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Research Article | Open Access

Comparative study of tribological properties of insulated and conductive polyimide composites

Jingfu SONG1, Yuanhao YU2, Gai ZHAO2(), Jinhao QIU2(), Qingjun DING2
College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
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Abstract

Insulated polyimide (PI) composites filled with short glass fibers (SGF), polytetrafluoroethylene (PTFE), SiO2, and polyphenylene (PPL) are specially designed, prepared, and the tribological properties are systematically investigated with references to the special requirements for frictional materials used in ultrasonic motors. The hardness and thermal decomposition temperature of the insulated PI composites are comparable to that of conductive PI composites. However, these insulated materials present excellent friction and wear performance, especially under high loads and speeds. Scanning electron microscopy (SEM) analysis of the worn surface indicates that adhesive and fatigue wear dominate the wear mechanisms.

Keywords

polyimide compositesinsulationfrictionwear

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Friction
Volume 8 Issue 3,
June 2020
Pages 507-516
DOI: 10.1007/s40544-019-0269-3
Cite this article:
SONG J, YU Y, ZHAO G, et al. Comparative study of tribological properties of insulated and conductive polyimide composites. Friction, 2020, 8(3): 507-516. https://doi.org/10.1007/s40544-019-0269-3
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10.1007/s40544-019-0269-3.T001Compositions of the tribo-materials. (vol.%)

SamplePISCFSGFGraphitePTFESiO2PPL
PI-16915—10—15
PI-269—15—1015
FunctionMatrixReinforceReinforceLubricantsLubricants + low surface energyFortifierThermal stability

10.1007/s40544-019-0269-3.T002Some main parameters of PI composites.

SampleTensile strength (MPa)Elongation percentage (%)Elastic modulus (GPa)Electrical resistance
PI-1273.45.313.47300 Ω-400 Ω
PI-2225.26.29.23∝