Optimization of weave of carbon fabric for best combination of strength and tribo-performance of polyetherimide composites in adhesive wear mode

Studies are focused on the composites using carbon fabric (CF) as a reinforcement and high performance thermoplastic polyetherimide (PEI) as a matrix. Based on impregnation technique three composites viz. P, T and S were fabricated using three different weaves viz. plain (P'), twill (T') and satin 4H (S'), respectively, keeping the fabric content constant (55% by vol.). Apart from evaluating physical and mechanical properties of these composites, friction and wear performance in dry adhesive wear mode was investigated on a pin-on-disc machine under various loads at room temperature as well as at high temperature (90 degrees C) against mild steel disc. It was observed that the CF reinforcement proved significantly beneficial for enhancing strength and modulus properties. These properties of the composites followed the order; T >> S > P while friction and wear performance followed an order; T > P > S. Thus, twill weave proved to be the most suitable for best possible combination of strength, modulus and tribo-performance. SEM studies on worn pin surfaces proved helpful in understanding wear mechanisms. (C) 2007 Published by Elsevier B.V.