Chapter 72. Ceramic Matrix Composites Characterization with X-Ray Microtomography and Ultrasonics
- John B. Wachtman Jr.
Published Online: 28 MAR 2008
Copyright © 1993 The American Ceramic Society
Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 7/8
How to Cite
Baaklini, G. Y., Yancey, R. N. and Swickard, S. M. (1993) Ceramic Matrix Composites Characterization with X-Ray Microtomography and Ultrasonics, in Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314180.ch72
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1993
Print ISBN: 9780470375266
Online ISBN: 9780470314180
- tomographic system;
- mechanical behavior;
Capabilities and limitations of x-ray microtomography and ultrasonics in imaging matrix cracking, fiber layup, fiber-matrix debonding, fiber loading, and fiber pullout were defined. The composites consisted of unidirectional one-, three-, five-, and eight-ply specimens, and of a four-ply [0/90]s specimen of silicon carbide fiber reinforced reaction bonded silicon nitride matrix. Immersion ultrasonic pulse-echo was used with focussed broadband transducers up to 50 MHz center frequency. The tomographic system resolution was limited to 15 lp/mm (33 micrometers) at 10% modulation. Damage due to tensile failure was optically and radiographically evaluated. Photomicrographs and radiographs were used as references for establishing the microtomography and ultrasonics imaging capabilities. It was found that x-ray microtomography and relatively high frequency ultrasonics are viable nondestructive techniques for monitoring and assessing damage progression and mechanical behavior of newly-developed composites.