Oxidation resistance of AlN/BN via mullite-type Al₁₈B₄O₃₃
- Creators
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Chari, C. S.
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Faber, K. T.
Abstract
AlN/BN ceramic composites are materials of interest for high-temperature applications because of their low elastic modulus and high thermal shock resistance. Concerns of side products that could form, due to the oxidation of BN into reactive B₂O₃, motivate the study of the influence of B₂O₃ on the oxidation of AlN and AlN/BN. This investigation explores such an effect by comparing the oxidation kinetics of AlN with that of B₂O₃-coated AlN, offering insight into how liquid B₂O₃ films provide AlN with improved protection against oxidation at temperatures from 1200 to 1300 °C. These concepts are extended to AlN/BN in oxidative environments. We discuss the formation of Al₁₈B₁₈O₃₃ whiskers from B₂O₃ and Al₂O₃ and analyze how the microstructure evolves into hollow crystals with prolonged exposure to high-temperatures. Ultimately, this study provides a novel perspective on the oxidation of AlN/BN and serves as a guide to understanding the morphological evolution of Al₁₈B₁₈O₃₃.
Additional Information
© 2022 Published by Elsevier. Received 24 November 2021, Revised 13 February 2022, Accepted 16 February 2022, Available online 22 February 2022. The authors would like to acknowledge the support from NASA's Jet Propulsion Laboratory through a Research and Technology Development Grant, and for C. S. Chari, the Amelia Earhart Fellowship from Zonta International. SEM work was performed in the Division of Geology and Planetary Science Analytical Facility at Caltech. The authors would like to thank Prof. George R. Rossman and Mark Garcia for their help in accessing and photographing minerals from the Mineral Room Collection of the Division of Geology and Planetary Science Analytical Facility at Caltech, and Dr. Bryan W. McEnerney (Materials Engineering, Test & Evaluation, NASA JPL) for his encouragement and enthusiasm about the project. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.Attached Files
Supplemental Material - 1-s2.0-S0955221922001297-mmc1.docx
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Additional details
- Alternative title
- Oxidation resistance of AlN/BN via mullite-type Al18B4O33
- Eprint ID
- 113524
- Resolver ID
- CaltechAUTHORS:20220222-706520000
- JPL Research and Technology Development Fund
- Zonta International Amelia Earhart Fellowship
- Created
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2022-02-24Created from EPrint's datestamp field
- Updated
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2022-04-06Created from EPrint's last_modified field