Effect of yttrium doping on the structure and tribological properties of MoSx coatings in humid atmosphere

IF 8.7 Q1 CHEMISTRY, PHYSICAL

Applied Surface Science Advances Pub Date : 2025-08-19 DOI:10.1016/j.apsadv.2025.100825

Junhao Wan, Zhaofan Yue, Huan Huan, Min Dan, Guoqing Tang, Fanya Jin

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引用次数: 0

Abstract

MoS₂ is prone to oxidation and moisture-induced decomposition in humid environments, leading to a sharp decline in its frictional properties. This significantly restricts the application scope of MoS₂. Therefore, modifying MoS₂ to enhance its frictional performance in humid conditions is of great necessity. To this end, MoS_x-Y composite coatings with varying yttrium contents were fabricated by direct current magnetron sputtering. The effects of Y doping and its concentration on the structural characteristics, mechanical properties, and tribological performance of MoS_x coatings were systematically investigated using SEM, XPS, XRD, nanoindentation, and friction tests. The results indicate that the doped Y element mainly existed in the form of Y₂O₃ within the coating. As the Y element content increased, the hardness and elastic modulus of the MoS_x-Y composite coating gradually increased. The tribological properties of the coatings with different Y contents under a humid atmosphere (RH=60 %) were comprehensively evaluated through rotary friction experiments. The experimental results reveal that the introduction of appropriate Y contents can effectively reduce the friction coefficient of the MoS_x coating in a humid environment to approximately 0.1, and significantly enhance its friction life. The doping of the Y element inhibits the growth of the (100) and (110) planes of MoS_x, causing the coating to grow preferentially along the (002) plane, which is an important factor contributing to the enhancement of the tribological properties of the MoS_x coating by yttrium doping. This work demonstrates the controllability and potential of the tribological properties of the MoS_x coating.

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湿润气氛中钇掺杂对MoSx涂层结构和摩擦学性能的影响

MoS2在潮湿的环境中容易氧化和受潮分解，导致其摩擦性能急剧下降。这极大地限制了二硫化钼的应用范围。因此，对二硫化钼进行改性以提高其在潮湿条件下的摩擦性能是非常有必要的。为此，采用直流磁控溅射法制备了不同钇含量的MoSx-Y复合镀层。采用扫描电镜（SEM）、XPS、XRD、纳米压痕和摩擦试验等方法，系统研究了Y掺杂及其浓度对MoSx涂层结构特征、力学性能和摩擦学性能的影响。结果表明，掺杂的Y元素主要以Y2O3的形式存在于涂层内。随着Y元素含量的增加，mox -Y复合涂层的硬度和弹性模量逐渐增大。通过旋转摩擦试验，综合评价了不同Y含量涂层在湿度（RH= 60%）下的摩擦学性能。实验结果表明，引入适当的Y含量可有效降低MoSx涂层在潮湿环境下的摩擦系数至0.1左右，并显著提高其摩擦寿命。Y元素的掺杂抑制了MoSx的（100）面和（110）面生长，使涂层优先沿（002）面生长，这是钇掺杂提高MoSx涂层摩擦学性能的重要因素。这项工作证明了MoSx涂层摩擦学性能的可控性和潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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