Mo含量对镍基合金力学及摩擦学性能的影响

摘要

利用粉末冶金的方法制备不同Mo含量的镍基合金.考察其室温至1000℃的力学性能及室温至900℃下的摩擦磨损性能,分析磨损表面形貌,阐明Mo含量对Ni基合金力学和摩擦学性能的影响及其机理,优化Mo元素的含量.结果表明:Mo含量(质量分数)为5%时可以改善镍基合金的拉伸、压缩等力学性能和摩擦学性能;XRD、SEM及Raman分析表明在500℃以上时,磨痕表面形成由NiO、NiMoO4等组成的摩擦层,有效地改善了Ni基合金在高温下的摩擦学性能.%Ni-based alloys with different Mo contents were prepared by the powder metallurgy. The mechanical properties from RT to 1000 ℃ and the tribological properties from RT to 900 ℃ were investigated, and the wear surfaces morphologies were analyzed. The effect of Mo content on the mechanical and tribological properties and the mechanism were elucidated. The results show that the mechanical properties and tribological properties of Ni-based alloy can be improved when the molybdenum content is 5%. The worn surfaces examined by XRD, SEM and Raman indicate that the tribo-layers consist of NiO and NiMoO4 at temperature above 500 ℃, which is responsible for the reduced friction coefficient and wear rate of Ni-based alloy at high temperatures.