Chapter 7. Flexural Creep and Creep-Rupture Behavior of SiC/BN Dual Coated Nicalon Fiber Reinforced Glass-Ceramic Matrix Composites
- John B. Wachtman Jr.
Published Online: 28 MAR 2008
Copyright © 1994 The American Ceramic Society
Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4
How to Cite
Sun, E. Y., Nutt, S. R. and Brennan, J. J. (1994) Flexural Creep and Creep-Rupture Behavior of SiC/BN Dual Coated Nicalon Fiber Reinforced Glass-Ceramic Matrix Composites, in Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314500.ch7
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1994
Print ISBN: 9780470375327
Online ISBN: 9780470314500
- variable differential;
An advanced structural composite was produced by incorporating coated Nicalon fibers into a barium magnesium aluminosilicate (BMAS) glass-ceramic matrix. The fibers were coated with a dual layer of SiC/BN by CVD. The flexural creep and creep-rupture behavior of the composites was investigated. Flexural creep experiments were conducted at 1000 — 1200°C in air under applied stresses of 100 — 670MPa using three-point and four-point bending fixtures. The constant creep rates were low (∼10E-9 s−1) and beyond our ability to accurately measure at temperatures below 1130°C. Large creep-strain recovery (∼90%) was observed upon unloading. At stress levels close to the composite ultimate failure stress, hinges formed under the loading pins and creep-rupture occurred subsequently.