Preparation and wear resistance of dual-scale structure cemented carbide spherical teeth

Abstract

Based on commercially available WC (particle sizes of 0.9 μm and 2.4 μm) and Co, a dual-scale structure WC-6Co cemented carbide was prepared via conventional roller ball milling and following vacuum sintering. Effect of ball milling process on the microstructure, densities and mechanical properties were investigated together with the toughening mechanism of the dual-scale structure. The results showed that the dual-scale structured cemented carbide has excellent comprehensive mechanical properties, and its transverse rupture strength, hardness and fracture toughness are 3077 MPa, 1570 HV30 and 10.6 MPa m1/2, respectively. The drilling spherical teeth was prepared by the optimized technology and subjected to impact wear test, the failure mechanism of cemented carbide spherical teeth in drilling operations is studied. The CM-2 spherical teeth had a more reasonable distribution structure of coarse and fine of WC, and exhibited more excellent impact wear resistance in the impact wear test of granite.