Chapter 16. Magnetoplumbite Compounds as a Fiber Coating in Oxide/Oxide Composites
- John B. Wachtman Jr.
Published Online: 28 MAR 2008
Copyright © 1994 The American Ceramic Society
Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5
How to Cite
Cinibulk, M. K. (2008) Magnetoplumbite Compounds as a Fiber Coating in Oxide/Oxide Composites, in Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314555.ch16
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1994
Print ISBN: 9780470375334
Online ISBN: 9780470314555
- fiber-matrix interfaces;
- oxidation resistance;
- sapphire fibers;
- chemical compatibility
Sol-derived CaAl12O19 (hibonite), a magnetoplumbite, was coated on sapphire fibers, which were subsequently consolidated in an Al2O3 or Y3Al5O12 matrix by hot-pressing. The loss of coating in the Al2O3-matrix composite resulted in growth of the fiber into the matrix. Doping of the matrix with CaO was necessary to maintain the coating during composite consolidation at 1550°C. Strong texturing in the 1—2 μm thick coating with basal planes oriented along the fiber axis was observed in the CaO-doped YAG-matrix composite. Observations by TEM suggest that hibonite with such a texture may deflect cracks along the easy-cleaving basal planes to protect the fiber.