Abstract
SiC-based fibers, Hi-Niclaon™, Hi-Nicalon™ type S and Tyranno™-SA, were heat treated at 1300-1900 °C in Ar for 1 h. After heat treatment, room temperature tensile strength and 1-h bend stress relaxation (BSR) at 1400 °C in Ar were evaluated for these fibers. As a result, excellent strength retention was exhibited after heat treatment at temperature up to 1780 °C for the Hi-Nicalon™ type S fiber and up to 1900 °C for the Tyranno™-SA fiber. In contrast, relatively low strength retention was observed for Hi-Nicalon™ fiber heat-treated above 1600 °C. Creep resistance of the as-received fibers was improved by high-temperature heat treatments, especially at temperatures above the fiber's processing temperature. The microstructure analysis by means of X-ray diffractometer (XRD) and scanning electron microscopy (SEM) indicated that properties of SiC fibers at elevated temperatures are controlled by crystallite size as well as by other factors.
| Original language | English |
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| Pages (from-to) | 592-596 |
| Number of pages | 5 |
| Journal | Journal of Nuclear Materials |
| Volume | 329-333 |
| Issue number | 1-3 PART A |
| DOIs | |
| State | Published - Aug 1 2004 |
| Event | Proceedings of the 11th Conference on Fusion Research - Kyoto, Japan Duration: Dec 7 2003 → Dec 12 2003 |
Funding
This work was supported by the 21st COE research program of Kyoto University on the establishment of sustainable energy system.
| Funders | Funder number |
|---|---|
| Kyoto University |