Chapter 34. Mullite/Cordierite Laminates with β[RIGHTWARDS ARROW]α Cristobalite Transformation Weakened Interphases

  1. Don Bray
  1. Waltraud M. Kriven and
  2. Sang-Jin Lee

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294482.ch34

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 19, Issue 3

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 19, Issue 3

How to Cite

Kriven, W. M. and Lee, S.-J. (1988) Mullite/Cordierite Laminates with β[RIGHTWARDS ARROW]α Cristobalite Transformation Weakened Interphases, in 22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 19, Issue 3 (ed D. Bray), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294482.ch34

Author Information

  1. Department of Materials Science and Engineering University of Illinois at Urbana-Champaign Urbana, IL. 61801

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1988

ISBN Information

Print ISBN: 9780470375587

Online ISBN: 9780470294482

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Keywords:

  • cordierite;
  • cristobalite;
  • polymeric;
  • microcracking;
  • aluminum

Summary

Laminates of β-cristobalite and mullite/cordierite mixtures in 60:40 wt% respectively were tape cast and hot pressed. The β-cristobalite form, chemically stabilized with Ca2+ and Al3+ stuffing cations, was prepared by the solutionpolymerization route employing PVA solution as the polymeric carrier. The critical grain size of β-cristobalite for transformation and fracture behavior was investigated with laminates densified by hot-pressing at different thickness ratios between mullite/cordierite and β-cristobalite. The grain size was controlled by annealing at 1300 °C. A load-deflection curve for hot pressed samples annealed for 10 h showed a significant work of fracture (2.38 kJ/m2) with a strength of 131 MPa at the thickness ratio of cristobalite to the mullite/cordierite layer of 1:5. A low strength in spite of increasing work of fracture above a critical grain size of 4 μm was attributed to the crack deflection by microcracks in the transformation weakened cristobalite layer.