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以WC、SiC和Ni60A粉为原料,采用氩弧熔覆技术在Q345钢基体表面制备出WC+γ-Ni5Si2增强Ni基复合涂层。利用扫描电镜(SEM)、X射线衍射仪(XRD)、显微硬度计和滑动磨损试验机对复合涂层的显微组织、相构成、硬度及耐磨性进行了研究。结果表明:熔覆层相构成为WC、γ-Ni5Si2和γ-Ni,WC以颗粒状析出,由于氩弧熔覆时加热温度高,导致SiC分解,使Si与Ni在高温下形成了γ-Ni5Si2;熔覆层与基体呈冶金结合,无裂纹、气孔等缺陷;涂层最高硬度可达1200 HV0.2,是基体金属的4倍以上;在室温干滑动磨损试验条件下具有优异的耐磨损性能,耐磨性比基体提高了11倍。
The WC + γ-Ni5Si2 reinforced Ni-based composite coating was prepared on the surface of Q345 steel by using WC, SiC and Ni60A powders as raw materials. The microstructure, phase composition, hardness and wear resistance of the composite coatings were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), microhardness tester and sliding wear tester. The results show that WC, γ-Ni5Si2 and γ-Ni are precipitated in the cladding layer. WC precipitates in the form of particles. Due to the high heating temperature during argon arc cladding, the SiC is decomposed and Si and Ni form γ- Ni5Si2; cladding layer and the substrate was metallurgical bonding, no cracks, porosity and other defects; the highest hardness of the coating up 1200 HV0.2, is more than 4 times the base metal; under dry sliding wear test conditions at room temperature with excellent wear resistance Damage performance, wear resistance than the substrate increased by 11 times.