Effects of microstructure on the oxidation behavior of A3 matrix‐grade graphite

Bratten, Adam; Duan, Jiaqi; Hoffman, Andrew; Wen, Haiming; He, Xiaoqing; Stempien, John D.

doi:10.1111/jace.17468

Effects of microstructure on the oxidation behavior of A3 matrix‐grade graphite

Journal Article · Tue Sep 15 00:00:00 EDT 2020 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.17468· OSTI ID:1787123

^[1]; Duan, Jiaqi ^[1]; Hoffman, Andrew ^[2]; Wen, Haiming ^[3]; He, Xiaoqing ^[4]; Stempien, John D. ^[5]

Department of Materials Science and Engineering Missouri University of Science and Technology Rolla MO USA
Department of Mining and Nuclear Engineering Missouri University of Science and Technology Rolla MO USA
Department of Materials Science and Engineering Missouri University of Science and Technology Rolla MO USA, Department of Mining and Nuclear Engineering Missouri University of Science and Technology Rolla MO USA
Electron Microscopy Core Facilities University of Missouri Columbia MO USA, Department of Mechanical and Aerospace Engineering University of Missouri Columbia MO USA
Idaho National Laboratory Idaho Falls ID USA

Abstract The oxidation behavior of matrix‐grade graphite in air‐ or steam‐ingress accident scenarios is of great interest for high‐temperature gas reactors (HTGRs). In this study, the microstructures of two variants of matrix‐grade graphite based on the German A3‐3 and A3‐27 formulations were characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy, and correlated to oxidation behavior observed through thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Through TEM imaging and selected area electron diffraction (SAED), a higher volume fraction of partially graphitized carbon was identified in the A3‐3 type graphite than in the A3‐27 type. This structure is believed to have contributed to the accelerated oxidation exhibited by A3‐3 in the chemical reaction‐controlled oxidation regime.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

OSTI ID:: 1787123

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Vol. 104 Journal Issue: 1; ISSN 0002-7820

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United States

Language:: English

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