High dose neutron irradiations of Hi-Nicalon Type S silicon carbide composites, Part 1 [electronic resource] : Microstructural evaluations
- Published
- Washington, D.C. : United States. Dept. of Energy. Office of Science, 2014.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy - Physical Description
- pages 443-449 : digital, PDF file
- Additional Creators
- Oak Ridge National Laboratory, United States. Department of Energy. Office of Science, and United States. Department of Energy. Office of Scientific and Technical Information
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- Free-to-read Unrestricted online access
- Summary
- Over the past decade, significant progress has been made in the development of silicon carbide (SiC) composites, composed of near-stoichiometric SiC fibers embedded in a crystalline SiC matrix, to the point that such materials can now be considered nuclear grade. Recent neutron irradiation studies of Hi-Nicalon Type S SiC composites showed excellent radiation response at damage levels of 30-40 dpa at temperatures of 300-800 °C. However, more recent studies of these same fiber composites irradiated to damage levels of >70 dpa at similar temperatures showed a marked decrease in ultimate flexural strength, particularly at 300 °C. Here, electron microscopy is used to analyze the microstructural evolution of these irradiated composites in order to investigate the cause of the degradation. While minimal changes were observed in Hi-Nicalon Type S SiC composites irradiated at 800 °C, substantial microstructural evolution is observed in those irradiated at 300° C. Furthermore, carbonaceous particles in the fibers grew by 25% compared to the virgin case, and severe cracking occurred at interphase layers.
- Report Numbers
- E 1.99:1195799
- Subject(s)
- Note
- Published through SciTech Connect.
07/01/2014.
"AT6020100"
"ERAT762"
Journal of Nuclear Materials 462 7 ISSN 0022-3115 AM
Alex G. Perez-Bergquist; Takashi Nozawa; Chunghao Phillip Shih; Keith J. Leonard; Lance Lewis Snead; Yutai Katoh. - Funding Information
- AC05-00OR22725
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