表面修饰SiO2纳米微粒对锂基脂抗磨性能影响的研究

Effect of SiO2 Nanoparticles as Additive on Antiwear and Extreme Pressure Properties of Lithium Grease

摘要: 合成了表面修饰SiO2纳米微粒,利用四球摩擦磨损试验机考察了SiO2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:SiO2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,SiO2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.

Abstract: Surface modified SiO_2 nanoparticles were synthesized. A four-ball machine was used to investigate the tribological behavior of SiO_2 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 SiO_2 nanoparticles as additive can increase antiwear ability and load-carrying capacity of lithium grease. The reason is that SiO_2 nanoparticles can deposited in boundary film play the role of self-replentish in the worn surface.