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In this paper, Si3N4 was used as a novel solid-state sintering additive to prepare AlON transparent ceramics with high transparency and flexural strength via the pressureless pre-sintering and hot isostatic pressing (HIP) method at a relatively low HIP temperature (1800 ℃). The effect of Si3N4 content on the phase, microstructure, optical property, and flexural strength was investigated. The experimental results showed that a Si element was homogenously distributed in both pre-sintered and HIPed AlON ceramics. The densification enhanced, the grain grew with the increasing Si3N4 content in the pre-sintered AlON ceramics, and all the samples became pore-free after HIP, which favor transparency. The AlON ceramics doped with 0.10 wt% Si3N4 had the highest transmittance of 83.8% at 600 nm and 85.6% at 2000 nm (4 mm in thickness), with flexural strength of 404 MPa, which were higher than those of the previous reports.


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Fabrication of AlON transparent ceramics with Si3N4 sintering additive

Show Author's information Liqiong Ana( )Rongwei Shia,bXiaojian Maob( )Buhao Zhangb,cJianmin LibJian ZhangbShiwei Wangb
College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China
State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK

Abstract

In this paper, Si3N4 was used as a novel solid-state sintering additive to prepare AlON transparent ceramics with high transparency and flexural strength via the pressureless pre-sintering and hot isostatic pressing (HIP) method at a relatively low HIP temperature (1800 ℃). The effect of Si3N4 content on the phase, microstructure, optical property, and flexural strength was investigated. The experimental results showed that a Si element was homogenously distributed in both pre-sintered and HIPed AlON ceramics. The densification enhanced, the grain grew with the increasing Si3N4 content in the pre-sintered AlON ceramics, and all the samples became pore-free after HIP, which favor transparency. The AlON ceramics doped with 0.10 wt% Si3N4 had the highest transmittance of 83.8% at 600 nm and 85.6% at 2000 nm (4 mm in thickness), with flexural strength of 404 MPa, which were higher than those of the previous reports.

Keywords: transparent ceramics, Si3N4, hot isostatic pressing (HIP), sintering additive, alumina oxynitride (AlON)

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Received: 05 February 2023
Revised: 26 April 2023
Accepted: 27 April 2023
Published: 12 June 2023
Issue date: July 2023

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© The Author(s) 2023.

Acknowledgements

This work was supported by the Natural Science Foundation of Shanghai (Grant No. 19ZR1465000) and the National Natural Science Foundation of China (Grant No. 51902330). Many thanks to Tianjin Zhonghuan Electric Furnace Co., Ltd. for the shrinkage measurment.

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