Creep behavior for advanced polycrystalline SiC fibers

Technical Report · Tue Apr 01 00:00:00 EST 1997

DOI:https://doi.org/10.2172/543279· OSTI ID:543279

Youngblood, G. E.; Jones, R. H. ^[1]; Kohyama, Akira ^[2]

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1. Pacific Northwest National Lab., Richland, WA (United States)
2. Kyoto Univ. (Japan); and others

A bend stress relaxation (BSR) test has been utilized to examine irradiation enhanced creep in polycrystalline SiC fibers which are under development for use as fiber reinforcement in SiC/SiC composite. Qualitative, S-shaped 1hr BSR curves were compared for three selected advanced SiC fiber types and standard Nicalon CG fiber. The temperature corresponding to the middle of the S-curve (where the BSR parameter m = 0.5) is a measure of a fiber`s thermal stability as well as it creep resistance. In order of decreasing thermal creep resistance, the measured transition temperatures were Nicalon S (1450{degrees}C), Sylramic (1420{degrees}C), Hi-Nicalon (1230{degrees}C) and Nicalon CG (1110{degrees}C).

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 543279
• Report Number(s): DOE/ER-0313/21; ON: DE97008798; TRN: 97:020321
• Resource Relation: Other Information: PBD: Apr 1997; Related Information: Is Part Of Fusion materials semiannual progress report for the period ending December 31, 1996; PB: 296 p.
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
SILICON CARBIDES
PHYSICAL RADIATION EFFECTS
CREEP
FIBERS
PROGRESS REPORT
TRANSITION TEMPERATURE