"Effects of Processing and Microstructure on the Oxidation of ZrB2-SiC " by Marharyta Lakusta, Jeremy L. Watts et al.
 

Abstract

Oxidation kinetics and oxide scale microstructures were compared for ZrB2-30 vol% SiC composites fabricated by hot press sintering of powders and by pressure less sintering of additively manufactured billets. Oxidation in CO2 was conducted at temperatures up to 1400 °C with durations up to 900 h. All specimens exhibited parabolic oxidation kinetics. Materials with similar composition but different processing histories exhibited differences in oxidation behavior that become evident at extended durations (200–900 h) and higher temperatures (1200–1400 °C). Oxidation rates generally increased with grain size, e.g., at 1000 °C for 200 h, oxide scale thickness increased from 36 to 265 µm upon increasing ZrB2 and SiC grain sizes from 2.4 to 5.1 µm and 0.62–4.44 µm, respectively, by coarsening heat treatments. The increase in oxide scale thickness was attributed to a grain size effect caused by incomplete oxidation of large SiC grains.

Department(s)

Materials Science and Engineering

Comments

Advanced Research Projects Agency - Energy, Grant DE-AR0001125

Keywords and Phrases

Composites; Grain size; Oxidation resistance; SiC; ZrB 2

International Standard Serial Number (ISSN)

1873-619X; 0955-2219

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2025 Elsevier, All rights reserved.

Publication Date

01 May 2025

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