title: Synthesis of Ultrathin WS2Nanosheets and Their Tribological Properties as Lubricant Additives.
abstract: In this paper, ultrathin WS2nanosheets with thickness of about 5 nm were successfully prepared by a facile solid phase reaction method. The as-synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). On the basis of experimental results obtained under different reaction durations, a possible formation mechanism of WS2nanosheets is proposed. The tribological performance of ultrathin WS2nanosheets as additives in the 500SN base oil was tested by an UMT-2 ball-on-disc tribotester, and the worn surface of the steel disc was investigated by a non-contact optical profile testing instrument and SEM. The results showed that the friction coefficient and anti-wear property of base oil can be improved strikingly by adding ultrathin WS2nanosheets. Especially, when the concentration of WS2nanosheets was 1.0 wt.%, the corresponding lubricating oil exhibited the best tribological properties. Moreover, according to the investigation of the wear scar, an anti-friction and anti-wear mechanism is proposed. It is believed that the reduction of friction and wear must come from the addition of ultrathin WS2nanosheets which can penetrate and enter the friction interface and form a continuous tribofilm on the rubbing face.
authors.affiliation: School of Mechanical Engineering, Jiangsu University of Technology, Changzhou, 213001, Jiangsu Province, China. zxhjstu@yahoo.com.
authors.forename: Xianghua
authors.identifier: http://orcid.org/0000-0002-8512-0065
authors.initials: X
authors.lastname: Zhang
authors.affiliation: School of Mechanical Engineering, Jiangsu University of Technology, Changzhou, 213001, Jiangsu Province, China.
authors.forename: Hongxiang
authors.initials: H
authors.lastname: Xu
authors.affiliation: School of Materials and Engineering, Jiangsu University of Technology, Changzhou, 213001, Jiangsu Province, China.
authors.forename: Jiangtao
authors.initials: J
authors.lastname: Wang
authors.affiliation: School of Mechanical Engineering, Jiangsu University of Technology, Changzhou, 213001, Jiangsu Province, China.
authors.forename: Xia
authors.initials: X
authors.lastname: Ye
authors.affiliation: School of Mechanical Engineering, Jiangsu University of Technology, Changzhou, 213001, Jiangsu Province, China.
authors.forename: Weining
authors.initials: W
authors.lastname: Lei
authors.affiliation: Changzhou Vocational Institute of Light Industry, Changzhou, 213164, Jiangsu Province, China.
authors.forename: Maoquan
authors.initials: M
authors.lastname: Xue
authors.affiliation: School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, Jiangsu Province, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Tang
authors.affiliation: School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, Jiangsu Province, China.
authors.forename: Changsheng
authors.initials: C
authors.lastname: Li
keywords: Lubricant additives; Nanosheets; Tribological properties; WS2