INFLUENCE OF HIGH TEMPERATURE HEAT TREATMENT ON THE FRICTION PROPERTIES OF C/C COMPOSITE BRAKE MATERIALS

doi:10.19936/j.cnki.2096-8000.20210328.018

Abstract

Abstract: Graphitization degree is one of the most important parameters, which directly affects the friction and wear performance of C/C composite brake material. High temperature heat treatment is one of the important processes which would affect the graphitization degree of C/C composite brake materials. In this paper, C/C composite brake material is prepared by chemical vapor deposition (CVD) using 2.5D carbon fiber integral acupuncture felt as the reinforcement and natural gas as the air source. The friction performance of the aircraft was simulated under specific braking conditions with different high temperature treatment. The influence of annealing temperature on both graphitization degree and friction performance of C/C composite brake materials is discussed. It is revealed that pyrolytic carbon structure of C/C composite material which is prepared by chemical vapor deposition (CVD) is independent on annealing temperature. However, as annealing temperature raised to 2600 ℃, both the graphitization degree and heat conductivity coefficient of C/C composite brake material increased significantly. The friction coefficient of brake materials is inversely proportional to the brake pressure, unit area loading and velocity. Furthermore, the graphitization degree is proportional to friction coefficient and wear rate of brake materials.

Key words: C/C composite brake materials, graphitization degree, friction coefficient

CLC Number:

TB332

ZHOU Rui, HAN Wen-jing, SHI Wei-wei. INFLUENCE OF HIGH TEMPERATURE HEAT TREATMENT ON THE FRICTION PROPERTIES OF C/C COMPOSITE BRAKE MATERIALS[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(3): 112-116.

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