Chemical Industry and Engineering Progress ›› 2023, Vol. 42 ›› Issue (9): 4783-4790.DOI: 10.16085/j.issn.1000-6613.2022-1908

• Materials science and technology • Previous Articles     Next Articles

Controllable and large-scale preparation of two-dimensional WS2 nanosheet and its tribological properties as lubricant additives in lithium grease

XIANG Shuo1(), LU Peng1(), SHI Weinian2, YANG Xin1, HE Yan1, ZHU Liye3, KONG Xiangwei4   

  1. 1.Oil and Lubricant Department, Army Logistics Academy, Chongqing 401311, China
    2.Unit 96725 of PLA, Honghe Hani and Yi Autonomous Prefecture 651400, Yunnan, China
    3.Chengdu Quality Supervision Station of PLA,Chengdu 610000, Sichuan, China
    4.Naval Aeronautical University, Yantai 264000, Shandong, China
  • Received:2022-10-14 Revised:2022-11-16 Online:2023-09-28 Published:2023-09-15
  • Contact: LU Peng

二维WS2纳米片的规模化可控制备及其摩擦学性能

向硕1(), 卢鹏1(), 石伟年2, 杨鑫1, 何燕1, 朱立业3, 孔祥微4   

  1. 1.陆军勤务学院油料系,重庆 401311
    2.96725部队,云南 红河哈尼族彝族自治州 651400
    3.中国人民解放军 成都质量监督站, 四川 成都 610000
    4.海军航空大学,山东 烟台 264000
  • 通讯作者: 卢鹏
  • 作者简介:向硕(1986—),男,博士,讲师,研究方向为二维润滑材料。E-mail:xslaplace@163.com
  • 基金资助:
    国家自然基金青年基金(51704301);重庆市自然科学基金(cstc2019jcyj-msxmX0453)

Abstract:

A sonication-assisted liquid phase exfoliation method was demonstrated based on liquid cascade centrifugation and freeze-drying method, which was designed to prepare two-dimensional WS2 nanosheet. X-ray diffraction (XRD), Raman, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and thermogravimetric and differential scanning calorimetry (TG-DSC) analyses were used to examine the morphology of two-dimensional WS2 nanosheets and crystalline structures as well as their thermal stability. A four ball tribometer was used to characterize the extreme pressure, friction-reducing and anti-wear properties of lithium grease containing two-dimensional WS2 nanosheets, and the wear scar of steel balls were observed under SEM. The results showed that the controllable and large-scale preparation of two-dimensional WS2 nanosheet was achieved, and the prepared samples possessed consistent crystal form and lattice as well as good thermal stability. The tribological properties of all of the lithium grease containing two-dimensional WS2 nanosheets were improved in comparison with lithium-based grease. Furthermore, 2.0% of WS2-3 (as the optimal concentration) in comparison with lithium-based grease, improved the PB and PD values by 63.3% and 86.1%, and reduced friction coefficient and wear scar diameter by 19.3% and 34%, respectively.

Key words: two-dimensional WS2 nanosheet, sonication-assisted liquid phase exfoliation, liquid cascade centrifugation, lubricating additive, tribological properties

摘要:

以微米级WS2为原料、异丙醇为剥离介质,通过超声辅助液相剥离、液相级联离心和固液分离的策略制备二维WS2纳米片,采用X射线衍射仪、拉曼光谱仪、扫描电子显微镜、透射电子显微镜、热重-差示扫描量热联用分析仪等对二维WS2纳米片的微观结构、形貌和热稳定性进行表征。借助四球摩擦磨损试验机考察二维WS2纳米片作为锂基润滑脂添加剂的极压、减摩和抗磨性能,利用电子显微镜对钢球磨斑表面进行分析。结果表明,实现了不同片径二维WS2纳米片的规模化制备,且所制备的样品晶型无破坏、晶格完整,具有较好的热稳定性;二维WS2纳米片的片径对锂基润滑脂的摩擦学性能有显著影响,随着片径减小,其极压、减摩和抗磨性能均明显提升;当WS2-3纳米片质量分数添加量为2.0%时,最大无卡咬负荷和烧结负荷较锂基脂分别提升63.3%和86.1%,摩擦系数和磨斑直径减小19.3%和34%。

关键词: 二维WS2纳米片, 超声辅助液相剥离, 液相级联离心, 润滑添加剂, 摩擦学性能

CLC Number: 

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