Chapter 29. Oxidation Kinetics of Pure and Doped MgO-SiC Composites

  1. John B. Wachtman Jr.
  1. M. E. F. Carney and
  2. D. W. Readey

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314784.ch29

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5

How to Cite

Carney, M. E. F. and Readey, D. W. (1995) Oxidation Kinetics of Pure and Doped MgO-SiC Composites, in Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314784.ch29

Author Information

  1. Colorado Center for Advanced Ceramics Colorado School of Mines Golden, CO 80401

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1995

ISBN Information

Print ISBN: 9780470375389

Online ISBN: 9780470314784

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Keywords:

  • melting end;
  • qualitative;
  • accumulated;
  • consumption;
  • inaccessibility

Summary

The oxidation kinetics of SiC particulate-reinforced MgO composites have been studied. The rate of growth of the oxidized layer and the changes in microstructure that occur suggest that Mg2+ diffusion is the rate-controlling step. To confirm that magnesium diffusion is rate controlling, SiC-reinforced MgO doped with scandium was oxidized under similar conditions. Sc2O3-doping increased the rate of oxidation as expected compared to the pure reinforced MgO. Oxidation in O2 confirms the mechanism as does the formation of an oriented large-grain surface layer.