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| Braking behaviors of Cu-based powder metallurgy brake pads mated with
different discs for high-speed train |
| ZHAO Sanqing，YAN Qingzhi，PENG Tao |
| School of Material Science and Engineering，University of Science and Technology Beijing，
Beijing 100083，China |
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Abstract Stable braking and lightening of unsprung mass are the development direction of high-speed train braking
systems. Carbon ceramic materials（C/C-SiC）have been used in advanced braking systems such as high-end
cars and airplanes due to light weight，appropriate toughness，and high thermostability. However，its application
in high-speed train needs to be estimated. In this study，powder metallurgy brake pads，steel brake disc，and C/CSiC
brake disc were used. The brake tests were performed at initial braking speeds of 80，120，160，200，250，
300，320，350，380 km/h. The results show that the powder metallurgy pad and C/C-SiC disc displayed higher
friction coefficient，and higher friction stability. The friction coefficient stability factor is 0.908 for the ceramic
disc group，which is higher than the corresponding value of steel disc，0.895. The wear test shows that the wear
rate of the brake pad mated with the ceramic disc is up to 0.147 cm3/MJ，while the wear rate of the pad with the
steel disc is 0.338 cm3/MJ，which is 2.3 times that of the ceramic group. When mated with C/C-SiC ceramic disc，
the surface is slightly damaged after high-speed braking. Maintaining a stable friction area，the friction coefficient
is stable as well. Meanwhile，transferred material on the ceramic disc is less，resulting in lower wear rate. According
to the results，the application of C/C-SiC ceramic brake discs to high-speed braking systems shows significant
advantages.
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Received: 20 March 2020
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2021, Vol. 31 
