Environmentally adaptive lubrication enabled by gradient structure design of TiN-MoS2/Ti
Environmentally adaptive lubrication enabled by gradient structure design of TiN-MoS2/Ti
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DOI：
10.1016/j.surfcoat.2023.129317
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发表时间：
2023-02
影响因子：
5.4
通讯作者：
Siming Ren;W. Cao;Mingjun Cui;Haixin Wang
中科院分区：
文献类型：
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作者：
Siming Ren;W. Cao;Mingjun Cui;Haixin Wang
二硫化钼（MoS 2）薄膜已被广泛用作机械部件的润滑剂，但仍面临着重大的工程挑战，包括其低硬度、高湿度敏感性和对基材的弱粘附性。虽然MoS 2与添加剂的共沉积在某些情况下提供了增强的功能，但MoS 2与基底的弱粘附是膜的局部分层甚至早期失效的关键。本文采用磁控溅射沉积技术设计并制备了一种新型的MoS 2基薄膜，该薄膜由Ti粘结层、TiN承载层、TiN/Ti/MoS 2梯度层和Ti掺杂MoS 2润滑薄膜顶层组成。结果表明，合理的梯度设计不仅提高了MoS 2与基体的结合强度，而且促进了MoS 2沿垂直于（002）晶面的[001]晶带轴择优生长。3.2at.% Ti掺杂MoS 2薄膜在盐雾试验前后均表现出较低的摩擦系数和磨损率，这是由于形成了连续致密的MoS 2摩擦膜所致。此外，Ti添加剂可以优先吸收空气中的氧气，从而保持MoS 2的自润滑能力。该新型结构设计为获得具有良好机械性能和环境适应性的功能润滑剂提供了范例。
Molybdenum disulfide (MoS2) films have been widely employed as lubricants for mechanical components but continue to face significant engineering challenges including their low hardness, high humidity sensitivity and weak adhesion to substrates. Although the co-deposition of MoS2with additives provides enhanced functionality in some cases, the weak adhesion of MoS2to the substrate is the key to the localized delamination or even early failure of the film. Herein, a novel MoS2-based film is designed and fabricated by magnetron sputtering deposition technique, which consists of Ti bonding layer, TiN load-carrying layer, TiN/Ti/MoS2gradient layer, and top layer of Ti-doped MoS2lubricating film. Results demonstrate that the rationally gradient design not only improves the adhesion strength between MoS2and substrate, but also promotes the preferential growth of MoS2along [001] zone axis perpendicular to the (002) crystal plane. The 3.2 at.% Ti-doped MoS2film exhibits a low friction coefficient and wear rate before and after salt spray test, which is ascribed to the formation of a continuous and dense MoS2tribofilm. Additionally, Ti additive can preferentially absorb oxygen in air, thereby preserving the self-lubricating ability of MoS2. This novel structure design provides an example for obtaining functional lubricants with good mechanical properties and environmental adaptability.