金属基纳米陶瓷复合涂层的制备及优化研究

Research on Preparation and Optimization of Metal-based Nano-ceramic Composite Coatings

采用激光熔覆工艺在316L基板上制备了3种316L+AlO纳米陶瓷复合涂层,纳米AlO陶瓷颗粒的质量分数分别为2%、5%和8%。通过光学显微镜(OM)、X射线衍射仪(XRD)分析复合涂层的微观组织和物相组成。随后根据涂层的硬度分布和耐磨性,分析纳米陶瓷复合涂层的力学性能和增强机理。结果表明:添加有5%AlO的涂层组织和性能比2%和8%的优异,且熔覆层组织均匀,没有气孔和裂纹等缺陷的生成,顶部等轴晶区平均晶粒尺寸达5.95μm,显微硬度达718.6 HV,且摩擦系数和磨损损失质量分别为0.69、4.26 mg。

A 316L+AlOnano ceramic composite coating with 2%,5%and 8%nano-AlOceramic particles were prepared by laser cladding on 316L substrate,and the microstructure and phase of the coating were analyzed by optical microscope(OM)and X-ray diffractometer(XRD).Based on the microhardness and wear resistance,the mechanical properties and enhancement mechanism were analyzed.The results show that the coating with 5%AlOhas the best microstructure and performance than that of the coating with 2%and 8%,and the cladding layer has a dense structure without pores and cracks.The average grain size of the top equiaxed grain area is 5.95μm with a maximum microhardness of 718.6 HV.The friction coefficient and wear loss mass are 0.69 and 4.26 mg,respectively.