Chapter 63. Oxide CMCs; Novel Fibres, Coatings and Fabrication Procedures
- Todd Jessen and
- Ersan Ustundag
Published Online: 26 MAR 2008
Copyright © 2000 The American Ceramic Society
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
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 2000
Print ISBN: 9780470375686
Online ISBN: 9780470294628
- fiber-reinforced ceramic composites;
- tensile properties;
- multifilament tows;
- ceramic fibers;
- fiber tensile
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.