In order to study the effect of graphene on the tribological and rheology properties of lithium based greases,lithium-based greases modified with different mass fraction of few-layer graphene were prepared by mechanical stirring,ultrasonic dispersion and three-roll grinding,and their tribological and rheological properties were investigated using an MR-10 four-ball tester and a DHR-2 rotational rheometer,respectively.The results show that the addition of few-layer graphene can effectively improve the anti-wear and friction reducing properties of lithium-based greases,and the best effect is achieved when the mass fraction of few-layer graphene is 0.1％.The addition of few-layer graphene significantly increases the strain value corresponding to the flow point of the lubricating grease,the energy required to break the lubrica-ting grease soap fibers,and the time needed for soap fiber structure recovery after damage.By regression analysis of the ex-perimental data,the flow equations of lithium-based grease with different mass fraction of few-layer graphene were estab-lished based on the Herschel-Bulkley model.
关键词
少层石墨烯/锂基润滑脂/摩擦学性能/流变性能/纳米材料
Key words
few-layer graphene/lithium-based grease/tribological properties/rheological properties/nano material
维普
万方数据