A novel design by constructing MoS2/WS2 multilayer film doped with tantalum toward superior friction performance in multiple environment

作者：Lu, Zhaoxia; Zhang, Chaozhi; Zeng, Chun; Ren, Siming^*; Pu, Jibin^*

来源：Journal of Materials Science, 2021, 56(31): 17615-17631.

DOI：10.1007/s10853-021-06217-1

• TRIBOLOGICAL PROPERTIES
• COMPOSITE COATINGS
• MOS2-BASED COATINGS
• WEAR
• METAL
• MICROSTRUCTURE
• CORROSION
• BEHAVIOR
• STEEL
• STOICHIOMETRY

Transition metal dichalcogenides (TMDs) are easily oxidized in the humid atmosphere, leading to a decrease in their lubricating properties and limiting their application. In this study, a MoS2/WS2 multilayer film doped with tantalum (MoS2/WS2-Ta) is fabricated by magnetron sputtering to improve the corrosion and oxidation resistance of TMDs. Results show that doping of Ta makes the structure of the MoS2/WS2 multilayer film more compact, and the MoS2 and WS2 crystals exhibit a stronger (0002) preferred orientation than that of un-doped sample. Such compact structure and (0002) preferred orientation of MoS2/WS2-Ta can realize a high corrosion resistance, i.e., a more positive corrosion potential and a lower corrosion current density in comparison with the MoS2/WS2 multilayer. Furthermore, the friction properties of MoS2/WS2 multilayer film doped with 1.1 at% of Ta are improved remarkably under both of high temperature (370 degrees C in air) and vacuum conditions, the result is attributed to its high mechanical properties and (0002) preferred orientation. In a word, the combination of multilayer structure and doping of Ta into the films is a promising approach to accurately design the TMDs toward a wide temperature range and environmentally adaptive lubricants. @@@ [GRAPHICS] @@@ .

• 单位
  中国科学院; 广西大学; 中国科学院宁波材料技术与工程研究所