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Improving Tribological Performance of Porous Polyimide by Surface Polishing AITranslate

Yang Yin; Pengfei Shi; Shaohua Zhang; Yuanyuan Jiang; Tao Qing; Yang Wang; Linmao Qian; Jiyang Zhang; Lei Chen;
Southwest Jiaotong University; Southwest Jiaotong University; Beijing Institute of Control Engineering; Southwest Jiaotong University; Beijing Institute of Control Engineering; Southwest Jiaotong University; Southwest Jiaotong University; Beijing Institute of Control Engineering; Southwest Jiaotong University
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Publisher: ACS
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Abstract AITranslate

Because of its self-lubricating qualities, porous polyimide (PPI) has been used as a crucial cage material for space bearings; however, overcoming the failure followed by blackening of PPI remains a challenge. Herein, we developed a surface smoothening approach to optimize the tribological performance of PPI in an oil-impregnated state. Pre-polishing using sandpaper and then with Al2O3 paste enables the fabrication of nanoscale rough PPI surfaces with significantly reduced friction and surface wear and complete suppression of the blackening phenomenon. Compared with polishing using sandpaper or Al2O3 paste, the compound polishing method created a substantially smoother surface. It exposed more polytetrafluoroethylene at the outermost surface, improving the liquid and solid lubrication properties of the contact interface under a mixed lubrication state. The further analysis indicated that decreasing the size of PPI surface pores during pre-polishing using sandpaper was crucial in resisting the adsorption of residual polishing particles.

KeyWords AITranslate

porous polyimide surface smoothening tribological performance blackening phenomenon mixed lubrication
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Basic Information:

DOI：https://doi.org/10.1021/acsapm.3c00795

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Citation Information:

Because of its self-lubricating qualities, porous polyimide (PPI) has been used as a crucial cage material for space bearings; however, overcoming the failure followed by blackening of PPI remains a challenge. Herein, we developed a surface smoothening approach to optimize the tribological performance of PPI in an oil-impregnated state. Pre-polishing using sandpaper and then with Al2O3 paste enables the fabrication of nanoscale rough PPI surfaces with significantly reduced friction and surface wear and complete suppression of the blackening phenomenon. Compared with polishing using sandpaper or Al2O3 paste, the compound polishing method created a substantially smoother surface. It exposed more polytetrafluoroethylene at the outermost surface, improving the liquid and solid lubrication properties of the contact interface under a mixed lubrication state. The further analysis indicated that decreasing the size of PPI surface pores during pre-polishing using sandpaper was crucial in resisting the adsorption of residual polishing particles.

quote

GB/T 7714-2015 [1] Yang Yin, Pengfei Shi, Shaohua Zhang, et al. ACS Applied Polymer Materials, 2023(5). DOI:10.1021/acsapm.3c00795.
MLA [1] Yang Yin, et al., ACS Applied Polymer Materials, no. 5, 2023, https://doi.org/10.1021/acsapm.3c00795.
APA [1] Yang Yin, Pengfei Shi, Shaohua Zhang, Yuanyuan Jiang, Tao Qing, Yang Wang, Linmao Qian, Jiyang Zhang, & Lei Chen. (2023). ACS Applied Polymer Materials(5). https://doi.org/10.1021/acsapm.3c00795
IEEE [1] Yang Yin, Pengfei Shi, Shaohua Zhang, Yuanyuan Jiang, Tao Qing, Yang Wang, Linmao Qian, Jiyang Zhang, and Lei Chen, ACS Applied Polymer Materials, no. 5, 2023, doi: 10.1021/acsapm.3c00795. keywords: {porous polyimide;surface smoothening;tribological performance;blackening phenomenon;mixed lubrication}