Chapter 52. Grain Size Dependence of Wear in Ceramics

  1. William Smothers
  1. C. Cm. Wu,
  2. R. W. Rice,
  3. D. Johnson and
  4. B. A. Platt

Published Online: 26 MAR 2008

DOI: 10.1002/9780470320280.ch52

Proceedings of the 9th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 6, Issue 7/8

Proceedings of the 9th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 6, Issue 7/8

How to Cite

Wu, C. Cm., Rice, R. W., Johnson, D. and Platt, B. A. (1985) Grain Size Dependence of Wear in Ceramics, in Proceedings of the 9th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 6, Issue 7/8 (ed W. Smothers), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470320280.ch52

Author Information

  1. Naval Research Lab Washington, DC 20375–5000

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1985

ISBN Information

Print ISBN: 9780470374337

Online ISBN: 9780470320280

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Keywords:

  • extrapolation;
  • grain-size;
  • POD;
  • expansion anisotropy;
  • macrowear

Summary

Pin-on-disk (POD), microwear tests of Al2O3, MgO, MgAl2O4 and ZrO2, most being dense and essentially single phase, showed the reciprocal of wear following a Hall-Petch type relationship. However, extrapolation to infinite grain size always gave a lower intercept than most or all single-crystal values; in particular, Al2O3 data projects to a negative intercept. Initial macro wear tests of some of the same Al2O3 materials also indicate a Hall-Petch type grain-size dependence, but with a greatly reduced grain-size dependence, giving a positive Hall-Petch intercept. Further, the macrowear grain-size dependence appears to decrease with increased wear. It is argued that thermal expansion anisotropy (of Al2O3) significantly affects the grain size dependence of POD wear, in particular, giving a negative intercept, while elastic anisotropy is suggested as a factor in the grain-size dependence of the cubic (MgO, MgAl2O4, and ZrO2) materials. The reduced grain-size dependence in the macrowear tests is attributed to overlapping wear tracks reducing the effects of enhanced wear damage, e.g., from elastic and thermal expansion anisotropies.