高温摩擦学特性的影响
(1.南京理工大学 材料科学与工程系,南京 210094;
2.中国矿业大学 机电与材料工程学院,徐州 221008)
摘 要: 用粉末冶金热压方法制备了含不同LaF3添加量的Ni-Cr-Mo-Al-TiB-MoS2-LaF3系宽温度范围自润滑合金,测试了合金力学性能及与Al2O3陶瓷配副下的高温摩擦磨损性能。研究结果表明,合金的力学性能随LaF3添加量的增加而降低,但其减摩耐磨能力随LaF3添加量的增加而提高。合金中的硫化物(CrxSy,Mo2S3和AlLaS3)是合金低温范围内(室温至300℃)自润滑的主要因素;高温摩擦时(400~700℃)合金表面氧化物和残余硫、镧的化合物及对偶表面转移膜中氧化物与复合氧化物的协同作用是摩擦因数进一步降低的原因。
关键字: 镍基自润滑合金;氟化镧;摩擦学性能
high-temperature tribological
properties of Ni-based
self-lubricating alloy
(1.Department of Materials Science and Engineering,
Nanjing University of Science Technology,
Nanjing 210094,China;
2.School of Mechatronic and Material Engineering,
China University of Mining and Technology,
Xuzhou 221008,China)
Abstract:The Ni-based self-lubricating alloys with various proportions of LaF3 as lubricant were prepared by hot-pressing the mixture powder of alloyed Ni-Cr powder,elemental Mo,Al,Ti,B,and MoS2 powder and LaF3 powder. The mechanical properties and tribological properties of these alloys rubbing with Al2O3 ceramics were measured at elevated temperature.The results show that the mechanical properties of alloys decrease with increasing LaF3 addition, and the ability of anti-friction and wear resistance of alloys increases with increasing LaF3 addition,especially at high temperature. At temperature below 300℃,the sulfides(Crx Sy,Mo2S3,and AlLaS3)in alloys play the main role of lubrication in the friction process.At high temperature,the synergistic effect of oxides and sulfides lead to further reduction of the friction coefficient.
Key words: Ni-based self-lubricating alloy;LaF3; tribological properties