兰州理工大学学报 ›› 2024, Vol. 50 ›› Issue (6): 1-10.

• 材料科学与工程 •    下一篇

Ni-Mo-Y-CaF2高温自润滑复合材料的制备与摩擦学性能

苏霄鹏1, 金伟文*2, 杨贵荣1, 陆龙2, 王静波3   

  1. 1.兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室, 甘肃 兰州 730050;
    2.兰州工业研究院, 甘肃 兰州 730050;
    3.中国科学院兰州化学物理研究所 固体润滑国家重点实验室, 甘肃 兰州 730000
  • 收稿日期:2023-10-07 出版日期:2024-12-28 发布日期:2025-01-13
  • 通讯作者: 金伟文(1970-),男,浙江东阳人,工程师.Email:66962226@qq.com
  • 基金资助:
    兰州市科技计划项目(2019-1-17)

Preparation and tribological properties of Ni-Mo-Y-CaF2 high temperature self-lubricating composites

SU Xiao-peng1, JIN Wei-wen2, YANG Gui-rong1, LU Long2, WANG Jing-bo3   

  1. 1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou Univ. of Tech., Lanzhou 730050, China;
    2. Lanzhou Institute of Industry Research, Lanzhou 730050, China;
    3. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2023-10-07 Online:2024-12-28 Published:2025-01-13

摘要: 采用放电等离子烧结(SPS)技术制备了不同CaF2添加量的Ni-Mo-Y-CaF2高温自润滑复合材料,研究了CaF2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-CaF2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CaF2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-10CaF2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.

关键词: Ni-Mo-Y-CaF2复合材料, 微观组织, 力学性能, 高温摩擦学性能

Abstract: Ni-Mo-Y-CaF2 high temperature self-lubricating composites with different CaF2 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-CaF2 composites is uniform and dense, and the density, hardness and yield strength of the composites decrease with the amount of CaF2 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-10CaF2 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.

Key words: Ni-Mo-Y-CaF2 composites, microstructure, mechanical property, high temperature tribological properties

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