Creep behavior for advanced polycrystalline SiC fibers
- Pacific Northwest National Lab., Richland, WA (United States)
- Kyoto Univ. (Japan); and others
A bend stress relaxation (BSR) test is planned to examine irradiation enhanced creep in polycrystalline SiC fibers which are under development for use as fiber reinforcement in SiC/SiC composite. Baseline 1 hr and 100 hr BSR thermal creep {open_quotes}m{close_quotes} curves have been obtained for five selected advanced SiC fiber types and for standard Nicalon CG fiber. The transition temperature, that temperature where the S-shaped m-curve has a value 0.5, is a measure of fiber creep resistance. In order of decreasing thermal creep resistance, with the 100 hr BSR transition temperature given in parenthesis, the fibers ranked: Sylramic (1261{degrees}C), Nicalon S (1256{degrees}C), annealed Hi Nicalon (1215{degrees}C), Hi Nicalon (1078{degrees}C), Nicalon CG (1003{degrees}C) and Tyranno E (932{degrees}C). The thermal creep for Sylramic, Nicalon S, Hi Nicalon and Nicalon CG fibers in a 5000 hr irradiation creep BSR test is projected from the temperature dependence of the m-curves determined during 1 and 100 hr BSR control tests.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 543205
- Report Number(s):
- DOE/ER--0313/22; ON: DE97008797
- Country of Publication:
- United States
- Language:
- English
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