Development and Testing of Pad for Brake Disc of Aluminum Matrix Composites

Abstract:

To develop pad matching for brake disc of SiCp/Al composite, two formulas of metal series and ceramic series were designed. Pads were formed respectively by using the conventional and the microporous forming processes. Sample inertia subscale test, constant speed friction test, full-scale rig test and noise test were conducted. The results show that the average friction coefficient in emergency braking, service braking, and track simulation braking, and the static friction coefficient of J65217c pad by using the microporous forming process can meet the requirements of urban rail vehicle. The wear of J65217c pad is 0.58 cm3?MJ-1, and its noise in service braking is 79.3 to 93.4 dB(A).The maximum temperature of disc in the whole braking process is much lower than 400 ℃.In addition, the fluctuation of friction coefficient and wear of pad can be decreased effectively by reducing metal filler while adding ceramic filler. The wear of pad forming by using the conventional process is slightly lower than that of the pad forming by using the microporous process. Negative slope of friction coefficientspeed curve and porosity guaranteed by the microporous process are beneficial for reducing braking noise. As the braking force increases, the noise increases. The fluctuation of friction coefficient of subscale sample is smaller than that of fullscale pad.