Chapter 20. B4C Coated Carbon Fibre Reinforced Si,N4
- 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
Bronsveld, P. M., Gideonse, I., van der Heide, A., Guder, S., De Hosson, J. Th. M., Sabouret, E., Veyret, J. B. and Bullock, E. (1996) B4C Coated Carbon Fibre Reinforced Si,N4, 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.ch20
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1996
Print ISBN: 9780470375433
Online ISBN: 9780470314876
- interfaces and coatings;
- pitch-based carbon fibre;
- slurry infiltration;
- deflection curves
The quality of long, pitch-based carbon fibre reinforced Si3N4 composites prepared by slurry infiltration and hot-pressing were assessed from mechanical properties combined with acoustic emission. Typical room temperature load vs. deflection curves were measured. Macro- and microstructural observations with optical microscopy, X-ray powder diffraction and scanning, transmission and high resolution electron microscopy are presented. The amount of α to β transformation of the Si3N4 matrix, and the amount of SiC as reaction product were determined by XPD. The composition of the interfacial crack surfaces were analysed by energy dispersive X-ray and parallel electron energy loss spectroscopy. The results were focused on composites reinforced with carbon fibres precoated with a B4C and a Cpyr/B4C coating. The effects of such coatings on the load transfer at the fibre/matrix interface are discussed. Composites with B4C coated fibres exhibit a higher crack toughness—with some reduction in strength—than composites with uncoated fibres or Cpyr/B4C coated fibres.