Microstructures and properties of coating from cemented carbide by vacuum powder sintering

摘要

In this paper, the microstructures and properties of coating from cemented carbide of WC-Fe-Co-Ni on the substrate 45 steel are studied. The effects of sintering temperature on the microstructures of coating, the interface structures between coating and the substrate, the microhardness distribution and its wear resistance in the coating are investigated. The results indicate that the coating is strongly metallurgical bonded with the substrate by the mutual diffusion and penetration of Fe towards the coating and W, Co, Ni towards the substrate at sintering temperature ranging from 1280 deg C to 1300 deg C. The coating obtained exhibits compact structure and uniformly distribution of WC with fine grain and porosity free from defects, having high microhardness and preferable wear resistance.