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Journal of Advanced Ceramics 2022, 11(9): 1375-1382 https://doi.org/10.1007/s40145-022-0615-1
Research Article | Open Access | Issue | Published: 21 July 2022

Re-fluidising the aged gel for high-density alumina green body

Show Author's Information Xiaolang WUa,b,  Jin ZHAOa,b( ),  Shunzo SHIMAIa,  Xiaojian MAOa,b,  Jian ZHANGa,b,  Shiwei WANGa,b( )
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Keywords:
alumina, high density, green body, re-fluidising, colloid formation
Cite this article:
WU X, ZHAO J, SHIMAI S, et al. Re-fluidising the aged gel for high-density alumina green body. Journal of Advanced Ceramics, 2022, 11(9): 1375-1382. https://doi.org/10.1007/s40145-022-0615-1
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Abstract Full text About this article

A green body with a density as high as possible is critical to diminish the crisis of deformation or cracking when large-size parts are sintered. Here, a new method, i.e., re-fluidising the aged ceramic gel is developed to prepare the high-density green body. Alumina slurry with 56 vol% solid loading and copolymers of isobutylene and maleic anhydride were aged without vaporisation and re-fluidised by non-intrusive shearing after removing the exuded water. The re-fluidised slurry was re-casted. The resultant wet gel was dried and deboned at a low temperature. The relative density of the obtained green body was 64.6%, 1.5% higher than that without aging and re-fluidising. The linear sintering shrinkage of the body decreased by 0.7%. The enhanced green density is explained from the viewpoint of the solid loading and the structure of the slurry.


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About this article

Re-fluidising the aged gel for high-density alumina green body

Show Author's information Xiaolang WUa,b, Jin ZHAOa,b( ), Shunzo SHIMAIa, Xiaojian MAOa,b, Jian ZHANGa,b, Shiwei WANGa,b( )
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Abstract

A green body with a density as high as possible is critical to diminish the crisis of deformation or cracking when large-size parts are sintered. Here, a new method, i.e., re-fluidising the aged ceramic gel is developed to prepare the high-density green body. Alumina slurry with 56 vol% solid loading and copolymers of isobutylene and maleic anhydride were aged without vaporisation and re-fluidised by non-intrusive shearing after removing the exuded water. The re-fluidised slurry was re-casted. The resultant wet gel was dried and deboned at a low temperature. The relative density of the obtained green body was 64.6%, 1.5% higher than that without aging and re-fluidising. The linear sintering shrinkage of the body decreased by 0.7%. The enhanced green density is explained from the viewpoint of the solid loading and the structure of the slurry.

Keywords: alumina, high density, green body, re-fluidising, colloid formation

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Publication history

Received: 09 March 2022
Revised: 13 May 2022
Accepted: 20 May 2022
Published: 21 July 2022
Issue date: September 2022

Copyright

© The Author(s) 2022.

Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 52130207).

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