Pure WC/Mo Functionally Graded Materials

Abstract

Pure WC powders were sintered by spark plasma system (SPS). The hardness and toughness of the WC body were 24 GPa and 6 MPa.m 1/2 , respectively. Functionally graded materials (FGMs) were fabricated from WC and Mo powders using SPS by stacking layers consisting of a different ratio of WC and Mo powders. Two layers of a mixture of WC and Mo powders inserted between WC and Mo layers were sufficient to relax residual stress based on the thermal expansion mismatch of WC and Mo. At room temperature toughness of the WC layer was decreased along the periphery of disk samples near the edge but increased inside the sample.