Chapter 20. Evaluation of SiC Platelets as a Reinforcement for Oxide Matrix Composites
- John B. Wachtman Jr
Published Online: 28 MAR 2008
Copyright © 1991 The American Ceramic Society, Inc.
Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 7/8
How to Cite
Baril, D. and Jain, M. K. (1991) Evaluation of SiC Platelets as a Reinforcement for Oxide Matrix Composites, in Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313831.ch20
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1991
Print ISBN: 9780470375099
Online ISBN: 9780470313831
Composites were fabricated using three sixes of SiC platelets and two sources of aluminas by wet mixing followed by hot pressing at 1500°C and 55 MPa pressure under argon atmosphere. Densities over 99% of the theoretical were obtained with up to 30 vol% loading. The microstructural studies of these composites showed uniform distribution of platelets with little or no porosity. Significant matrix grain growth was observed at low platelet loading irrespective of their size, whereas matrix cracks were observed in composites of larger platelets especially at high loading. The best combination of fracture toughness and flexural strength, 7.9 MPa✓m and 350 MPa, respectively, was obtained with the finest grade platelets with an average particle size of 11 microns. The predominant toughening mechanism was crack deflection caused by the platelets as well as matrix grains.