Study on Dependence of Friction Characteristics of Sintered Brake Friction Materials on Graphite Shape and Ratio with regard to Speeding up Rapid Transit System

This study aims to establish the fundamental basis for the design of materials used in high-speed trains, by using a lab-scale dynamometer to evaluate the characteristic behavior of metallic sintered friction materials in relation to the shape of graphite. The test results clearly demonstrate that when flake graphite and granular graphite are added equivalently, the average coefficient of friction is much lower, and it is less influenced by speed variation; moreover, friction wear is observed to be insignificantly low. Adding flake graphite increases the coefficient of friction, which leads to higher friction wear. In addition, the roughness of the disc surface was equivalent regardless of the shape of the graphite.

도시철도 고속화에 대비한 금속계 소결마찰재에서의 흑연 형상 및 비율에 따른 마찰특성 연구