3 years ago

High-efficiency preparation of oil-dispersible MoS 2 nanosheets with superior anti-wear property in ultralow concentration

Liping Wang, Guangneng Dong, Junfeng Zhang, Blake Johnson, Shuncheng Yang, Hongxing Wu

Abstract

Molybdenum disulfide (MoS2) nanosheets are a promising lubricant additive for enhanced engine efficiency in cars. However, high-cost production methods and poor dispersion have limited their application in industry. In this study, the ball milling process is demonstrated as a low-cost and high-efficient method for fabrication of oil-dispersible MoS2 nanosheet, and the ball milling parameters are optimized. Moreover, the lubrication effectiveness of ball-milled MoS2 nanosheet was also evaluated. Results indicated that well-dispersed MoS2 nanosheets with a size of 250 nm can be manufactured with optimized surfactants of zinc dialkyldithiphosphates (ZDDP) and polyisobutylene succinimide (PIBS) after being ball milled for 36 h. Tribological results revealed that a friction coefficient of white oil with 0.25% MoS2 nanosheets reached 0.075, much lower than that of lubricant without nanosheets (0.16). The wear scar radius of 0.015% MoS2 nanosheets was similar with that of Hertz contact, and the wear scar radius reduction reached 20% compared with that of 1% ZDDP. In addition, EDS and XPS results indicated the formation of a MoS2 and FeS tribofilm on the wear surface.

Publisher URL: https://link.springer.com/article/10.1007/s11051-017-4035-z

DOI: 10.1007/s11051-017-4035-z

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