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Journal of Materials Science

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01-11-2015 | Original Paper

Microstructural characteristics and oxidation behavior of Y₂O₃-doped γ-AlON

Authors: Xibao Li, Jinshan Lu, Zhijun Feng

Published in: Journal of Materials Science | Issue 21/2015

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Abstract

The crystal structure of phases, microstructure, and elemental composition of Y₂O₃-doped γ-AlON were characterized by the analysis of XRD, FESEM, and EDS, and the oxidation behavior was studied by the oxidation tests and TG–DSC analysis in air from room temperature to 1300 °C. TG–DSC results show that the oxidation weight gain changes from 10 to 2 % and the vigorous oxidation temperature of γ-AlON changes from 1100 to 1200 °C after doping with 2 wt% Y₂O₃. Y₃Al₅O₁₂ (YAG) phase and AlYO₃ (YAP) phase were formed as second phases in Y₂O₃-doped γ-AlON ceramic due to the reaction of Y₂O₃ with Al₂O₃. Y₂O₃-doped γ-AlON ceramic exhibited denser microstructure as compared to γ-AlON ceramic. The relationship of oxidation weight gain with oxidation time follows a parabolic law. The oxidation reaction rate of Y₂O₃-doped γ-AlON is far less than that of pure γ-AlON. YAG and YAP distributing at the grain boundaries and the higher relative density contribute to the improvement in the oxidation resistance of Y₂O₃-doped γ-AlON.

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Title: Microstructural characteristics and oxidation behavior of Y2O3-doped γ-AlON
Authors: Xibao Li
Jinshan Lu
Zhijun Feng
Publication date: 01-11-2015
Publisher: Springer US
Published in: Journal of Materials Science / Issue 21/2015
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-015-9264-x

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