Self-forming LaF3-Ti-MoS2/Ti-DLC nanomultilayer films for excellent atmospheric-vacuum alternating tribological performance

IF 3.9 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Vacuum Pub Date : 2025-04-01 Epub Date: 2025-02-01 DOI:10.1016/j.vacuum.2025.114099

Yaxin Zhang , Yongqi Zhu , Shifan Ju , Hongxuan Li , Pengfei Ju , Jingzhou Liu , Wenge Fan , Chufeng Sun , Xiaohong Liu , Xingping Luo , Jia Li , Li Ji

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Abstract

Spacecraft components need to fulfill requirements for low friction and long service life in alternating atmospheric-vacuum environments. In this study, based on the lubricating characters of LaF₃-Ti-MoS₂ in vacuum and Ti-DLC in the atmospheric environment, LaF₃-Ti-MoS₂/Ti-DLC(MTLC) multilayer films are designed and self-formed by controlling the residence time of the sample at the target position in magnetron sputtering process. The effect of rotational speed on the microstructure, mechanical properties, and tribological performance of the MTLC films are systematically investigated. The multilayer structure exhibits excellent mechanical properties at the rotational speed of 0.5 rpm, which allows the MTLC films to achieve a lifespan exceeding 2 × 10⁵ laps in alternating atmospheric-vacuum environments. Transmission electron microscope(TEM) results suggest the environmentally adaptive mechanism is that the LaF₃-Ti-MoS₂ layer acts effective in vacuum and the Ti-DLC layer acts effective in atmosphere. This dynamic interplay between the layers contributes to the prolonged lifespan of the films in these alternating environments, highlighting their potential for various space applications.

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自形成的LaF3-Ti-MoS2/Ti-DLC纳米多层膜具有优异的大气-真空交替摩擦性能

航天器部件需要满足在大气-真空交替环境下的低摩擦和长使用寿命的要求。本研究基于LaF3-Ti-MoS2在真空环境和Ti-DLC在大气环境下的润滑特性，设计了LaF3-Ti-MoS2/Ti-DLC（MTLC）多层膜，并在磁控溅射过程中控制样品在目标位置的停留时间。系统地研究了转速对MTLC薄膜微观结构、力学性能和摩擦学性能的影响。该多层结构在0.5 rpm转速下表现出优异的力学性能，使得MTLC薄膜在大气-真空交替环境下的寿命超过2 × 105圈。透射电镜（TEM）结果表明，环境适应机制是LaF3-Ti-MoS2层在真空中有效，Ti-DLC层在大气中有效。这些层之间的动态相互作用有助于延长薄膜在这些交替环境中的使用寿命，突出了它们在各种空间应用中的潜力。

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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.