Environmental Impact on Crystallization of MoS2 Composites Under Pressure and Shear

IF 3.3 3区工程技术 Q2 ENGINEERING, CHEMICAL

Tribology Letters Pub Date : 2026-02-12 DOI:10.1007/s11249-026-02114-3

Tomas F. Babuska, Alexander Mings, Steven R. Larson, Michael T. Dugger, John F. Curry

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引用次数: 0

Abstract

Molybdenum disulfide (MoS₂) coatings are a popular option for lubrication in aerospace and hermetic applications due to low friction/wear in dry environments. Infrequent exposure to humid environments or testing in terrestrial atmospheres can negatively impact the performance and structure of pure MoS₂ coatings, necessitating the use of dopants to counteract degradation. Composite MoS₂ coatings commonly utilize dopants like Ti, C, Cr, Ni, Sb₂O₃, Pb or Au, many of which have shown improved performance over un-doped MoS₂ coatings leading to the adoption of a variety of composite formulations across industrial applications. This work focuses on the widely used MoS₂-Sb₂O₃-Au coatings and their anomalously high friction behavior (µ > 1) in humid environments at nominal contact pressures (~ 0.5 to 1 GPa) without coating failure. The origin of these high friction deviations is investigated using high-throughput tribological testing in environments with varying contact pressure and humidity. The Sb₂O₃ and Au composition is varied to understand the role of dopants in promoting high and low friction sliding interfaces. The results from this work suggest that increasing dopant concentration, like increasing water concentration or reducing contact pressure, is another source for inhibition of MoS₂ recrystallization in the sliding contact leading to abrasive, high friction interfaces.

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压力和剪切作用下环境对MoS2复合材料结晶的影响

二硫化钼（MoS2）涂层由于在干燥环境中摩擦/磨损低，是航空航天和密封应用中润滑的热门选择。不经常暴露于潮湿环境或在地面大气中进行测试会对纯二硫化钼涂层的性能和结构产生负面影响，因此需要使用掺杂剂来抵消降解。复合MoS2涂层通常使用Ti、C、Cr、Ni、Sb2O3、Pb或Au等掺杂剂，其中许多掺杂剂比未掺杂的MoS2涂层表现出更好的性能，从而在工业应用中采用各种复合配方。本研究重点研究了广泛使用的MoS2-Sb2O3-Au涂层及其在潮湿环境下在名义接触压力（~ 0.5至1 GPa）下的异常高摩擦行为（μ > 1）而不会导致涂层失效。在不同的接触压力和湿度的环境中，使用高通量摩擦学测试来研究这些高摩擦偏差的起源。通过改变Sb2O3和Au的组成来了解掺杂剂在促进高摩擦和低摩擦滑动界面中的作用。本工作的结果表明，增加掺杂浓度，如增加水浓度或降低接触压力，是抑制MoS2在滑动接触中再结晶的另一个来源，从而导致磨蚀性，高摩擦界面。

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

Tribology Letters 工程技术-工程：化工

CiteScore

5.30

自引率

9.40%

发文量

116

审稿时长

2.5 months

期刊介绍： Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.