Abstract：CaSO4 whisker reinforced resin-based composite friction materials(sample A) were prepared by thermo-compression process, and a commercial brake material(sample B) was selected as a reference. The influence of braking frequency on the tribological performance of samples was investigated by CHASE tester. The SEM and EDAX were used to observe the wear surface morphology and the composition of the surface of films respectively, and the influence mechanism of braking frequency on wear mechanism of samples was analyzed. The results show that CaSO4 whisker has played a significant toughening and strengthening effects on sample A, the average friction coefficient of sample A always maintains at a high level of around 0.48 and exhibits stable and reliable braking performance with the change of braking frequency. Moreover, the damage degree of dual disc is lighter, and the main wear mechanism is abrasive wear. While the friction coefficient of sample B decreases firstly and then increases, and shows sensitive to the change of braking velocity, as well as its main wear mechanism is adhesive wear and oxidation wear. The friction surface temperature and mass wear rate of samples are increased with increasing of braking frequency, but both materials show good wear resistance when the braking frequency less than 35 times.
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