Chapter 44. Performance of Blackglas™ Composites in 4000-Hour Oxidation Study
- John B. Wachtman Jr.
Published Online: 28 MAR 2008
Copyright © 1996 The American Ceramic Society
Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 17, Issue 4
How to Cite
Campbell, S., Gonczy, S., McNallan, M. and Cox, A. (2008) Performance of Blackglas™ Composites in 4000-Hour Oxidation Study, in Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 17, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314876.ch44
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1996
Print ISBN: 9780470375433
Online ISBN: 9780470314876
- flowing dry air;
- 3-point flexure analysis;
- original flexure strength;
- optical microscopy;
The effect of long term (4000 hour) oxidation on the mechanical properties of Blackglas™-Nitrided Nextel™ 312 Ceramic Matrix Composites in the temperature range of 500°–700°C was investigated. Flexure specimens of the title composites were prepared using three different pyrolysis processes were subjected to oxidation in flowing dry air at 500°, 600°C, and 700°C. Samples were removed at several different time intervals for 3-point flexure analysis. Results indicate that processing conditions had very little effect on the oxidation resistance of this system. At 600° and 700°C the mechanical properties degrade continuously to a steady value about half the original flexure strength. At 500°C, material properties initially improve then begin to slowly degrade. Optical microscopy indicates that oxidation of the matrix begins at the matrix/fiber interface and microcracks and proceeds into the bulk of the matrix.