Temperature-adaptive MoN-Ag coatings under operando tribology: multiscale Ag diffusion-oxidation coupling

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2025-10-09 DOI:10.1016/j.apsusc.2025.164842

Yong Cheng , Yupeng Zhang , Yiqun Feng, Meiqi Zhang, Aiying Wang, Zhenyu Wang

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Abstract

The development of temperature-adaptive lubricant coatings for foil air bearings remains a major challenge. Here, dense MoN–Ag nanocomposite coatings with varying Ag contents (0–22.8 at.%) were deposited by HiPIMS–DCMS. The coatings exhibited low residual stress, strong adhesion, and high mechanical performance. Tribological tests showed that the coefficient of friction (COF) decreased with Ag addition at 350 °C and 500 °C, reaching 0.389 and 0.223, respectively, for the 22.8 at.% Ag coating. At 600 °C, however, the COF increased with Ag content, while the 13.4 at.% Ag coating displayed the lowest wear rate of 2.84 × 10^-5 mm³N^-1m⁻¹. Under simulated service conditions, the 13.4 at.% Ag coating demonstrated a reduction in COF from ∼ 0.4 to 0.26 across 25–600 °C, evidencing self-adaptive lubrication. This behavior is ascribed to the formation of a low-shear-strength surface layer, where Ag diffusion and the generation of MoO_x, Ag₂MoO₄, and Ag₂Mo₄O₁₃ promote facile slip along crystal planes, thereby enhancing lubricity.

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操作摩擦下的温度自适应mo -Ag涂层：多尺度Ag扩散-氧化耦合

开发温度自适应的铝箔空气轴承润滑涂层仍然是一个重大挑战。在这里，不同Ag含量（0-22.8 at）的致密的mo - Ag纳米复合涂层。%)由HiPIMS-DCMS沉积。涂层具有残余应力小、附着力强、力学性能高等特点。摩擦学试验表明，在350 °C和500 °C温度下，银的加入降低了摩擦系数（COF），在22.8℃时分别达到0.389和0.223。% Ag涂层。在600 °C时，COF随Ag含量的增加而增加，而在13.4°C时，COF随Ag含量的增加而增加。% Ag涂层的磨损率最低，为2.84 × 10-5 mm3N-1m−1。在模拟使用条件下，13.4 at。在25-600 °C范围内，% Ag涂层的COF从 ~ 0.4降低到0.26，证明了自适应润滑。这种行为是由于形成了低剪切强度的表面层，其中Ag的扩散和MoOx、Ag2MoO4和Ag2Mo4O13的生成促进了沿晶面的易滑移，从而增强了润滑性。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.