Enhancement of humid environment resistance and tribological properties of MoS2-based films by LaF3 doping

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-02-01 DOI:10.1016/j.surfcoat.2025.131758

Shifan Ju , Li Ji , Xiaohong Liu , Xiaoqin Zhao , Huidi Zhou , Jianmin Chen , Hongxuan Li , Junshuai Li

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Abstract

Spacecraft and their components are exposed to two different humid environments during assembly and before launch. In order to ensure the reliability and long service life of spacecraft, higher demands are required on the tribological properties of MoS₂-based films in humid atmospheric environments and after long periods of storage in hot and humid environments. We have optimized conventional MoS₂-based films by magnetron sputtering doped with LaF₃. The rare-earth component La improves the film structure of the conventional metallic MoS₂-Ti films, and F reduces the surface energy of the films and, at the same time, improves the film structure and humidity resistance. The friction lifetime of MoS₂-based films under high humidity atmospheric conditions (>2 × 10⁵ laps) was significantly improved. TEM and XPS revealed that the film structure was optimized to block water vapor and oxygen erosion gaps under humid and hot environments to form a dense protective layer. After six months of storage in a hot and humid environment, the film maintains superior tribological characteristics, with a coefficient of friction as low as 0.014 and a friction lifetime of over 1 × 10⁶ laps.

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.