Research on the friction characteristics and thermal capacity of C/C-SiC composite materials applied to the friction blocks for 600 km/h maglev train

doi:10.19936/j.cnki.2096-8000.20250828.013

Abstract

Abstract: C/C-SiC composite materials have been used as skid shoes and have operated safely at 430 km/h on the Shanghai High-Speed Maglev Demonstration Line for nearly 20 years. With the advent of 600 km/h high-speed maglev trains, it is urgent to investigate the friction characteristics and thermal capacity analysis of C/C-SiC composite material friction blocks for application in 600 km/h maglev trains. This paper first obtains the friction coefficient and temperature rise characteristics of the C/C-SiC composite material through 600 km/h high-speed friction tests. Under the test conditions of 600 km/h, a Z-direction pressure of 4 kN, and continuous friction for 8 min, the highest temperature recorded by the sensor reached 569.2 ℃ and tended to stabilize, which is far below the material’s allowable temperature limit. The average friction coefficient is below 0.1, meeting the technical requirement of minimizing the friction coefficient in high-speed friction environments. Using a thermal capacity simulation calculation method to replicate the high-speed friction test temperatures, the distribution coefficient of the friction heat flux density between the C/C-SiC composite material and the rail wheel is determined to be 0.020 54. Based on this parameter, the simulation predicts the temperature characteristics of the C/C-SiC composite material when it drags at 600 km/h for 300 km in the event of a suspension failure in the high-speed maglev train, providing support for the design optimization and engineering application of 600 km/h high-speed maglev trains.

Key words: C/C-SiC composite materials, 600 km/h maglev train, friction characteristics, thermal capacity

CLC Number:

TB332

LIU Peng, LI Yang, YUAN Yuqing, LI Pengtao, YUAN Minge, ZHANG Jinyu, ZHENG Yong, XIAO Peng. Research on the friction characteristics and thermal capacity of C/C-SiC composite materials applied to the friction blocks for 600 km/h maglev train[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(8): 111-117.

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