Chapter 29. Oxidation Kinetics of Pure and Doped MgO-SiC Composites
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1995 The American Ceramic Society
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
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1995
Print ISBN: 9780470375389
Online ISBN: 9780470314784
- melting end;
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.