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

被引：0
作者：
Xibao Li
Jinshan Lu
Zhijun Feng
机构：
[1] Nanchang Hangkong University,School of Materials Science and Engineering
来源：
Journal of Materials Science | 2015年 / 50卷
关键词：
Y2O3; Oxidation Resistance; Oxidation Behavior; Oxidation Time; Isothermal Oxidation;
D O I：
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中图分类号：
学科分类号：
摘要：
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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页码：7097 / 7103
页数：6
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