Chapter 31. Isotropic Complex Oxides as Fiber Coatings for Oxide-Oxide CFCC

  1. J. P. Singh
  1. Richard W. Goettler1,
  2. Sankar Sambasivan2 and
  3. Vinayak P. Dravid3

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch31

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

How to Cite

Goettler, R. W., Sambasivan, S. and Dravid, V. P. (1997) Isotropic Complex Oxides as Fiber Coatings for Oxide-Oxide CFCC, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294437.ch31

Author Information

  1. 1

    Babcock & Wilcox, Lynchburg Research Center P.O. Box 11165 Lynchburg, VA 24506–1165

  2. 2

    BIRL/Northwestern University 1801 Maple Ave. Evanston, IL 60201–3140

  3. 3

    Northwestern University Dept. Of Materials Science and Engineering Evanston, IL 60208

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1997

ISBN Information

Print ISBN: 9780470375495

Online ISBN: 9780470294437

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Keywords:

  • isotropic oxides;
  • fiber reinforced ceramic composites;
  • non-wetting characteristics;
  • fiber coatings;
  • boiler components

Summary

Classes of complex isotropic oxides consisting of tungstates, molybdates, tantalates and niobates with the general chemical formula ABO4 are being considered as fiber coatings for oxide-oxide continuous fiber reinforced ceramic composites (CFCC). Initial investigations were performed with scheelite (CaWO4) and erbium tantalate (ErTaO4) coatings on Nextel™ 610 alumina fibers. Scheelite appears to show no reactivity with alumina at temperatures up to 1450°C. The scheelite-alumina interface exhibits non-wetting characteristics and easy debonding. Unidirectional Nextel 610° composites containing scheelite fiber coatings exhibited extensive fiber pullout. Preliminary results with ErTaO4 indicate a well bonded interface with alumina, however, detailed characterization of the interface is still pending.