含纳米SiO2锂基润滑脂流变学与摩擦学性能

利用SG65三辊研磨机制备了含不同粒径和不同质量浓度SiO₂纳米颗粒的锂基润滑脂. 通过MRS-1J机械式四球长时抗磨损试验机及安东帕MCR301流变仪研究了SiO₂纳米颗粒作润滑脂添加剂的摩擦学性能和流变学性能. 结果表明，SiO₂纳米颗粒粒径为30 nm、质量浓度为4%时润滑脂摩擦学系数最小，抗磨减摩性能最好. 在中低剪切速率下对流变试验数据进行拟合，提出了含纳米颗粒质量浓度参数的润滑脂改进型流变模型. SiO₂纳米添加剂可改善锂基润滑脂触变性，提高润滑脂抗剪切能力和热稳定性能.

Rheological and Tribological Properties of Lithium Grease Containing Nano Silica

In the article, Lithium greases with different particle sizes and mass concentrations of SiO2 nanoparticles was fabricated via SG65 three-roll grinder. The tribological properties and rheological prop-erties of different particle sizes and mass concentrations SiO2 nanoparticales as additives in lithium base greases was investigated via MRS-1J four-ball friction tester and Anton Paar MCR301 rheometer. It is shown that the friction coefficient of grease is lowest and anti-wear performance is best when SiO2 nanop-articles size is 30 nm and the mass concentration is 4%. Under low and moderate shear rate, the rheolog-ical experimental data was fitted and a new grease rheological model was proposed, containing nanoparti-cals mass concentrations parameter. SiO2 nanoparticles as additives can improve the thixotropic properties of lithium grease, enhance the anti-shear ability and thermostability of greases.