Dimensional stability and tensile strength of irradiated Nicalon-CG and Hi-Nicalon SiC fibers
- Pacific Northwest National Lab., Richland, WA (United States)
- Lockheed Martin, Schenectady, NY (United States)
Nicalon-CG and Hi-Nicalon fibers were characterized by measuring their length, density, and tensile strength in the unirradiated, thermal annealed, and irradiated conditions. The irradiation was conducted in the EBR-II to a dose of 43 dpa-SiC at a nominal irradiation temperature of 1,000 C. The annealed specimens were held at 1,010 C for 165 days to approximately duplicate the thermal exposure of the irradiated specimens. The results indicate the fibers that perform best in an irradiation environment are those that approach stoichiometric and crystalline SiC. Hi-Nicalon exhibited negligible densification, accompanied by an increase in tensile strength after irradiation. Nicalon-CG possessed a higher tensile strength than hi-Nicalon in the unirradiated condition, but was significantly weakened in the annealed and irradiated conditions. In addition, Nicalon-CG exhibited unacceptable irradiation-induced shrinkage. Loss o fiber tensile strength after irradiation is shown to reduce the flexural strength of irradiated composites and Nicalon-CG fiber shrinkage observed in irradiated composites.
- Research Organization:
- Knolls Atomic Power Lab. (KAPL), Niskayuna, NY (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Nuclear Energy, Washington, DC (United States)
- DOE Contract Number:
- AC12-76SN00052
- OSTI ID:
- 319772
- Report Number(s):
- KAPL-P-000165; K-97046; CONF-970568-; ON: DE99001890; TRN: 99:003940
- Resource Relation:
- Conference: 99. annual meeting of the American Ceramic Society, Cincinnati, OH (United States), 4-7 May 1997; Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
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