Effect of Water on Wear of DLC Coatings in High Temperature and Pressurized Ethanol

IF 2.9 3区工程技术 Q2 ENGINEERING, CHEMICAL

Tribology Letters Pub Date : 2024-09-04 DOI:10.1007/s11249-024-01910-z

T. Tokoroyama, S. Horikawa, J. Mimata, N. Umehara, M. Murashima

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Abstract

The friction and wear characteristics of a-C:H:Si and a-C:H coatings in an ethanol environment at 120 °C and 10 MPa focusing on the effects of water and dissolved oxygen in ethanol were investigated. The friction tests were conducted using an autoclave chamber, with gases (oxygen or nitrogen) and ethanol–water mixtures (0 and 6 vol.%). The wear acceleration of a-C:H:Si took place when it slid in ethanol with 6 vol.% water and pressurized by oxygen, thus the specific wear rate was the highest, approximately 1.8 × 10⁻⁷ mm³/Nm. The reason of this wear acceleration was assumed the effect of hardness reduction due to oxidation of the a-C:H:Si, so the O/C ratio by AES and the hardness of topmost surface by AFM nano-scratch were investigated. As a result, the higher O/C ratio showed higher specific wear rate due to the hardness reduction from 13.3 to 6.0 GPa. These findings highlight the role of water and dissolved oxygen in accelerating wear of a-C:H:Si coatings.

Graphical abstract

Abstract Image

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水在高温和加压乙醇中对 DLC 涂层磨损的影响

研究了 a-C:H:Si 和 a-C:H 涂层在 120 °C 和 10 MPa 的乙醇环境中的摩擦和磨损特性，重点研究了乙醇中水和溶解氧的影响。摩擦试验是在高压灭菌室、气体（氧气或氮气）和乙醇-水混合物（0 和 6 vol.%）中进行的。当 a-C:H:Si 在含 6 Vol.% 水的乙醇中滑动并受到氧气加压时，磨损加速，因此比磨损率最高，约为 1.8 × 10-7 mm3/Nm。磨损加速的原因被认为是 a-C:H:Si 氧化导致硬度降低的影响，因此研究了 AES 的 O/C 比和 AFM 纳米划痕的最顶层表面硬度。结果表明，由于硬度从 13.3 GPa 降至 6.0 GPa，O/C 比越高，比磨损率越高。这些发现突出了水和溶解氧在加速 a-C:H:Si 涂层磨损中的作用。

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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.