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采用CO2激光器在Q235钢基体表面激光原位合成TiC/Ni复合涂层;借助于扫描电镜(SEM)、X射线衍射仪(XRD)、能谱仪(EDS)、显微硬度计、ML-100型磨粒磨损试验机对涂层组织结构、物相、组成成分、硬度及耐磨性能进行了分析。结果表明:在Q235表面激光熔覆(Ni+Ti+C)混合粉末原位制备出了TiC/Ni复合陶瓷涂层,涂层组织细密、无裂纹、气孔且与基体呈良好的冶金结合,TiC颗粒呈现块状和花瓣状组织;从表层到底部TiC颗粒数量逐渐减少;添加Ti和C的复合涂层较镍基激光熔覆层,其显微硬度和耐磨性能都得到了一定的提高。
In situ synthesis of TiC / Ni composite coating on the surface of Q235 steel substrate by CO2 laser was studied. The microstructure of the Q235 steel substrate was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectrometer Type abrasive wear tester for coating structure, phase, composition, hardness and wear resistance were analyzed. The results show that the TiC / Ni composite ceramic coating is prepared in-situ by laser cladding (Ni + Ti + C) mixed powder on Q235. The coating has fine microstructure, no cracks and pores and good metallurgical bond with the substrate. The particles showed massive and petal-like structure. The number of TiC particles decreased from the surface to the bottom. The microhardness and wear resistance of the composite coatings with Ti and C were better than those with Ni-based laser cladding.