Influence of filler-reinforced carbon fibers on the frictional properties of composite synchronizer rings

Abstract

This paper combines the processing of composite synchronizer ring and carbon fiber cloth pre-preg process to study the friction mechanism after adding filler in carbon fiber cloth of composite synchronizer ring, so as to improve the friction and wear performance of composite synchronizer ring. In order to increase the friction factor and thermal stability of composite synchronizer ring friction material two ways as an entry point, select the friction reducing filler in the good thermal conductivity of copper powder and friction increasing filler in the barite as the experimental filler in this paper. The results show that the friction temperature of the composite synchronizer ring without filler is higher and the wear is bigger, the composite synchronizer ring with barite as the filler is second, and the composite synchronizer ring with copper powder as the filler has the best effect of temperature reduction and wear reduction. In the shift force of 400 N, speed difference of 350 r/min, experimental time of 250 min conditions, adding copper powder to reduce the wear volume of about 10%, the friction coefficient is more stable average value decreased by about 0.02, only reduced by about 5%, which is better than the barite as a filler of 0.045; and from the surface quality of the composite synchronizer ring with copper powder as a filler the surface texture is clear. Still has a good oil storage and drainage capacity, can effectively improve the composite synchronizer ring wear resistance and service life. Barite as filler composite synchronizer ring initial friction coefficient is slightly higher, but the coefficient of friction decreased by about 20%, the composite synchronizer ring scratches and local carbon fiber shedding phenomenon, resulting in irreversible performance degradation.