在老化时在MoS2中发生的表面化学过程的光谱评估
Robert Chrostowski1,2, John F Curry3, Michael T Dugger3
1Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United States.
ACS applied materials & interfaces
|July 24, 2023
概括
二硫化物 (MoS) 固体滑剂的老化与湿度有关. 这项研究揭示了MoS2涂层中的水运输和表面氧化如何受到tribological压力和热变化的影响.
科学领域:
- 材料科学 材料科学 材料科学
- 部落学 (tribology) 是一个学科.
- 表面化学 表面化学
背景情况:
- 硫化 (MoS2) 是一个有前途的固体滑剂,但由于老化,其性能在环境条件下下降.
- 衰老的特征是表面剪切强度增加,这归因于水和氧的相互作用,但确切的机制仍然不清楚.
- 由于热或三元学压力的微结构变化对MoS老化的影响尚不清楚.
研究的目的:
- 在环境条件下阐明二硫化 (MoS) 涂层的老化机制.
- 研究水和氧在MoS2表面化学演化中的作用.
- 评估热和三角学治疗对MoS2衰老的影响.
主要方法:
- 用于表面化学分析的X射线光电子光谱 (XPS).
- 飞行时间二次离子质谱 (ToF-SIMS) 用于元素和分子表面组成.
- 用于微观结构特征的草地发射率X射线衍射 (GIXRD).
- Tribological测试模拟现实世界的磨损条件.
主要成果:
- XPS数据表明,MoS2的显著表面氧化仅在潮湿条件下发生.
- 结合XPS,ToF-SIMS和GIXRD分析提供了一个模型,说明剪切诱导的微结构变化如何影响水运输和氧化.
- 热诱导的结构变化被评估为它们对衰老过程的影响.
结论:
- 湿度是推动MoS涂料表面氧化和老化的关键因素.
- 由于剪切应力的微结构变化在促进水的入和随后的氧化中起着关键作用.
- 了解这些衰老机制对于提高MoS滑剂在tribological应用中的可靠性至关重要.
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