Chapter 13. 3-D Composite Fabrication Through Matrix Slurry Pressure Infiltration

  1. John B. Wachtman Jr.
  1. Edmund H. Moore1,
  2. Tai-Il Mah2 and
  3. Kristin A. Keller2

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314500.ch13

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

Moore, E. H., Mah, T.-I. and Keller, K. A. (1994) 3-D Composite Fabrication Through Matrix Slurry Pressure Infiltration, 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.ch13

Author Information

  1. 1

    WL/MLLN, Wright-Patterson Air Force Base WPAFB OH 45433-7817

  2. 2

    UES Inc., Dayton OH 45432

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:

  • infiltration;
  • atmosphere;
  • interfacial;
  • interlock;
  • oven-dried

Summary

The potential application of the fugitive interracial coating concept for 3-D Nextel™ 440/a-alumina composites was investigated. A fugitive carbon coating was applied to the fiber preform by chemical vapor deposition (CVD). Composites were subsequently fabricated using a slurry pressure infiltration (PI) technique. Multiple slurry PI steps with fractionated alumina slurry, followed by multiple vacuum impregnation (VI) steps with a fine alumina sol, were used to increase the composite green density. Various drying techniques were studied in order to minimize shrinkage cracks due to drying. Partial sintering in an inert atmosphere was performed, in some cases, between multiple infiltration steps. Bulk properties (i.e., density, porosity and packing density) and microstructural (electron microscopy) observations of the composites will be presented. Several issues (i.e., carbon coating retention, freeze drying, alumina particle size and infiltration cycles) regarding 3-D composite processing with PI will be discussed.