29. The Tribological Property Effects of Graphite within a Composite Pad-Cast Iron Braking System

  1. Edgar Lara-Curzio and
  2. Michael J. Readey
  1. Séverine Ramousse

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291191.ch29

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

How to Cite

Ramousse, S. (2004) The Tribological Property Effects of Graphite within a Composite Pad-Cast Iron Braking System, in 28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4 (eds E. Lara-Curzio and M. J. Readey), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291191.ch29

Author Information

  1. Risø National Laboratory - Materials Research Department P. O. Box 49 4000 Roskilde, Denmark

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2004

ISBN Information

Print ISBN: 9780470051528

Online ISBN: 9780470291191

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Keywords:

  • friction materials;
  • optical microscopy;
  • lamellar graphite particles;
  • hydrogen;
  • graphite

Summary

The aim of this work is to understand the effect of graphite on the tribological properties of semi-metallic friction materials, about which no directly relevant literature could be found. Tribological properties have been observed as a function of graphite content by altering the graphite/coal ratio. As coal has a relatively limited effect on the tribology, the effect of graphite can be extracted by maintaining a constant total carbon content. The tribological properties were evaluated using a dynamometer, hardness and wear were also measured. SEM was performed on disc cross-sections and worn disc surfaces. It was concluded that graphite has a direct impact on the disc third body thickness, appearance and therefore, on the wear and the friction coefficient in semi-metallic friction materials. This observation was found to be different to other friction systems. An optimum graphite/coal ratio of 16/24 was found for the friction matrix used.