Ni/W/C粉等离子原位冶金生成粗晶碳化钨复合材料的性能

Property of Composite with Coarse Grain WC Prepared by Plasma In-situ Metallurgy of Ni/W/C Powder

以Ni/W/C为粉末原料用等离子原位冶金法制备了大颗粒WC合金球钉增强Q345耐磨钢板,用扫描电镜(SEM)、电子探针(EMPA)、X射线衍射仪(XRD)、显微硬度计等对球钉的组织成分、物相组成以及显微硬度进行表征,研究了这种大颗粒碳化钨复合材料的性能。结果表明:对于不同的粉末比例,40%Ni含量的球钉表面成型光亮、致密,与基体板的结合力强,内部的WC大颗粒分布均匀,其平均尺寸约为80μm,最大尺寸约为100μm,基体相为(Fe,Ni),还有网格状的Ni17W3和(Fe,Ni)共晶组织。球钉的平均显微硬度为1183.517HV0.1,大颗粒WC的显微硬度最大值为2078HV0.1。

Ball-studs with coarse grained WC were prepared on Q345 steel plateby in-situ plasma metallurgy method with powder mixtures of Ni/W/C as raw material on. The microstructure, composition, phase constituent and microhardness of the ball-studs were characterized by means of SEM, EMPA, XRD and microhardness tester. The results show that among others, the powder mixture with 40% Ni could produce the most desirable ball-studs with brighter surface, higher compactness and stronger adhesive to the substrate; coarse granules of WC with an average size ca 80μm evenly distributed in the inner portion of the ball-stud matrix of （Fe,Ni）; meanwhile, the network-pattern eutectic structure of Ni17W3 and （Fe, Ni） can be detected. The average microhardness of ball-stud is 1183.517HV0.1, while the microhard- ness of the coarse grain of WC is 2078HV0.1.