M.sub.3 C.sub.2, or cubic .alpha. -MC.sub.1-x, high temperature carbide solid solutions.
Dependencies are inferred from the claim text.