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Journal of Advanced Ceramics 2022, 11(4): 582-588 https://doi.org/10.1007/s40145-021-0558-y
Research Article | Open Access | Issue | Published: 17 March 2022

High transmittance and grain-orientated alumina ceramics fabricated by adding fine template particles

Show Author's Information Han CHENa,c,  Jin ZHAOb,c,  Shunzo SHIMAIc,  Xiaojian MAOb,c,  Jian ZHANGb,c,  Guohong ZHOUb,c,  Shiwei WANGb,c( ),  Na GUd,  Kai ZHENGd
University of Chinese Academy of Sciences, Beijing 100049, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Shandong Guiyuan Advanced Ceramics Co., Ltd., Zibo 255000, China
Keywords:
orientation, templated grain growth (TGG), transparent alumina
Cite this article:
CHEN H, ZHAO J, SHIMAI S, et al. High transmittance and grain-orientated alumina ceramics fabricated by adding fine template particles. Journal of Advanced Ceramics, 2022, 11(4): 582-588. https://doi.org/10.1007/s40145-021-0558-y
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Abstract Full text About this article

Transparent Al2O3 ceramics with grains aligned to the c-axis were prepared by adding platelets with a low aspect ratio into fine equiaxed particles. The mixed powders were formed into green bodies using spontaneous coagulation casting and sintered by pressureless sintering and hot-isostatic pressure sintering. Zeta potentials and rheological behavior of the slurries, relative densities of green bodies, and orientation and optical properties of sintered bodies were investigated and discussed. The platelet with a high aspect ratio suppressed densification more seriously during sintering than the one with a low aspect ratio. An excellent oriented structure was obtained when 5 wt% platelets with a low aspect ratio were added, and transparent Al2O3 ceramics with grains aligned to c-axis were successfully prepared; the in-line transmittance was 78.4% at 600 nm, which is the highest one in the currently reported literature.


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About this article

High transmittance and grain-orientated alumina ceramics fabricated by adding fine template particles

Show Author's information Han CHENa,c, Jin ZHAOb,c, Shunzo SHIMAIc, Xiaojian MAOb,c, Jian ZHANGb,c, Guohong ZHOUb,c, Shiwei WANGb,c( ), Na GUd, Kai ZHENGd
University of Chinese Academy of Sciences, Beijing 100049, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Shandong Guiyuan Advanced Ceramics Co., Ltd., Zibo 255000, China

Abstract

Transparent Al2O3 ceramics with grains aligned to the c-axis were prepared by adding platelets with a low aspect ratio into fine equiaxed particles. The mixed powders were formed into green bodies using spontaneous coagulation casting and sintered by pressureless sintering and hot-isostatic pressure sintering. Zeta potentials and rheological behavior of the slurries, relative densities of green bodies, and orientation and optical properties of sintered bodies were investigated and discussed. The platelet with a high aspect ratio suppressed densification more seriously during sintering than the one with a low aspect ratio. An excellent oriented structure was obtained when 5 wt% platelets with a low aspect ratio were added, and transparent Al2O3 ceramics with grains aligned to c-axis were successfully prepared; the in-line transmittance was 78.4% at 600 nm, which is the highest one in the currently reported literature.

Keywords: orientation, templated grain growth (TGG), transparent alumina

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Publication history
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Publication history

Received: 09 July 2021
Revised: 25 November 2021
Accepted: 26 November 2021
Published: 17 March 2022
Issue date: April 2022

Copyright

© The Author(s) 2021.

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 51772309 and 52130207). The authors thank Prof. Jing WANG (Dalian University of Technology) for the synthesis of Al2O3 platelets.

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