Microstructural Design for Improved Mechanical Behaviour of Advanced Materials
J. Phys. IV France 10 (2000) Pr6-97-Pr6-103
Application of HRTEM to studies of electronic structure and atomic configuration of interface in SiC/SiC compositesT. Shibayama1, G.W. He1, Heishichiro Takahashi1 and A. Kohyama2
1 Center for Advanced Research of Energy Technology, Hokkaido University, Sapporo 060-8628, Japan
2 Institute of Advanced Energy, Kyoto University, Uji 611-0011, Japan
The continuous fiber ceramic composite (CFCC), such as SiC/SiC composites have attractive features for advanced energy conversion and production systems, especially gas turbines and fusion power reactors. Because SiC is well known to exhibit a quite fast decay behavior and an excellent oxidation resistance behavior due to the formation of a passive SiO2, layer. The variety of criteria for environmental effects of microstructural evolution at interface of SiC/SiC composites is proposed. Of interest is that the degradation of the composite is observed after annealed at 1500°C under ultra high purity Ar flow condition. However there are few data of nano-structure analyses at interface of SiC/SiC composites. In this work, the environmental effects of microstructural evolution in SiC/SiC composites are examined by a Field Emission type High-Resolution Electron Microscopy (FE-HRTEM) and a Parallel Electron Energy Loss Spectroscopy (PEELS). A possible mechanism for this degradation is discussed and proposed.
© EDP Sciences 2000