Effect of Ti content on the microstructure and wear performance in vacuum of Ti-Ag/MoS2 composite films

IF 3.9 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2025-09-25 DOI:10.1016/j.vacuum.2025.114765

Xingguo Feng, Hong Hao, Yugang Zheng, Lamaocao Yang, Keliang Wang, Kaifeng Zhang, Hui Zhou

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引用次数: 0

Abstract

Molybdenum disulfide (MoS₂) films have emerged as a critical material in space lubrication systems, but the escalating operational demands for high-load capacity and extended service durability in spacecraft mechanisms necessitate substantial enhancement of MoS₂-based coatings. To address this challenge, the Ti-Ag/MoS₂ composite films were prepared by unbalanced magnetron sputtering technology. Comprehensive characterization using advanced analytical techniques including FESEM, HRTEM, and XRD revealed that titanium doping induces a structural transformation in Ag/MoS₂ coatings, promoting the formation of a dense amorphous structure. Notably, the crystalline ordering exhibited an inverse correlation with titanium concentration. The friction and wear properties of Ti-Ag/MoS₂ films were evaluated in vacuum under combined high loads and rotational speed. It is confirmed that MoS₂ films binary-doped with Ti and Ag had a significant improvement in friction and wear properties; the optimized Ti (12.8 at%)-Ag/MoS₂ film achieved an ultra-low steady-state friction coefficient of 0.01 and wear rate of 6.0 × 10⁻⁸ mm³/N m. In practical bearing applications, the Ti (12.8 at%)-Ag/MoS₂ coated components demonstrated a 29 % reduction in average friction torque and a 35 % decrease in torque fluctuation amplitude compared to Ag/MoS₂ counterparts. These results confirm that the ternary doping strategy successfully reconciles the inherent conflict between friction reduction and wear resistance.

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Ti含量对Ti- ag /MoS2复合膜微观结构及真空磨损性能的影响

二硫化钼（MoS2）薄膜已成为空间润滑系统的关键材料，但航天器机构对高负载能力和延长服务耐久性的不断升级的操作需求需要大幅增强MoS2基涂层。为了解决这一问题，采用非平衡磁控溅射技术制备了Ti-Ag/MoS2复合薄膜。利用FESEM、HRTEM和XRD等先进分析技术对Ag/MoS2涂层进行了综合表征，发现钛的掺杂导致了镀层的结构转变，促进了致密非晶结构的形成。值得注意的是，结晶顺序与钛浓度呈负相关。在真空条件下，对Ti-Ag/MoS2薄膜在高载荷和转速下的摩擦磨损性能进行了研究。结果表明，掺Ti和Ag的MoS2薄膜摩擦磨损性能明显改善；优化后的Ti (12.8 at%)-Ag/MoS2薄膜的稳态摩擦系数为0.01，磨损率为6.0 × 10−8 mm3/N m。在实际轴承应用中，与Ag/MoS2相比，Ti (12.8 at%)-Ag/MoS2涂层元件的平均摩擦扭矩降低了29%，扭矩波动幅度降低了35%。这些结果证实，三元掺杂策略成功地解决了摩擦减量和耐磨性之间的内在冲突。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.