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Research Article | Open Access | Online First

Superlubrication of poly-α-olefin-8 (PAO8) enabled by MXene/PI coating

Peng WeiXin HouShimao HanXiangli WenXue ZhouYan MengLuo YueHui ZhaoGang WenHui CaoPengpeng BaiYu Tian( )
State Key Laboratory of Tribology in Advanced Equipment, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China

† Peng Wei and Xin Hou contributed equally to this work.

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Abstract

Polyimide (PI) coatings are highly valued for their easy processing and exceptional mechanical qualities, which enable them to be applied in a variety of approaches. By integrating MXene, a two-dimensional material renowned for its low shear strength and excellent load-bearing capacity, into the PI matrix and subsequently using it as a coating on GCr15 surfaces, MXene/PI composites were produced. The tribological performance of these composites improved with increasing MXene content and then decreased. In the dry state and lubricated with poly-α-olefin-8 (PAO8), the 0.25% MXene/PI composite demonstrated optimal tribological performance and achieved superlubricity, with a coefficient of friction (COF) of only 0.002 and a wear rate of only 1.92×10−7 mm3/(N·m). This improvement can be attributed to the even distribution of MXene in the PI matrix, particularly during frictional processes, as evidenced by scanning electron microscopy (SEM), dynamic mechanical analysis (DMA), and transmission electron microscopy (TEM) analyses. Furthermore, the interaction between MXene and PI was confirmed through X-ray photoelectron spectroscopy (XPS) analysis. These results not only establish the groundwork for developing high-performance PI coatings but also provide valuable insights for designing composite materials with superlubricity properties for engineering applications.

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Cite this article:
Wei P, Hou X, Han S, et al. Superlubrication of poly-α-olefin-8 (PAO8) enabled by MXene/PI coating. Friction, 2025, https://doi.org/10.26599/FRICT.2025.9440967

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Received: 09 April 2024
Revised: 11 June 2024
Accepted: 09 July 2024
Published: 06 January 2025
© The Author(s) 2025.

This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).

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