Chapter 63. Oxide CMCs; Novel Fibres, Coatings and Fabrication Procedures

  1. Todd Jessen and
  2. Ersan Ustundag
  1. M. H. Lewis1,
  2. S. York1,
  3. I. Al-Dawery2,
  4. E. G. Butler2,
  5. C. Freeman3,
  6. I. C. Alexander3 and
  7. P. A. Doleman4

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294628.ch63

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3

How to Cite

Lewis, M. H., York, S., Al-Dawery, I., Butler, E. G., Freeman, C., Alexander, I. C. and Doleman, P. A. (2000) Oxide CMCs; Novel Fibres, Coatings and Fabrication Procedures, in 24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3 (eds T. Jessen and E. Ustundag), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294628.ch63

Author Information

  1. 1

    Centre for Advanced Materials University of Warwick Coventry, CV4 7AL, UK

  2. 2

    IRC in Materials for High Performance Applications University of Birmingham, B15 2TT, UK

  3. 3

    Morgan Materials Technology Worcs., EY13 8QR, UK

  4. 4

    Rolls-Royce plc Derby, DE24 8BJ, UK

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2000

ISBN Information

Print ISBN: 9780470375686

Online ISBN: 9780470294628

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Keywords:

  • fiber-reinforced ceramic composites;
  • tensile properties;
  • multifilament tows;
  • ceramic fibers;
  • fiber tensile

Summary

A review is presented of components of an interdisciplinary project on oxide CMC development for high temperature applications.

Novel mullite fibres produced on a laboratory scale by pyrolysis of sol-spun mixed precursors, have nanometre grain size, stabilised by in-situ precipitation of additive oxides. The reactions during evolution of the stoichiometric (3Al2O3 2SiO2), orthorhombic mullite crystals have been traced with MASNMR spectroscopy and X-ray diffraction. The fibres have tensile strengths up to 2.9 GPa and microstructural stability to >1300°C with creep rates, measured using BSR tests, which are lower than existing commercial fibres (e.g. 3M 720)

Debond coatings have been studied for alumina and mullite fibres, using liquid and vapour deposition, based on non-reactive oxides, phosphates or vanadates.

Prototype CMCs have been fabricated using pressure-infiltration of oxide matrices into woven preforms of 3M-720 fibres. Tensile data has been measured on specimens diamond-machined from pressureless-sintered tiles.