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The effect of temperature on water desorption and oxide formation in MoS2 coatings and its impact on tribological properties
Surface & Coatings Technology ( IF 5.4 ) Pub Date : 2022-01-06 , DOI: 10.1016/j.surfcoat.2021.128077
Kristine Dreva 1 , Ardian Morina 1 , Liuquan Yang 1 , Anne Neville 1
Affiliation  

Molybdenum disulfide (MoS2) is used extensively in aerospace applications, where liquid lubricants are not suitable. MoS2 has excellent tribological properties in vacuum, however, further research is required to fully understand the mechanisms taking place when exposed to varying temperatures in ambient atmosphere due to storage and on-ground testing. MoS2 coatings were deposited on AISI 440C steel substrates, friction and wear tests were conducted at increasing temperatures, up to 75 °C, determining the effect of temperature on wear mechanisms in air. It was found that the detected surface oxides do not impact tribological properties in MoS2 at temperatures around 75 °C. The water molecules at room temperature hinder the alignment of MoS2 layers leaving some active edge sites exposed to contacting surfaces, leading to high friction and wear. Desorption of water molecules promote parallel alignment of layers, reducing shear strength, friction and wear.



中文翻译:

温度对 MoS2 涂层中水解吸和氧化物形成的影响及其对摩擦学性能的影响

二硫化钼 (MoS 2 ) 广泛用于航空航天应用,其中液体润滑剂不适用。MoS 2在真空中具有出色的摩擦学特性,但是,需要进一步研究以充分了解由于储存和地面测试而暴露于环境大气中不同温度时发生的机制。MoS 2涂层沉积在 AISI 440C 钢基材上,在最高 75 °C 的温度下进行摩擦和磨损测试,确定温度对空气中磨损机制的影响。发现检测到的表面氧化物不会影响 MoS 2中的摩擦学特性在 75 °C 左右的温度下。室温下的水分子阻碍了 MoS 2层的排列,使一些活性边缘部位暴露于接触表面,导致高摩擦和磨损。水分子的解吸促进层的平行排列,降低剪切强度、摩擦和磨损。

更新日期:2022-01-14
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