Chapter 40. Processing, Microstructure, and Mechanical Properties of Zirconium Phosphate/Mullite-Whisker Composites

  1. John B. Wachtman Jr.
  1. Barry A. Bender,
  2. Roy J. Rayne and
  3. Todd L. Jessen

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314500.ch40

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4

How to Cite

Bender, B. A., Rayne, R. J. and Jessen, T. L. (1994) Processing, Microstructure, and Mechanical Properties of Zirconium Phosphate/Mullite-Whisker Composites, in Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314500.ch40

Author Information

  1. U.S. Naval Research Laboratory Washington, DC 20375-5320

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1994

ISBN Information

Print ISBN: 9780470375327

Online ISBN: 9780470314500

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Keywords:

  • hostile;
  • radomes;
  • intermittent;
  • stirring;
  • zirconium n-propoxide

Summary

ZrP2O7 composites are fabricated from liquid infiltration of mullite whisker-mats. The ZrP2O7 matrix is derived from a ZrO2-H3PO4 slurry, triisopropyl phoshpite, and zirconium n-propoxide. The development of a ZrO2-P2O5 precursor is monitored by thermogravimetric analysis (TGA), differential thermal analysis (DTA), and x-ray diffraction (XRD). Composites for mechanical testing are made using an optimized processing route to enhance infiltration and prevent fiber degradation. The composites are weak. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show that the composites are quite porous and that the mullite whiskers bond well to the matrix.