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MoS_2/Pb-Ti多层薄膜的结构和摩擦学性能
Authors
张广安
王立平
薛群基
赵晓宇
Publication date
1 January 2018
Publisher
Abstract
目的设计Mo S_2/Pb-Ti多层薄膜,改善真空和大气环境下的摩擦学性能。方法采用磁控溅射技术沉积Mo S_2/Pb-Ti多层薄膜,通过扫描电镜(SEM)、X射线衍射(XRD)、纳米压痕仪、真空和大气摩擦磨损实验,分别评价MoS_2/Pb-Ti多层薄膜的表面形貌、微观结构、力学性能、真空和大气环境下的摩擦学性能,并通过光学显微镜、能谱仪(EDS)、Raman光谱仪对磨痕及磨斑进行分析。结果随着MoS_2层厚度的增加,MoS_2/Pb-Ti多层薄膜的表面颗粒逐渐细化,变得更加光滑。同时,微观结构由金属相主导转变为由MoS_2相主导,弹性模量逐渐降低,硬度则先升高后降低。在真空环境下,Mo S_2/Pb-Ti多层薄膜的摩擦系数低至0.01,磨损率低至2.2×10~(-7) mm~3/(N·m),大气环境下摩擦系数低至0.07左右,磨损率低至2.7×10~(-7) mm~3/(N·m)。结论在真空摩擦磨损实验中,MoS_2层厚度过薄时,MoS_2/Pb-Ti多层薄膜的磨损机制为粘着磨损,MoS_2层厚度增加有助于形成稳定的转移膜,使得摩擦磨损大幅降低。在大气摩擦磨损实验中,Ti保护MoS_2的结构免于H_2O和O_2的破坏,使体系具有低而稳定的摩擦磨损
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Last time updated on 07/01/2019