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

摘要: 采用激光熔覆工艺在316L基板上制备了3种316L+Al₂O₃纳米陶瓷复合涂层,纳米Al₂O₃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%Al₂O₃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。

Abstract: A 316L+ Al₂O₃ nano ceramic composite coating with 2%, 5% and 8% nano-Al₂O₃ ceramic 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% Al₂O₃ has 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 5.95 μm with a maximum microhardness of 718.6 HV. The friction coefficient and wear loss mass are 0.69 and 4.26 mg, respectively.