摘要
利用SG65三辊研磨机制备了含不同粒径和不同质量浓度SiO_2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SiO_2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,SiO_2纳米颗粒粒径为30nm、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.SiO_2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.
In the article,Lithium greases with different particle sizes and mass concentrations of SiO_2 nanoparticles was fabricated via SG65 three-roll grinder. The tribological properties and rheological properties of different particle sizes and mass concentrations SiO_2 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 SiO_2 nanoparticles size is 30 nm and the mass concentration is 4%. Under low and moderate shear rate,the rheological experimental data was fitted and a new grease rheological model was proposed,containing nanoparticals mass concentrations parameter. SiO_2 nanoparticles as additives can improve the thixotropic properties of lithium grease,enhance the anti-shear ability and thermostability of greases.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2016年第4期71-76,共6页
Journal of Beijing University of Posts and Telecommunications
基金
山东省自然科学基金项目(ZR2011EEM008)
关键词
纳米SIO2
锂基润滑脂
摩擦学性能
流变性能
nano-silica
lithium grease
tribological properties
rheological properties
