Exploring the Tribophysics and Tribochemistry of MoS₂ by Sliding MoS₂/Ti Composite Coating Under Different Humidity

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• 作者：Hao Li ; Xia Li ; Guangan Zhang ; Liping Wang ; Guizhi Wu
• 关键词：MoS2/Ti composite coatings ; Humidity ; Oxidation resistance ; Tribology
• 刊名：Tribology Letters
• 出版年：2017
• 出版时间：June 2017
• 年：2017
• 卷：65
• 期：2
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Tribology, Corrosion and Coatings; Surfaces and Interfaces, Thin Films; Theoretical and Applied Mechanics; Physical Chemistry; Nanotechnology;
• 出版者：Springer US
• ISSN：1573-2711
• 卷排序：65

文摘

The MoS₂ coatings were prepared by unbalanced magnetron sputtering system. Ti was used as the dopant to improve its mechanical properties and oxidation resistance. The microstructure of the coatings changed from coarse columnar platelet structure at low Ti content (0–1.8 at.%) to a denser columnar microstructure at increased Ti content. The hardness and elastic modulus of the MoS₂/Ti composite coatings gradually increase as the Ti content increases. The tribological properties of the coatings were evaluated against a GCr15 ball under different relative humidity atmosphere to verify the oxidation resistance. The results show that doping of Ti can significantly improve the oxidation resistance of the coatings. Particularly, the friction coefficient for the composite coating with 10.8 at.% Ti exhibited almost the same friction coefficient under three different humidity. However, excessive Ti induced high brittleness and the coatings flaking easily from the substrate; therefore, the coatings show poor wear resistances under both dry and humidity atmospheres.