Abstract
Microstructural evolution of silicon carbide fiber-reinforced silicon carbide matrix composites (SiC/SiC composites) during dual-beam ion irradiation was studied. The composites had been fabricated by means of chemical vapor infiltration (CVI) and polymer impregnation and pyrolysis (PIP) methods using advanced fibers, i.e., Hi-Nicalon™ Type-S and Tyranno™-SA, as well as conventional fibers. Dual-beam ion irradiation was performed to 10 dpa at 873 K and 60 appmHe/dpa. Composites with advanced low-oxygen near-stoichiometric SiC fiber with high crystallinity and beta-SiC matrix exhibited superior irradiation resistance, in contrast to that amorphous Si-C-O based fibers and conventional polymer-derived matrix exhibited microstructural instability in association with irradiation-induced crystallization. Pyrolytic carbon deposited as the fiber-matrix (F-M) interphase exhibited irradiation-induced amorphization and the helium co-implantation enhanced it. Post-irradiation heat treatment caused significant microstructural changes across the F-M interphases at temperatures as low as the composites are supposed to retain their mechanical strength.
| Original language | English |
|---|---|
| Pages (from-to) | 786-798 |
| Number of pages | 13 |
| Journal | Institution of Chemical Engineers Symposium Series |
| Issue number | 148 |
| State | Published - 2000 |
| Externally published | Yes |
| Event | Hazards XVI Analysing the Past, Planning the Future - Manchester, United Kingdom Duration: Nov 6 2001 → Nov 8 2001 |
Keywords
- Helium effect
- Ion irradiation
- Microstructure
- SiC fiber
- SiC/SiC composite
- TEM