Grain size variation in nanocrystalline silicon carbide irradiated at elevated temperatures

Zhang, Limin; Jiang, Weilin; Ai, Wensi; Chen, Liang; Pan, Chenlong; Wang, Tieshan

doi:10.1111/jace.15895

Title: Grain size variation in nanocrystalline silicon carbide irradiated at elevated temperatures

Journal Article · Thu Jul 05 00:00:00 EDT 2018 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.15895· OSTI ID:1506989

^[1]; Jiang, Weilin ^[2]; Ai, Wensi ^[1]; Chen, Liang ^[1]; Pan, Chenlong ^[1]; Wang, Tieshan ^[1]

School of Nuclear Science and Technology, Lanzhou University, Lanzhou Gansu China
Pacific Northwest National Laboratory, Richland Washington

This study reports on ion irradiation-induced grain growth in nanocrystalline SiC films on Si substrates. The SiC grains with average size ranging from ~2 to 20 nm were embedded in amorphous SiC matrices. Irradiation was performed using 5 MeV Xe23+ ions to 115 ions/nm2 at 700 K. The irradiated films were characterized using x-ray diffraction, transmission electron microscopy and Raman spectroscopy. Significant grain growth is observed for smaller grains that tend to saturate at ~8 nm. In contrast, irradiation of larger grains (~20 nm in size) leads to a decrease in the grain size, which could be associated with the production of lattice disorder within the grains. Homonuclear C-C bonds in the irradiated amorphous SiC matrix are found to be graphitized. This bonding transformation could limit or inhibit grain growth and contribute to the size saturation. The results from this study may suggest nanocrystalline SiC as a promising candidate structural or cladding material for applications in advanced nuclear reactors.

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Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1506989

Report Number(s):: PNNL-SA-133139

Journal Information:: Journal of the American Ceramic Society, Vol. 102, Issue 1; ISSN 0002-7820

Publisher:: American Ceramic Society

Country of Publication:: United States

Language:: English

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