Chapter 30. Effects of Air Leaks on the Phase Content, Microstructure, and Interfacial Behavior of CVD Zirconia on SiC Fiber

  1. Hua-Tay Lin and
  2. Mrityunjay Singh
  1. Hao Li,
  2. Jinil Lee and
  3. Woo Young Lee

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294741.ch30

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

How to Cite

Li, H., Lee, J. and Lee, W. Y. (2008) Effects of Air Leaks on the Phase Content, Microstructure, and Interfacial Behavior of CVD Zirconia on SiC Fiber, in 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3 (eds H.-T. Lin and M. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294741.ch30

Author Information

  1. Department of Chemical, Biochemical and Materials Engineering Stevens Institute of Technology, Hoboken, NJ 07030

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2002

ISBN Information

Print ISBN: 9780470375785

Online ISBN: 9780470294741

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Keywords:

  • nucleation;
  • chemical vapor deposition(CVD);
  • mechanism;
  • scanning electron microscope (SEM);
  • delamination

Summary

A slight increase in the rate of air leaks into the CVD-ZrO2 process appeared to mitigate the nucleation of tetragonal ZrOz phase. Without the nucleation of the tetragonal phase, the ZrO2 layer was well bonded to the Sic fiber surface and exhibitedno delamination at the fibedcoating interface region. This strong bonding at the fiberhating interface could significantly decrease, depending on the ZrO2 coating thickness, the tensile failure load of the coated Sic fiber tows. In contrast, ZrO2 coating specimens, produced at the lower air leak rates, contained the tetragonal ZrO2 phase. For these specimens, delamination occurred within the ZrO2 coating, and the coating did not decrease the fiber tow failure load. These results suggest that such a small change in the air leak rate could significantly change the nucleation behvior of ZrO2 and consequently its interfacial properties as a fiber coating for SiC/SiC composites.