表面修饰SiO_2纳米微粒对锂基脂抗磨性能影响的研究

Effect of SiO_2 Nanoparticles as Additive on Antiwear and Extreme Pressure Properties of Lithium Grease

合成了表面修饰S iO2纳米微粒,利用四球摩擦磨损试验机考察了S iO2纳米微粒作为锂基脂添加剂的摩擦磨损行为,用扫描电子显微镜、能量色散谱仪和X射线光电子能谱仪对钢球磨损表面进行了分析.结果表明:S iO2纳米微粒作为锂基脂添加剂具有良好的抗磨损性能,能够显著提高锂基脂的失效载荷.这是由于在摩擦过程中,S iO2纳米微粒富集在磨损表面并形成边界润滑膜,对磨损表面起到修复作用,从而使得锂基脂的抗磨和承载能力明显提高.

Surface modified SiO2 nanoparticles were synthesized. A four-ball machine was used to investigate the tribological behavior of SiO2 nanoparticles as additive in lithium grease. The worn surfaces of steel balls were analyzed by means of scanning electron microscopy （SEM）, energy dispersion spectroscopy （EDS） and X-ray photoelectron spectroscopy （XPS）. Analytical results indicate that SiO2 nanoparticles as additive can increase antiwear ability and load-carrying capacity of lithium grease. The reason is that SiO2 nanoparticles can deposited in boundary film play the role of self-replentish in the worn surface.