摘要
Ti/TiN/Zr/ZrN multilayer coatings were deposited on Cr_17Ni_2 steel substrates with different surface roughnesses by vacuum cathodic arc deposition method. Microstructure, micro-hardness, adhesion strength and cross-sectional morphology of the obtained multilayer coatings were investigated. The results show that the Vickers hardness of Ti/TiN/Zr/ZrN multilayer coating, with a film thickness of 11.37 μm, is 29.36 GPa. The erosion and salt spray resistance performance of Cr_17Ni_2 steel substrates can be evidently improved by Ti/TiN/Zr/ZrN multilayer coating. The surface roughness of Cr_17Ni_2 steel substrates plays an important role in determining the mechanical and erosion performances of Ti/TiN/Zr/ZrN multilayer coatings. Overall, a low value of the surface roughness of substrates corresponds to an improved performance of erosion and salt spray resistance of multilayer coatings. The optimized performance of Ti/TiN/Zr/ZrN multilayer coatings can be achieved provided that the surface roughness of Cr_17Ni_2 steel substrates is lower than 0.4μm.
采用真空阴极电弧沉积技术,在4组表面粗糙度不同的Cr17Ni2钢基体上制备Ti/Ti N/Zr/Zr N多层膜。采用扫描电镜、X射线衍射仪、显微硬度计、结合力划痕仪、砂粒冲刷试验仪和盐雾试验机分析测试多层膜的截面形貌、膜层厚度、相组成、硬度、膜/基结合力、抗砂粒冲刷性能和耐腐蚀性能等。结果表明:所制备的多层膜厚度为11.37μm,维氏硬度为29.36 GPa;多层膜能显著地提高Cr17Ni2钢基体的抗砂粒冲刷和耐盐雾腐蚀能力;基体材料表面粗糙度对膜层性能的影响很大,基体表面粗糙度越小,其膜/基结合力、抗砂粒冲刷性能和耐盐雾腐蚀性能越佳;为了获得具有良好综合性能的膜层,待表面处理的基体表面粗糙度必须控制在Ra<0.40μm。
基金
Project(2011B050400007)supported by the International Cooperation Program of Guangdong Province,China
