Mechanical Properties of WC-Co Cemented Carbide Prepared via Vacuum Sintering

摘要

WC-Co cemented carbide specimens were prepared via vacuum sintering. The influences of composition and sintering temperature on phase composition, microstructure and mechanical properties of WC-Co cemented carbide were investigated. The results show that dense specimens were obtained in the sintering temperature range of 1280～1400°C and the relative density reached over 95%. Only WC and Co_3W_3C (γ-phase) were detected by XRD without any else phases, even though Co. With the ascended sintering temperature, hardness increased and the transverse rupture strength (TRS) ascended to peak value and then descended. WC-Co cemented carbide with excellent mechanical properties (HRA>90, TRS～700 MPa and K_(IC)>10 MPa·m~(1/2)) were obtained.