摘要
采用放电等离子烧结(SPS)技术制备了不同CaF_(2)添加量的Ni-Mo-Y-CaF_(2)高温自润滑复合材料,研究了CaF_(2)添加量对复合材料微观结构、力学性能及摩擦磨损性能的影响.结果表明:Ni-Mo-Y-CaF_(2)复合材料的组织均匀致密,复合材料的密度、硬度及屈服强度随CaF_(2)添加量的增加呈下降趋势.温度对复合材料的摩擦磨损性能有显著影响.在室温至800℃,复合材料的平均摩擦系数随温度的增加先降低,在400~600℃略微增加,随后再次降低;平均磨损率随着温度的增加先增加后又降低,400℃时平均磨损率最大.在室温时,Ni-Mo-Y-10CaF_(2)复合材料的平均磨损率最低,约为Ni-Mo-Y合金的1/5;在800℃时,复合材料的磨损率均低于Ni-Mo-Y合金,磨损表面形成致密光滑的润滑膜,润滑膜主要由钼酸钙、钼酸镍及镍和钼的氧化物组成.
Ni-Mo-Y-CaF_(2)high temperature self-lubricating composites with different CaF_(2)addition amounts were prepared using spark plasma sintering(SPS)technology.The microstructure,mechanical properties,friction and wear properties of the composites were studied.The results showed that the microstructure of Ni-Mo-Y-CaF_(2)composites is uniform and dense,and the density,hardness and yield strength of the composites decrease with the amount of CaF 2 added increasing.Temperature significantly affects the friction and wear properties of the composites.From room temperature to 800℃,the average friction coefficient of the composites decreases initially with increasing temperature,slightly increases between 400℃and 600℃,and then decreases again.The average wear rate increases initially with increasing temperature,and then decreases reaching a maximum at 400℃.At room temperature,the average wear rate of Ni-Mo-Y-10CaF_(2)composite has the lowest average wear rate,about 1/5 of that of Ni-Mo-Y alloy.At 800℃,the wear rates of the composites are lower than that of the Ni-Mo-Y alloy.A dense and smooth lubricating film forms on the wear surface,mainly composed of calcium molybdate,nickel molybdate,and the oxides of nickel and molybdenum.
作者
苏霄鹏
金伟文
杨贵荣
陆龙
王静波
SU Xiao-peng;JIN Wei-wen;YANG Gui-rong;LU Long;WANG Jing-bo(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou Univ.of Tech.,Lanzhou 730050,China;Lanzhou Institute of Industry Research,Lanzhou 730050,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China)
出处
《兰州理工大学学报》
CAS
北大核心
2024年第6期1-10,共10页
Journal of Lanzhou University of Technology
基金
兰州市科技计划项目(2019-1-17)。