Structural evolution and wear resistance of MoS2–Based lubricant films irradiated by heavy ions

Zewen Duan, Xiaoyu Zhao, Li Qiao, Yunbiao Zhao, Engang Fu, Peng Wang, Weimin Liu

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

In this work, a 2 MeV Au2+ ion irradiation was implemented to simulate the neutron damage on magnetron sputtered MoS2-based composite films. The irradiation damage mechanism and the wear resistance of films were accessed as a function of increasing Au2+ fluence. The XRD as well as the cross-section TEM images results reveal that the intrinsic crystallites of MoS2 in Mo-S-Ti composite films are more easily to be destructed. At the low fluence of 1 × 1014 Au2+/cm2, the irradiation damage peak was mainly distributed in depth of 0.45 μm – 0.7 μm in films. While, with the increase of the incident fluence, the disordering of MoS2 crystallites near the film surface were also become serious, and they are fully amorphized at the end of the studied fluence of 3.3 × 1015 ion/cm2 due to the accumulation effect induced by the ion collisions. Nonetheless, the tribotests in vacuum show that the lubricity of MoS2 phases would not be immediately failured due to their damage of intrinsic structure of MoS2 crystallites, and only enhancing the irradiation to the high dose (2, 5 and 1 dpa), a rapid degradation of lubricity will be observed.

Original languageEnglish
Article number125077
JournalSurface and Coatings Technology
Volume378
DOIs
StatePublished - 25 Nov 2019
Externally publishedYes

Keywords

  • Friction coefficient
  • Ion irradiation
  • Microstructure evolution
  • MoS-Based composite films
  • Wear lives

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