Chapter 43. R. Curve Behavior in SiC-TiB2
- John B. Wachtman Jr.
Published Online: 28 MAR 2008
Copyright © 1989 The American Ceramic Society, Inc.
A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 9/10
How to Cite
Magley, D. J. and Faber, K. T. (1989) R. Curve Behavior in SiC-TiB2, in A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470310588.ch43
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1989
Print ISBN: 9780470374870
Online ISBN: 9780470310588
- static fatigue behavior;
- ceramic materials;
- yttria-stabilized tetragonal zirconia polycrystals;
- fracture toughness;
- fatigue resistance
Composites of SiC-TiB2 demonstrate significant toughnesses over and above monolithic SiC, although the specific toughening mechanisms which give rise to this toughness enhancement have not been identified. Crack deflection mechanisms are speculated to be the source of the toughness. However, new evidence by Garnier et a demonstrates microcracking of the TiB2-SiC grain boundaries. To test the microcrack toughening theory, we have measured the fracture resistance as a function of crack length (R-curve) of a series of SiC-TiB2 materials where both the concentration and location of TiB2 have been varied. Residual stress measurements by x-ray diffraction have also been performed. The results are compared to recent toughness models.