WC-CONTAINING CEMENTED CARBIDE REINFORCED BY DISPERSION IN GRAIN AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To obtain a WC-contg. cemented carbide excellent in deflective strength, hardness and fracture toughness by specifying a compsn. consisting of a bonding phase based on an iron family metal, a phase of a cubic compd. such as carbide of a group IVa, Va or VIa metal and WC contg. a material dispersed in grains. ;SOLUTION: The WC-contg. cemented carbide consists of 3-30 vol.% bonding phase based on an iron family metal, ≤60 vol.% phase of a cubic compd. such as carbide, carbonitride, oxycarbide or oxycarbonitride of a group IVa, Va or VIa metal and the balance WC with inevitable impurities. The WC contains ≥20% WC reinforced by dispersing a heterogeneous inorg. material in the grains. The dispersed inorg. material is preferably one or more cubic compds. or iron family metals, the average particle diameter is ≤1.0 μm and the pref. content is ≥0.01%. The reinforced WC is platy crystals and the average grain diameter is preferably 3-300 times the average particle diameter of the dispersed inorg. material. The cemented carbide has improved various characteristics.;COPYRIGHT: (C)1999,JPO