Self-adaptive lubricating behavior of VAlN/Ag multi-layer coating at simulated operating conditions

IF 11.2 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Yupeng Zhang, Zhenyu Wang, Yan Zhang, Xiaojing Bai, Shenghao Zhou, Hao Li, Yong Cheng, Aiying Wang, Peiling Ke
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Abstract

Solid lubricating coatings play a crucial role in preventing friction and wear failure of the hot-end sliding components in aviation engines. In this study, VAlN/Ag multi-layer coatings with excellent interfacial matching were fabricated using a hybrid magnetron sputtering technique. The type and energy of discharge plasmas were analyzed to comprehend their effects on depositing coatings. The coatings exhibit self-adaptive lubrication properties during the designed consecutive friction with stepwise heating from 25 °C to 650 °C. The microstructure evolution during early friction facilitates sufficient tribo-chemical reaction at 650 °C, leading to the formation of a distinctive "ball-on-rail" structure that significantly reduces friction coefficient. Based on the first-principles calculations, it was found that the bond energy of Ag−O is lower than that of V−O in both AgVO3 and Ag3VO4, which promotes slipping along the (110) crystal plane and contributes to exceptional tribological properties. The fatigue wear failure mechanism of hard coatings under the thermal-force coupling effects has been elucidated, alongside an exploration of consecutive tribology mechanism at atomic scales over a wide temperature range.

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来源期刊
Journal of Materials Science & Technology
Journal of Materials Science & Technology 工程技术-材料科学:综合
CiteScore
20.00
自引率
11.00%
发文量
995
审稿时长
13 days
期刊介绍: Journal of Materials Science & Technology strives to promote global collaboration in the field of materials science and technology. It primarily publishes original research papers, invited review articles, letters, research notes, and summaries of scientific achievements. The journal covers a wide range of materials science and technology topics, including metallic materials, inorganic nonmetallic materials, and composite materials.
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