含纳米金刚石微粒润滑剂抗接触疲劳性能的研究

STUDY ON CONTACT FATIGUE RESISTANCE OF LUBRICANT WITH NANO-DIAMOND PARTICLES

对含纳米金刚石微粒的二相流体润滑剂,进行了钢-钢配副的抗接触疲劳性能研究。结果表明,含纳米金刚石微粒的二相流体润滑剂与基础油(N15全损耗系统用油)相比可以提高接触疲劳寿命,并且随着纳米金刚石质量分数的增加提高的幅度增大,当纳米金刚石质量分数在0.3％时,接触疲劳寿命L10仅提高3.62倍,而当纳米金刚石质量分数增加到3.0％时,接触疲劳寿命L10提高了13.85倍。同时通过对添加剂的物理性质分析、摩擦学性能分析及对润滑剂的理化性能分析等,研究了纳米金刚石微粒的抗疲劳作用机理,即纳米金刚石微粒在表面的滚动和润滑剂粘度增加的作用。

The RCF performances of the steel-to-steel pairs lubricated by two-phase liquid lubricants with additives of nano-grade powders of diamond are studied. The experimental results show that compared with the base oil of N15, the two-phase lubricant with nano-diamond does increase the RCF life, and the more nano-diamond is used, the higher RCF life is increased. When the content of nano-diamond is 0.3% percentage by weight, L10 life is increased only 3.62 times, but when it is 3.0%, the times is 13.85. The anti-fatigue behaviour of nano-diamond particles in the lubricants is investigated by analyses of physical and tribological properties of and physical chemistry properties of lubricant, namely, rolling of nano-diamond particles on the surface and increasing viscosity of the lubricant.