Sintering of monoclinic SrAl2Si2O8 ceramics and their Sr immobilization

Jie Luo; Xin Li; Fu-jie Zhang; Song Chen; Ding Ren

doi:10.1007/s12613-020-2056-6

Volume 28 Issue 6

Jun. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(6): 1057-1062

Jie Luo, Xin Li, Fu-jie Zhang, Song Chen, and Ding Ren, Sintering of monoclinic SrAl₂Si₂O₈ ceramics and their Sr immobilization, Int. J. Miner. Metall. Mater., 28(2021), No. 6, pp. 1057-1062. https://doi.org/10.1007/s12613-020-2056-6

Cite this article as:

Jie Luo, Xin Li, Fu-jie Zhang, Song Chen, and Ding Ren, Sintering of monoclinic SrAl2Si2O8 ceramics and their Sr immobilization, Int. J. Miner. Metall. Mater., 28(2021), No. 6, pp. 1057-1062. https://doi.org/10.1007/s12613-020-2056-6

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Research Article

Sintering of monoclinic SrAl₂Si₂O₈ ceramics and their Sr immobilization

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Corresponding author:
Ding Ren E-mail: rending2k@scu.edu.cn
Received: 3 December 2019; Revised: 28 March 2020; Accepted: 30 March 2020; Available online: 3 April 2020

Abstract

Abstract

Monoclinic SrAl₂Si₂O₈ ceramics for Sr immobilization were prepared by a liquid-phase sintering method. The sintering temperature, mineral phase composition, microstructure, flexural strength, bulk density, and Sr ion leaching characteristics of the SrAl₂Si₂O₈ ceramics were investigated. A crystalline monoclinic SrAl₂Si₂O₈ phase formed through liquid-phase sintering at 1223 K. The introduction of four flux agents (B₂O₃, CaO·2B₂O₃, SrO·2B₂O₃, and BaO·2B₂O₃) to the SrAl₂Si₂O₈ ceramics not only reduced the densification temperature and decreased the volatilization of Sr during high-temperature sintering but also impacted the mechanical properties of the ceramics. Product consistency tests showed that the leaching concentration of Sr ions in the sample with flux agent B₂O₃ was the lowest, whereas that of Sr ions in the sample with flux agent BaO·2B₂O₃ was the highest. These results show that the leaching concentration of Sr ions depends largely on the amorphous phase in the ceramics. Meanwhile, the formation of mineral analog ceramics containing Sr is an important factor to improve Sr immobilization.
- low-temperature liquid-phase sintering;
- strontium immobilization;
- monoclinic strontium feldspar;
- flux agent

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