Abstract
The thermal expansion properties, dynamic mechanical properties and related tribological properties of polyetheretherketone (PEEK) composites filled with 0-25 wt.% content of calcium carbonate(CaCO3) whisker were investigated. The composite specimens were prepared by compression molding. Thermomechanical analysis (TMA) was performed to determine linear coeffcients of thermal expansion (CTE). Dynamic mechanical thermo-analysis (DMTA) was employed within the temperature range of 25–300°C. Tribological testing of composites in dry wear mode against carbon steel ring was carried out on a MM200 block-on-ring apparatus. All materials showed a large change in CTE at glass transition temperature(Tg), but CTEs of CaCO3/PEEK composites at temperatures below and above Tg were much lower than pure PEEK. For 25%CaCO3/PEEK the average CTE in a temperatures range of 25–120°C is about half lower than PEEK. CaCO3 whisker showed an significant effect on the dynamic stiffness at low and high temperatures. The increase of whisker content contributed to a rise to the storage modulus. CaCO3 whisker filled PEEK composites exhibited considerably lower friction coefficient and wear rate than pure PEEK. With an increase in CaCO3 whisker contents, coefficient of friction of PEEK composites continuously decreased,while the specific wear rate showed minima for l5% CaCO3 whisker inclusion with an approximate 7 times improvement in comparison with PEEK. The improved tribological performance of CaCO3/PEEK composites is ascribable to the effectiveness of the reinforcing CaCO3 whisker,which contributes to increase the thermal stability, stiffness and load-carrying capacity of PEEK composites in terms of counteracting the effects of thermal softening and adhesion.
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