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Ceramist > Volume 23(3); 2020 > Article
Ceramist 2020;23(3):244-260.
DOI: https://doi.org/10.31613/ceramist.2020.23.3.01    Published online September 30, 2020.
Transparent Polycrystalline γ-AlON Ceramics
Muhammad Tsabit Ayman, Hyeon Mo Bae, Heejin Kwon, Jaehyung Lee, Dang-Hyok Yoon
School of Materials Science and Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
Correspondence:  Dang-Hyok Yoon, Tel: 82-53-810-2561, Fax: 82-53-810-4628, 
Email: dhyoon@ynu.ac.kr
Received: 29 July 2020   • Revised: 31 August 2020   • Accepted: 3 September 2020
Abstract
Among many kinds of transparent ceramics, polycrystalline gamma-aluminum oxynitride (γ-AlON) exhibits superior optical and mechanical properties to MgAl2O4 (Mg-spinel), ZnS, MgO, and Y2O3, which are even comparable to those of sapphire. Due to its high strength, hardness, and wide transmittance range from the UV to mid-IR (0.2 – 5.2 μm), γ-AlON is being applied to IR cameras, scratch-resistant windows, missile domes, transparent armor, and others, especially with increasing demand nowadays. This report discusses the basic formation mechanism of transparent γ-AlON from the Al2O3 and AlN starting materials as well as its stoichiometry based on a proposed constant anion model. In addition, the results from authors’ own research, including the effects of 2-step pressureless sintering and rare earth sintering additive on the properties of γ-AlON, are explained. We hope that this article helps expanding readers’ understanding on transparent ceramics as well as establishing research direction for further breakthrough of transparent polycrystalline γ-AlON.
Key Words: γ-AlON, Transparent ceramics, Polycrystalline, Transmittance
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