Chapter 25. Spark-Erosion Process Effects on the Properties and Performance of a Tib2 Particulate-Reinforced/SiC Matrix Ceramic Composite

  1. J. P. Singh
  1. M. Ramulu,
  2. M. G. Jenkins and
  3. J. A. Daigneault

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch25

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

How to Cite

Ramulu, M., Jenkins, M. G. and Daigneault, J. A. (1997) Spark-Erosion Process Effects on the Properties and Performance of a Tib2 Particulate-Reinforced/SiC Matrix Ceramic Composite, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294437.ch25

Author Information

  1. Department of Mechanical Engineering University of Washington Seattle, WA 98195

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1997

ISBN Information

Print ISBN: 9780470375495

Online ISBN: 9780470294437

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Keywords:

  • ceramic composite;
  • spark-erosion process;
  • flexural strengths;
  • resolidification;
  • surface roughness

Summary

The effects of a spark-erosion process, namely die-sinker electro-discharge machining (EDM), on the surface finish and flexural strength of a commercial TiB2 particulate-reinforced/SiC matrix ceramic composite were investigated. Conventional surface profiles were recorded and the average surface roughness parameters were determined. Average surface roughness of the 'fine' machining condition of EDM (Ra=2.26 micrometre) was found to be rougher than a diamond-ground (400 grit) surface (Ra=0–1 micrometre). Flexural strengths distributions were obtained at three EDM conditions. Weibull analyses employing biased maximum likelihood estimators showed the greatest flexural strengths for diamond-grit grinding which decreased surface damage. As-machined and fractured surfaces were examined by SEM, revealing wide-spread melting/resolidification of both matrix and reinforcement materials at the coarse EDM condition. It was found that flexural strength decreases with increasing surface roughness and decreases with increasing crack density and severity.