Effect of Aramid Fiber on Friction and Wear Properties of Brake Pads of Aluminum Matrix Composite Brake Discs
JI Yundong1,2, ZHANG Pengwei1, CUI Tangyin3, CAO Dongfeng2,4, HUANG Duanping1,*
1 School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China 2 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China 3 Shandong Industrial Ceramics Research and Design Institute Co., Ltd., Zibo 255000, Shandong, China 4 Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Foshan 528000, Guangdong, China
Abstract: The use of aluminum-based metal composite (AMMC) brake discs can reduce the weight of metro vehicles, but their heat resistance is poor, and the brake pads suitable for conventional cast iron brake discs cannot be directly applied to AMMC discs, so it is necessary to develop matching brake pads. Aramid fibers have the advantages of better heat resistance and abrasion resistance, and the incorporation of aramid fibers into brake pads may improve their friction performance at high temperatures. In this work, a resin-based brake pad material matched with AMMC brake disc was developed, and the effects of pressure, speed and temperature on the friction and wear properties of brake AMMC disc with diffe-rent aramid content were studied. The results showed that aramid fiber promoted the formation of afriction layer and improved its strength. The friction interface contact form changed from point contact to surface contact after adding aramid fibers, which reduced the sensitivity of the friction coefficient of the brake pad to pressure change and the maximum temperature of the brake pad surface, inhibited the material transfer of the AMMC disc, and protected the surface integrity of the brake pad and brake disc.
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2025, Vol. 39 
