Chapter 5. Preparation of Carbon Fiber Reinforced Composite by Impregnation with Perhydropolysilazane Followed by Pressureless Firing
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1992 The American Ceramics Society
Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10
How to Cite
Sato, K., Suzuki, T., Funayama, O., Isoda, T. and Itoh, T. (1994) Preparation of Carbon Fiber Reinforced Composite by Impregnation with Perhydropolysilazane Followed by Pressureless Firing, in Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313978.ch5
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1994
Print ISBN: 9780470375198
Online ISBN: 9780470313978
A low viscosity perhydropolysilazane which is converted to Si-N ceramics with a 70–90 wt% yield by pyrolyzing at temperatures above 800 °C, was used as a matrix precursor. The preforms of Cf/Si-N and Cf/SiCw/Si-N with unidirectional aligned fiber were prepared by a filament winding. The prepreg was cured at 100–300 °C in a N2 atmosphere with the pressure of 0.05–0.1 ma, and fired to 1200 °C. To obtain dense composites, the samples were impregnated with polysilazane and followed by the curing and firing. The reimpregnation and firing processes were repeated. The densities of Cf/Si-N and Cf/SiCw/Si-N were increased to 90–96 % of theoretical values. Such superior densification resulted from the excellent in filterability and the high ceramic yield of the polysilazane. Owing to the high density of the matrix and the adequate shear strength of the fiber/matrix interface, the three-point flexural strength was substantially high, 500–700 MPa. By applying this process, near-net shaped parts were easily fabricated.