Synergistic modification of the tribological properties of polytetrafluoroethylene with polyimide and boron nitride

Chaojie Xie; Kejian WANG

doi:10.1007/s40544-020-0431-y

Friction 2021, 9(6): 1474-1491 https://doi.org/10.1007/s40544-020-0431-y

Research Article |

Open Access | Issue | Published: 29 October 2020

Synergistic modification of the tribological properties of polytetrafluoroethylene with polyimide and boron nitride

Show Author's Information Hide Author's Information Chaojie Xie, Kejian WANG(

)

College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Keywords:

wear mechanism, coefficient of friction (COF), transition map, polytetrafluoroethylene (PTFE), polyimide (PI), boron nitride(BN)

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Xie C, WANG K. Synergistic modification of the tribological properties of polytetrafluoroethylene with polyimide and boron nitride. Friction, 2021, 9(6): 1474-1491. https://doi.org/10.1007/s40544-020-0431-y

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Abstract

Polytetrafluoroethylene (PTFE) blended with polyimide (PI) and filled with boron nitride (BN) is prepared through cold pressing and sintering for composites with remarkable wear resistance and reduced coefficient of friction (COF). The characterizations show that BN and PI at different levels, improve the hardness, dynamic thermo-mechanical modulus, thermal conductivity, and tribological properties of PTFE. PI boosts the dispersion and bonding of BN in PTFE. In dry sliding friction of a block-on-ring tribometer, the wear rate and COF of 10:10:80 BN/PI/PTFE reduce to almost 1/300 and 80% of those of pure PTFE, respectively, as the wear mechanism transition from being adhesive to partially abrasive. This occurs only when the additives BN and PI induce a synergistic effect, that is, at concentrations that are not higher than ca. 10 wt% and 15 wt%, respectively. The obvious agglomeration at high percentages of added PI and severe conditions (400 N and 400 rpm) induce strong adhesive failure. The variations in the tensile properties, hardness, crystallization, and microstructure of the composites correspond to different effects. The multiple parameters of the plots of wear and friction are transformed into their contour curves. The mechanism transition maps aid in understanding the influence of various test conditions and composite compositions on the contact surfaces in the space-time framework of wear.

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Synergistic modification of the tribological properties of polytetrafluoroethylene with polyimide and boron nitride

Show Author's information Hide Author's Information Chaojie Xie, Kejian WANG(

)

College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Abstract

Keywords: wear mechanism, coefficient of friction (COF), transition map, polytetrafluoroethylene (PTFE), polyimide (PI), boron nitride(BN)

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Publication history

Received: 29 April 2020

Revised: 01 July 2020

Accepted: 11 July 2020

Published: 29 October 2020

Issue date: December 2021

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 51073021).

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