Lozenge Grain Tungsten Carbide and Its Preparation Method

The present invention describes a lozenge grain tungsten carbide. Which comprises: 4-40% (by volume) of at least one selected from the group comprising Co, Ni and Fe as an iron group metal phase and the hard phase, and unavoidable impurities, the balance of a binder main component. Characterized in that:

1) Contains only a hard phase of tungsten carbide, or tungsten carbide not more than 50% (by volume) containing compound having a cubic structure, the cubic structure of the compound is selected from the periodic table, niobium and tungsten of Group 6b of the elements carbides and nitrides, the solid solution thereof and at least one body, the X-ray target Ka ray diffraction analysis (001) crystal plane and the peak intensity of (101) crystal plane are represented by h (001) and h (101 when) the tungsten carbide satisfy h (001) / h (101) ≥0.50.

2) Tungsten carbide contains not less than 20% (by volume) of carbide platelets (based on the total of tungsten carbide), not lower than the maximum length and the minimum length of such platelets in the tungsten carbide section to 3.0.


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