Development of Brake Disk Materials with Ni-Cr-Mo

Ni-Cr-Mo계 제동디스크 소재 개발

  • 구병춘 (한국철도기술연구원 철도시스템연구본부) ;
  • 임충환 (한국철도기술연구원 연구원/UST)
  • Published : 2008.04.30

Abstract

Brake disks for rolling stock are exposed to thermal fatigue during braking, and thermal cracks occur on surface of disks. Thermal cracks can cause serious accidents, deterioration of braking performance and increase of maintenance cost due to frequent exchange of friction materials. In this study, candidate materials with high-heat resistance were selected by searching the literature. By using cast specimens made of the candidate materials, chemical composition, crystal structure and graphite type were analyzed. In addition, friction coefficient and wear were measured and compared with values for the disk material in service. As a result, it was shown that the NiCrMo has highest tensile strength and lowest friction coefficient and the disk material in service has the most stable friction characteristics.

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