Ultra-low friction W–S–N solid lubricant coating
Ultra-low friction W–S–N solid lubricant coating
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DOI：
10.1016/j.surfcoat.2013.06.026
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发表时间：
2013-10
影响因子：
5.4
通讯作者：
F. Gustavsson;S. Jacobson;A. Cavaleiro;T. Polcar
中科院分区：
文献类型：
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作者：
F. Gustavsson;S. Jacobson;A. Cavaleiro;T. Polcar
在Ar/N2气氛中，采用反应磁控溅射方法，以WS 2为靶材，制备了W-S-N薄膜。除了对涂层的组成、结构、形貌、硬度和结合力进行标准评价外，本文的核心目标是分析涂层的摩擦学行为。化学组成为34 at.% N，12原子% O，29 at.% W和25 at.% S，和沉积膜是完全无定形的。膜厚度为2.3 μm，包括约300 nm厚的粘附性改善钛中间层。在干燥氮气中滑动时，摩擦系数小于0.003。该涂层显示出显著的耐磨性，在销对钉上的200万圈以上存活。涂层的优异摩擦性能归因于在涂层的磨损痕迹顶部和配对表面上形成的薄的二硫化钨摩擦膜。此外，涂层显示出用固体润滑剂补充受损区域的能力。我们证明了涂层从非晶状到梯度准有序结构的结构转变和有序转移层的形成改善了机械性能并从根本上降低了摩擦和磨损。
W–S–N films were deposited by reactive magnetron sputtering from WS2 target in Ar/N2atmosphere. Besides the standard evaluation of composition, structure, morphology, hardness and cohesion/adhesion, the core objective of this paper was to analyze coating tribological behavior. The chemical composition was 34 at.% N, 12 at.% O, 29 at.% W and 25 at.% S, and the as-deposited films were completely amorphous. The film thickness was 2.3 μm, including the approximately 300-nm thick adhesion improving titanium interlayer. The friction coefficient was lower than 0.003 when sliding in dry nitrogen. The coating showed remarkable wear resistance surviving more than 2 million laps on pin-on-dics. The excellent friction properties were attributed to the formation of a thin tungsten disulfide tribofilm on the top of the wear track of the coating and on the counterpart surface. Moreover, the coating showed ability to replenish damaged areas with solid lubricant. We demonstrated that a structural transformation of the coating from an amorphous-like to a gradient quasi-ordered structure and an ordered transfer layer formation improved mechanical properties and radically decreased friction and wear.