Oxidation of Additively Manufactured ZrB2–SiC in Air and in CO2 at 700–1000 °C

Oxidation behavior of additively manufactured ZrB2–SiC in air and in CO2 is reported in the temperature range of 700–1000 °C. Observed scale morphologies in air and in CO2 were similar, featuring an outer borosilicate layer and an inner porous zirconia layer containing partially oxidized silicon car...

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Bibliographic Details
Published in:	Oxidation of metals Vol. 101; no. 4; pp. 827 - 841
Main Authors:	Lakusta Marharyta, Timme, Nicholas M, Rafi, Abid H, Watts, Jeremy L, Leu, Ming C, Hilmas, Gregory E, Fahrenholtz, William G, Lipke, David W
Format:	Journal Article
Language:	English
Published:	New York Springer Nature B.V 2024
Subjects:	Borosilicate Carbon dioxide Diffusion rate Heat exchangers High temperature Oxidation Oxidizing agents Refractory materials Scale (corrosion) Silicon carbide Thickness Zirconium compounds Zirconium dioxide
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Summary:	Oxidation behavior of additively manufactured ZrB2–SiC in air and in CO2 is reported in the temperature range of 700–1000 °C. Observed scale morphologies in air and in CO2 were similar, featuring an outer borosilicate layer and an inner porous zirconia layer containing partially oxidized silicon carbide particles and remnant borosilicate products. Oxide scale thicknesses and parabolic scaling constants in air were approximately twice those observed in CO2 across all studied temperatures. Activation energies for oxidation of 140 ± 20 kJ/mol in air and 110 ± 20 kJ/mol in CO2 were determined, indicating similar diffusion processes that appear to be rate-limiting. The formation of protective scales across wide temperature ranges both in air and in CO2 makes additively manufactured ZrB2–SiC an attractive candidate for high-temperature industrial process applications featuring varied oxidants such as heat exchangers.
ISSN:	0030-770X 1573-4889
DOI:	10.1007/s11085-024-10241-2