Tribological properties ofnano-WS2 lubricating oil additives under DC magnetic field

doi:10.11949/0438-1157.20181312

Abstract

Abstract:

A DC magnetic field generator was assembled around the friction region in a four-ball tester. The tribological properties of 150SN base oil and lubricating oil containing modified nano-WS₂ under and without DC magnetic field were studied by modified tribo-tester. The morphology, the content and chemical species of typical elements on the worn surfaces lubricated with the tested oil were examined by SEM-EDS and XPS, and then the tribological mechanism was discussed. The results indicate that the modified nano-WS₂ has good stability in 150SN base oil. The lubricating oil containing nano-WS₂ exhibits better lubrication performance. In addition, when the nano-WS₂ content is the same, the anti-wear and friction reduction effect of the lubricating oil under DC magnetic field is better. The DC magnetic field had a certain aggregation effect on nano-WS₂ and could increase the possibility of tribochemical reaction.

Key words: nanoparticles, dispersion, attrition, DC magnetic field, WS₂, tribological properties, surface analysis

摘要：

在四球摩擦磨损实验机摩擦区域添加了直流磁场发生装置，研究了添加经修饰的纳米WS₂润滑油在直流磁场作用下的摩擦磨损性能，用扫描电镜（SEM）配合能谱仪（EDS）及X射线光电子能谱仪（XPS）对钢球磨斑区域表面形貌和典型元素的含量及化学状态进行了分析，并探讨了相关的摩擦学机理。实验结果表明：经修饰后的纳米WS₂在150SN基础油中稳定性良好，含纳米WS₂的润滑油体现出更好的润滑性能，在纳米WS₂含量相同时，直流磁场下的润滑油抗磨减摩效果更好。直流磁场对纳米WS₂有一定的聚集效应，并会提高摩擦化学反应发生的概率。

关键词: 纳米粒子, 分散, 磨损, 直流磁场, 二硫化钨, 摩擦学特性, 表面分析

CLC Number:

TH 117.3

Zichao JIANG, Jianhua FANG, Zeqi JIANG, Xin WANG, Yanhan FENG, Jianhua DING. Tribological properties ofnano-WS₂ lubricating oil additives under DC magnetic field[J]. CIESC Journal, 2019, 70(7): 2636-2644.

姜自超, 方建华, 江泽琦, 王鑫, 冯彦寒, 丁建华. 纳米WS₂润滑油添加剂在直流磁场下的摩擦磨损特性[J]. 化工学报, 2019, 70(7): 2636-2644.

Figures/Tables 9

Fig.1 Micrograph of nanoscale WS2 nanoparticles

Fig.2 Illustration of modified four-ball tribo-tester

Fig.3 Digital images of oil containing 2% nano-WS2 at different time

Fig.4 Transmittance of oil containing 2% nano-WS2 at different time recorded by UV-visible spectroscopy

Fig.5 Variation of wear scar diameter with mass fraction of WS2 nanoparticles under magnetic or non-magnetic field

Fig.6 Variation of friction coefficient with content of WS2 nanoparticles under magnetic or non-magnetic field

Fig.7 Variation of friction coefficient with test time of lubricants under magnetic and non-magnetic field

Fig.8 SEM micrographs and EDS analysis results of worn surfaces lubricated with oil doped 2.0% nano-WS2 under magnetic or non-magnetic field

Fig.9 XPS spectra of typical elements on worn surfaces lubricated with oil doped with 2.0% of WS2 nanoparticles under magnetic or non-magnetic field

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Tribological properties ofnano-WS₂ lubricating oil additives under DC magnetic field

纳米WS₂润滑油添加剂在直流磁场下的摩擦磨损特性

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Figures/Tables 9

References 31

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