Microstructure and properties of mullite-based porous ceramics produced from coal fly ash with added Al<sub>2</sub>O<sub>3</sub>

Jian-bin Zhu; Hong Yan

doi:10.1007/s12613-017-1409-2

Volume 24 Issue 3

Mar. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(3): 309-315

Jian-bin Zhu and Hong Yan, Microstructure and properties of mullite-based porous ceramics produced from coal fly ash with added Al₂O₃, Int. J. Miner. Metall. Mater., 24(2017), No. 3, pp. 309-315. https://doi.org/10.1007/s12613-017-1409-2

Cite this article as:

Jian-bin Zhu and Hong Yan, Microstructure and properties of mullite-based porous ceramics produced from coal fly ash with added Al2O3, Int. J. Miner. Metall. Mater., 24(2017), No. 3, pp. 309-315. https://doi.org/10.1007/s12613-017-1409-2

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Research Article

Microstructure and properties of mullite-based porous ceramics produced from coal fly ash with added Al₂O₃

Jian-bin Zhu^1,2 and
Hong Yan^1,

+ Author Affiliations

Corresponding author:
Hong Yan E-mail: hyan@ncu.edu.cn
Received: 11 July 2016; Revised: 1 November 2016; Accepted: 2 November 2016

Abstract

Abstract

Using coal fly ash slurry samples supplemented with different amounts of Al₂O₃, we fabricated mullite-based porous ceramics via a dipping-polymer-replica approach, which is a popular method suitable for industrial application. The microstructure, phase composition, and compressive strength of the sintered samples were investigated. Mullite was identified in all of the prepared materials by X-ray diffraction analysis. The microstructure and compressive strength were strongly influenced by the content of Al₂O₃. As the Al/Si mole ratio in the starting materials was increased from 0.84 to 2.40, the amount of amorphous phases in the sintered microstructure decreased and the compressive strength of the sintered samples increased. A further increase in the Al₂O₃ content resulted in a decrease in the compressive strength of the sintered samples. The mullite-based porous ceramic with an Al/Si molar ratio of 2.40 exhibited the highest compressive strength and the greatest shrinkage among the investigated samples prepared using coal fly ash as the main starting material.
- porous materials;
- ceramics;
- fly ash;
- mullite;
- aluminum oxide

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