Abstract
In order to make an interfacial shear strength control layer (ISSCL), such as pyrolytic C layer, effective and improve SiC/SiC composites' mechanical properties, heat treatment at 1500 °C under Ar flow in quite low O2 partial pressure or a CVI SiC coating were applied to Hi-NicalonTM SiC fibers. Interfacial microstructures between fiber and matrix were examined by SEM and TEM. Interfacial shear properties were evaluated by single-fiber push-out tests and compared with the results of three-point bend tests and tensile tests. Fracture surfaces after mechanical tests were examined by SEM with EDS and optical interferometric profilometry. Active oxidation of the fibers decreased fiber mechanical properties and made the composites brittle, although it was successful in making the ISSCL rough. SiC fiber coating induced strong bonding between fiber and ISSCL and turned the crack path from between the fiber and the ISSCL to the inside of the ISSCL. Interfacial frictional stress was increased and the mechanical properties of tensile tests were improved.
| Original language | English |
|---|---|
| Pages (from-to) | 23-29 |
| Number of pages | 7 |
| Journal | Journal of Nuclear Materials |
| Volume | 289 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - Feb 2001 |
| Externally published | Yes |
Funding
The authors would like to thank Dr Noda and Mr Araki for assistance with material fabrication. This work was supported by the Core Research for Evolutional Science and Technology (CREST) program under the title of `R & D of environment conscious multi-functional structural materials for advanced energy systems'.
| Funders | Funder number |
|---|---|
| Core Research for Evolutional Science and Technology |