Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Tribological Characteristics of C/C-SiC-Cu Composite and Al/SiC Composite Materials under Various Contact Conditions

접촉 조건에 따른 C/C-SiC-Cu복합재와 Al/SiC복합재의 마모 특성에 관한 연구

  • 김병국 (연세대학교 기계공학부) ;
  • 신동갑 (연세대학교 기계공학부) ;
  • 김창래 (연세대학교 기계공학부) ;
  • 구병춘 (한국철도기술연구원 교통신기술연구실) ;
  • 김대은 (연세대학교 기계공학부)
  • Received : 2016.06.01
  • Accepted : 2016.10.03
  • Published : 2017.01.01
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Abstract

The surface temperature of disc brakes varies during braking, which can affect the friction and wear behavior of braking systems. In order to develop an efficient braking system, the friction and wear behaviors of brake materials need to be clearly understood. In this work, the friction and wear behavior of the C/C-SiC-Cu composite and the Al/SiC composite, which are used in disc braking systems, were investigated. Both the surface temperature and contact pressure were studied. A pin-on-reciprocating tribotester was used for this purpose, in order to control temperature and load. Results showed that the friction varied significantly with temperature and sliding distance. It was found that a transfer layer of compacted wear debris formed on the wear track of the two materials. These layers caused the surface roughness of the wear track to increase. The outcome of this work is expected to serve as a basis for the development of braking systems under various operating conditions.

디스크 브레이크의 온도는 제동 시 변할 수 있으며 이러한 표면 온도의 변화는 마찰/마모 특성에 영향을 줄 수 있다. 따라서 효율이 우수한 브레이크 개발을 위해서는 브레이크 소재의 마찰/마모 특성에 대한 이해가 필요하다. 본 연구에서는 디스크 브레이크 시스템에 사용되는 C/C-SiC-Cu복합재와 Al/SiC복합재에 대하여 표면 온도와 접촉압력에 따른 마찰/마모 특성을 비교하였다. 이를 위해 온도 및 하중조절이 가능한 pin-on-reciprocating방식의 마찰실험기를 사용하였다. 실험결과, 마찰은 온도와 거리에 따라 현저하게 변하였다. 또한 마모로 인하여 생성된 입자가 접촉 압력에 의해 표면에 뭉쳐져 transfer layer가 형성되었고, 표면 거칠기가 증가하였다. 이러한 연구 결과는 다양한 조건에서 작동하는 브레이크 시스템 개발을 위한 기초자료로 활용될 수 있을 것이다.

Keywords

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