Chapter 61. Preparation and Properties of SiC/SiC Composites with Various Matrices
- Hua-Tay Lin,
- Mrityunjay Singh
Published Online: 26 MAR 2008
Copyright © 2002 The American Ceramic Society
26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3
How to Cite
Sato, M., Suzuki, M., Tanaka, Y., Inoue, Y., Miyamoto, N., Ishikawa, T., Katoh, Y. and Kohyama, A. (2008) Preparation and Properties of SiC/SiC Composites with Various Matrices, in 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3 (eds H.-T. Lin and M. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294741.ch61
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 2002
Print ISBN: 9780470375785
Online ISBN: 9780470294741
- SiC/SiC composites;
- SiC-based matrix;
In order to improve mechanical properties of conventional SiC/SiC composites at a high temperature in air, new type matrices and interphase were developed.
The addition of ZrSiO4 particles into SiC-based matrix improved the strength of SiC/SiC composite at high temperature in air, even the SiC-based matrix has included a lot of excess carbon. Tyarnno fiber ZMI-S6/C/SiC composite with ZrSiO4-dispersed matrix, which had the carbon interphase, exhibited about 400MPa of tensile strength at 1673K in air. For the purpose of reducing the excess carbon, co-polymer of polymethylsilane (PMS) and carbosilane oligomer (CSO) were synthesized as the precursor for SiC-based matrix. The co-polymer consisting 30 mass% CSO and 70 mass% PMS could be converted into a near-stoichiometric SiC matrix. In order to prepare the dense SiC/SiC composite, two methods were developed. One is the combined process (PIP/MI process) with PIP process and melt infiltration route (MI process). MI process was curried out after the PIP-process. In general, the SiC fiber in the SiCF/SiC composites by MI-process is easily damaged by the reaction with molten Si. In the case of PIP/MI process, the matrix phase formed by the PIP process protected the SiC fiber from the reaction with molten Si. Another is the sintering method using nano-sized SiC powder and sintering agent for the matrix. A cylindrical SiCF/VSiC composite using polycrystalline SiC fiber (Tyranno-SA) was formed in near-net shape by the sintering method employing a pseudo-HIP.
It causes the drop in mechanical properties of SiC'VSiC composites that the fiber fuses with the matrix after the degradation of interphases by oxidation. The crystallized ZrSiO4 interphase was not adhered to oxidized SiC fibers at a high temperature. Therefore, it is promising that the ZrSiO4 interphase is effective for toughening SiC'VSiC composites at high temperature in air. In this work, the ZrSiO4/C double interphase employed for a SiC'VSiC composite. The SiC'VSiC composite with the ZrSiO4/C double interphase exhibited about 350MPa of tensile strength at 1673K in air.