PLANAR CRYSTAL TUNGSTEN CARBIDE-CONTAINING POWDER AND PRODUCING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To produce a raw material optimum for producing a hard sintered material simultaneously improved in hardness and toughness by dispersing planar crystal tungsten carbide and to provide a method for producing the same. SOLUTION: A powdery mixture of iron-group metal, W and carbon or composed of mutual compound powders thereamong is subjected to heating treatment in a vacuum or in a nonoxidizing atmosphere in a state in which bulk density is low. The obtained planar crystal tungsten carbide is high in an aspect ratio and a content, so that the hardness and toughness of the sintered hard material using this can simultaneously be improved.