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Journal of Ceramic Science and Technology

The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of  the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.

The Journal is published by Göller Verlag GmbH on behalf of the Deutsche Keramische Gesellschaft (DKG). Edited by Yu-Ping Zeng, Shanghai Institute of Ceramics, Chinese Academy of Sciences, China.

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In-Situ Synthesis and Formation Mechanism of Al2O3-Spinel(N) Composite in Nitrogen Atmosphere under Low Oxygen Partial Pressure

S. Tong1, Y. Li1, J. Zhao2, M. Yan1, Y. Hong1, Q. Zheng1

1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 Beijing Lier High-Temperature Materials Co., Ltd., Beijing 102200, China

received May 8, 2017, received in revised form July 13, 2017, accepted August 20, 2017

Vol. 8, No. 4, Pages 513-518   DOI: 10.4416/JCST2017-00030

Abstract

Al2O3-spinel-containing nitrogen element composite, abbreviated as Al2O3-spinel(N) composite, was prepared using white corundum, sintered magnesia and active α-Al2O3 powder as raw materials, with magnesium aluminate sol as a binder, and fired at 1600 °C for 4 h in a nitrogen atmosphere with low oxygen partial pressure. The prepared Al2O3-spinel(N) composite was characterized and analyzed by means of XRD, SEM, and EDS and the mechanism for the formation of the spinel(N) was further investigated. The results show that in nitrogen atmosphere with low oxygen partial pressure, Al2O3-spinel(N) composite is composed of alumina, spinel-containing nitrogen element and a little aluminum nitride; the spinel-containing nitrogen bonds the aggregates and matrix together, further realizing dense sintering of the Al2O3-spinel(N) composite. The mechanism for formation of the spinel(N) can be described as follows: in nitrogen atmosphere with low oxygen partial pressure, magnesia is unstable and decomposes into Mg(g). Mg(g) diffuses and transfers along the pores or gaps in Al2O3-MgO composites and reacts with corundum or spinel, forming gas aluminum at the same time. The gas metal aluminum then nitrides into aluminum nitride. The formed aluminum nitride further solid-solves into spinel, forming the spinel-containing nitrogen element.

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Keywords

Magnesia aggregates, low oxygen partial pressure, Mg(g), spinel

References

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