This study conducted a tribological investigation of base oil (PAO6 and 5W 40) and ionic liquids (IL)-modified lubricants through a four-ball tribometer for 30 min. The lubricants were fabricated via a two-step method using stirring magnetic and ultrasonic dispersion. IL, base oil, and lubricants were, respectively, characterized by XRD and FTIR analysis. In addition, multiple characterizations such as EDS, 3D morphology, and SEM were carried out to evaluate the wear and friction performance of steel balls. Ultimately, the results showed that the coefficient of friction (COF) and wear scar diameter (WSD) of wear scar lubricated by IL-modified lubricants were greatly decreased than that by base oil. IL can well improve the tribological properties of PAO 6 oil and 5W-40 oil due to the tribo-film appearance on the friction surface of wear scar by the effective role of IL. Fascinatingly, this investigation comprehensively and elaborately put a new sight into the lubrication mechanism of how IL reacted with a base oil and enhanced the tribological characteristics.
Yongjin Mai,Hongjie Ling,Fuxian Chen,Cansen Liu,Liuyan Zhang,Xiaohua Jie
A facile, low cost and green approach to fabricating graphene nanosheet coatings is reported. It is composed of spraying graphene oxide (GO) suspension to form GO nanosheet coatings followed by a low voltage electrochemical reduction process. The tribological performance of the as-prepared electrochemically reduced graphene oxide (ERGO) nanosheet coatings on copper disk are evaluated by sliding against steel ball in humid air. The friction coefficient of copper is reduced to 1/6 its value, and its specific wear rate is reduced more than two orders of magnitude when copper disk is coated with ERGO nanosheet coatings. These improved tribological performance are attributed to the presence of ERGO nanosheets in the sliding interface of steel vs. copper friction pair. They not only provide easy shearing, reducing the friction coefficient, but also effectively suppress abrasive wear and adhesive wear, decreasing the wear rate of copper disk.
危险品化学品经营许可证（带存储）