Chapter 9. Mechanical Behavior of Silicon Carbide Particulate Reinforced Reaction Bonded Silicon Nitride Matrlx Composites
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1992 The American Ceramic Society
Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 7/8
How to Cite
Nair, S. V., Cai, P. Z. Q. and Ritter, J. E. (1994) Mechanical Behavior of Silicon Carbide Particulate Reinforced Reaction Bonded Silicon Nitride Matrlx Composites, in Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313954.ch9
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1994
Print ISBN: 9780470375174
Online ISBN: 9780470313954
SiC particulate reinforced reaction bonded Si3N4 composites were made by colloidally pressing samples from octanol dispersions of commercial SiC particles with 0.2–0.3μm diameter, high purity Si powders made from SiH4 gas. SiC volume fractions in the range of 20–38vol% were selected with two particle sizes of 15 and 50μm. As-processed strengths of the particulate reinforced composites were determined in a ball-on-ring test. Fracture toughness and R-curve behavior of each composite type were measured by loading indented 3-point-bend bars to failure. Significant toughening was observed for both SiC particle sizes; however, strength degradation occurred in the 50μm SiC (p) composite. This toughening appears to be due to crack bridging and microcracking of the SiC particles in advance of the propagating crack.