The Effect of Carbon Structure of DLC Coatings on Friction Characteristics of MoDTC-Derived Tribofilm by Using an In Situ Reflectance Spectroscopy

IF 2.9 3区工程技术 Q2 ENGINEERING, CHEMICAL Tribology Letters Pub Date : 2024-02-09 DOI:10.1007/s11249-024-01829-5

Naoya Hashizume, Yusei Yamamoto, Cheng Chen, Takayuki Tokoroyama, Ruixi Zhang, Dongfeng Diao, Noritsugu Umehara

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Abstract

In this study, six types of DLC coatings were prepared, featuring different carbon structures (including amorphous ta-C coatings and GNC coatings with nanocrystallites) and different doped Ta amounts, to investigate friction characteristics. The results of friction tests with MoDTC-added lubricant revealed a consistent trend: DLC coatings with a higher I_D/I_G ratio exhibited lower friction coefficients. In addition, in situ observations using reflectance spectroscopy highlighted that the tribofilm formed on DLC coatings with a higher I_D/I_G ratio maintained a higher \({{\text{MoS}}}_{2}/({{\text{MoS}}}_{2}+{{\text{MoO}}}_{3})\) ratio, which exhibited a strong correlation with the friction coefficient. Measurements of a work function of each DLC coating indicated that those with a higher I_D/I_G ratio had a higher work function, suggesting the inclusion of a larger amount of graphite structure defects. These active defects in the graphite structure were deemed responsible for enhancing the friction reduction effect of MoDTC. The outcomes of this study propose a material design approach for DLC coatings that amplifies the effectiveness of lubricant additives in friction reduction.

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利用原位反射光谱分析 DLC 涂层的碳结构对 MoDTC 衍生三薄膜摩擦特性的影响

本研究制备了六种不同碳结构的 DLC 涂层（包括无定形 ta-C 涂层和具有纳米晶粒的 GNC 涂层）和不同掺杂量的 Ta，以研究摩擦特性。添加 MoDTC 润滑剂的摩擦测试结果显示了一致的趋势：内径/内径比越高的 DLC 涂层的摩擦系数越低。此外，利用反射光谱法进行的原位观察突出表明，ID/IG 比值较高的 DLC 涂层上形成的三膜保持了较高的\({{text{MoS}}_{2}/({{text{MoS}}}_{2}+{{text{MoO}}}_{3})\)比值，这与摩擦系数有很强的相关性。对每种 DLC 涂层功函数的测量结果表明，ID/IG 比值越高的 DLC 涂层功函数越高，这表明其中包含了更多的石墨结构缺陷。石墨结构中的这些活性缺陷被认为是增强 MoDTC 减摩效果的原因。这项研究的结果提出了一种 DLC 涂层的材料设计方法，这种方法可以提高润滑油添加剂的减摩效果。

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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.