In Situ and Ex Situ Analysis of the Reciprocating Sliding Wear Behavior of Cold Sprayed CrMnCoFeNi Cantor HEA Coatings in Dry Air and Ambient Air Conditions

IF 3.3 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Maya M. Harfouche, Sima A. Alidokht, Richard R. Chromik
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Abstract

This study examined and compared the tribological properties of a cold-sprayed CrMnCoFeNi high entropy alloy (Cantor alloy) coating under ambient and dry air conditions. Tribological testing was conducted using an in situ tribometer equipped with video microscopy, allowing real-time monitoring of the evolution of the sliding interfaces through a transparent sapphire counterface. This experimental setup provided the opportunity to observe phenomena that would otherwise remain concealed between the contacting bodies. The wear rate was 1.8 ± 0.5 × 10⁻4 mm3/Nm in ambient air and 7.5 ± 0.7 × 10⁻4 mm3/Nm in dry air. In dry air, the velocity accommodation mode was characterized by interfacial sliding of a static transfer film against the wear track, resulting in a stable steady-state coefficient of friction (CoF) of 0.5. In contrast, ambient air conditions led to an average CoF of 0.8, with fluctuations attributed to plastic shearing of the transfer film observed in situ. The higher humidity in ambient air inhibited cold welding of wear particles, resulting in a less stable transfer film that underwent removal or extrusion events, which were associated with sudden drops in CoF. Additionally, a “metal debris” oxide formation mechanism was observed in ambient air, contributing to the formation of a protective tribofilm and a reduction in the wear rate. In dry air, the “oxidation-scrape-reoxidation” mechanism dominated, facilitated by the absence of adsorbed water droplets. This resulted in an increased wear rate under dry conditions.

Graphical Abstract

冷喷涂CrMnCoFeNi Cantor HEA涂层在干燥空气和环境空气条件下往复滑动磨损行为的原位和非原位分析
研究并比较了常温和干燥空气条件下冷喷涂CrMnCoFeNi高熵合金(康托合金)涂层的摩擦学性能。使用配备视频显微镜的原位摩擦计进行摩擦学测试,可以通过透明蓝宝石台面实时监测滑动界面的演变。这个实验装置提供了观察现象的机会,否则将保持隐藏在接触体之间。磨耗率在环境空气中为1.8±0.5 × 10 - 3毫米/毫米,在干燥空气中为7.5±0.7 × 10 - 3毫米/毫米。在干燥空气中,速度调节模式的特征是静态传递膜在磨损轨迹上的界面滑动,导致稳定的稳态摩擦系数(CoF)为0.5。相比之下,环境空气条件导致的平均CoF为0.8,其中波动归因于原位观察到的转移膜的塑性剪切。环境空气中较高的湿度抑制了磨损颗粒的冷焊,导致传递膜不稳定,发生了移除或挤压事件,这与CoF的突然下降有关。此外,在环境空气中观察到“金属碎片”氧化物形成机制,有助于形成保护性摩擦膜并降低磨损率。在干燥空气中,由于没有吸附的水滴,“氧化-刮擦-再氧化”机制占主导地位。这增加了干燥条件下的磨损率。图形抽象
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来源期刊
Tribology Letters
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.
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