二硫化钨
材料科学
高分辨率透射电子显微镜
二硫化钼
摩擦学
兴奋剂
透射电子显微镜
纳米压痕
电子能量损失谱
钨
干润滑剂
图层(电子)
扫描透射电子显微镜
复合材料
粘附
冶金
纳米技术
光电子学
作者
Fredrik Gustavsson,Matthieu Bugnet,Tomáš Polcar,A. Cavaleiro,Staffan Jacobson
出处
期刊:Tribology Transactions
日期:2014-10-28
卷期号:58 (1): 113-118
被引量:11
标识
DOI:10.1080/10402004.2014.951750
摘要
It has been shown many times that cosputtering low-friction coatings of molybdenum disulfide (MoS2) and tungsten disulfide (WS2) with other elements can improve the structural, mechanical, and tribological properties. To achieve the lowest friction, MoS2 or WS2 should be doped with element(s) improving the hardness and density of the coatings. On the other hand, such elements, or their compounds, should not be present in the outermost molecular layers at the sliding interface. This article suggests that there are important differences between how MoS2 and WS2 coatings respond to or react with doping elements, despite the almost identical structure and behavior of the undoped materials. Two systems have been investigated by high-resolution transmission electron microscopy (HRTEM) and scanning TEM (STEM) electron energy loss spectroscopy (EELS), W-S-C-Cr and W-S-C-Ti, and showed significant amounts of oxides, which typically formed a layer just underneath the crystalline WS2 top layer. Further, carbon was almost completely absent in the tribofilms, despite the fact that the as-deposited coatings contained as much as 40–50 at% C. An interesting observation here is that WS2 basal planes surround or embed Fe wear particles, suggesting a relatively strong adhesion or a Fe-S chemical bonding between iron/steel and WS2. The result of this is that the wear particles become pacified and remain in the contact as low-friction material.
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