稀土Ce的添加方式对WC-Co硬质合金性能的影响

Effect of Adding Method of Rare Earth Ce on Property of WC-Co Cemented Carbide

采用以共沉淀方法制备的Ni Ce复合粉末、真空蒸镀W的金刚石等为原料,热压活化烧结,制取了具有高强度、高硬度的稀土金刚石增强WC 10%Co 5%Ni硬质合金复合齿。观察稀土金刚石增强WC 10%Co 5%Ni硬质合金复合齿的显微结构,测试其硬度、密度、断裂强度、抗冲击性能、磨耗比。研究结果表明:采用热压活化烧结获得的稀土金刚石增强WC 10%Co 5%Ni硬质合金复合齿的洛氏硬度为90,断裂强度为1 918 MPa,抗冲击性能>200 J,磨耗比为30.21。采用中间合金Ni Ce的方式加入稀土Ce使稀土在合金中的分布更均匀。

WC-10%Co-5%Ni cemented carbide enhanced by rare-earth and diamond was prepared in a hot-pressing activated sintering process with Ni-Ce composite powder produced with coprecipitation technology and diamond plated W by vacuum vapor deposit. The microstructure of cemented carbide was observed, and the hardness, density, strength, toughness against impact and wear ratio were tested. The results show that hardness of WC-10%Co-5%Ni cemented carbide prepared in the hot-pressing activated sintering is 90, strength is 1918 MPa, toughness against impact is more than 200 J, and wear ratio is 30.21. Rare earth Ce can be made more homogeneous in the alloy by adding Ni-Ce powder produced with coprecipitation.