Effect of filler morphology on tribological performances of polyimide composites

Author： Yanjiang Song Peng Zhu Xiaodong Wang Pei Huang

ISSN： 0036-8792

Source： Industrial Lubrication and Tribology, Vol.62, Iss.2, 2010-01, pp. : 63-69

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Abstract

Purpose - The purpose of this paper is to provide some useful information on the tribological performance of thermoplastic polyimide (TPI) reinforced with rigid glass fillers of different shapes and sizes under dry, water, and oil lubrication conditions. Design/methodology/approach - Rigid glass fillers of different shapes and sizes are chosen to modify TPI and its mechanical properties are measured. The stress-strain behaviors of the composites are simulated by the finite element method and the effect of filler morphology is also considered. Furthermore, the tribological performance of the composites is investigated in different environmental media, including air, water, and oil. Findings - It is demonstrated that the toughness of the materials decreases on filling them with rigid glass, and that stress concentration causes cracks around the spherical glass beads, which reduces the material impact strength. Owing to heat moulding technology, glass fiber has certain orientation and absorbs the impact energy effectively. A better wear-resistant material is obtained by choosing a bigger filler due to its higher bond strength with the matrix. Under water and oil lubrication, the fatigue failure is the main reason for material wear, and fiber-reinforced TPI has favorable wear-resistance due to its shape. Meanwhile, glass beads could roll on the contact surface, which polishes the surface and reduces the friction coefficient, and its effect is reduced on oil lubrication for its high viscosity. Originality/value - This paper analyzes the effect of rigid glass fillers of different shapes and sizes on the mechanical properties and tribological performance of polyimide composites.