Investigation on Clay Based Mullite-silica Rich Glass Composites

doi:10.19691/j.cnki.1004-4493.2025.01.003

China's Refractories ›› 2025, Vol. 34 ›› Issue (1): 18-24.DOI: 10.19691/j.cnki.1004-4493.2025.01.003

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Investigation on Clay Based Mullite-silica Rich Glass Composites

YAN Wen^{1, 2*}, SHI Jinling¹, LI Nan¹

1 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2 Joint International Research Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

Online:2025-03-15 Published:2025-03-27
Contact: *e-mail: yanwen@wust.edu.cn
About author:Yan Wen, is a professor and doctoral supervisor at Wuhan University of Science and Technology now. His researches focus on the refractories as well as the ceramic foam filters. He has led four National Natural Science Foundation of China (NSFC) projects, four Hubei Provincial Natural Science Foundation projects, as well as 17 enterprise-university collaborative projects with industry leaders such as China Baowu Steel Group Co., Ltd. and Puyang Refractories Group Co., Ltd. Additionally, he has participated in 39 research projects, including NSFC projects and enterprise-university collaborative projects. He has published 191 academic papers, including 135 SCI-indexed articles, and holds 69 Chinese invention patents. Meanwhile, he was also rewarded the Outstanding Reviewer Award, Best Paper Award, and Alfred W. Allen Award from the American Ceramic Society.

Abstract

Abstract: Mullite-silica rich glass (MSRG) composites are a more efficient material than chamotte for industrial utilization of clay in refractory applications. The properties of the MSRG composites depend on the amount and composition of the mullite and glass phases, which are related to the chemical composition of the MSRG composites based on clay. In the present work, the relationship between the phase and the chemical composition of the MSRG composites, and the effects of the chemical composition of the glass phase on the viscosity and coefficient of thermal expansion (CTE) of the glass phase were discussed on the basis of the measurements on 17 MSRG composite samples produced from clay. It is found that the Al₂O₃/SiO₂ratio (A/S ratio) in clay strongly affects the amount of the mullite and glass phases in the MSRG composites, and the distributions of SiO₂, TiO₂ and Fe₂O₃ contents in the mullite and glass phases. With the increase of the A/S ratio of clay, the mullite content increases but the the glass phase content decreases in the MSRG composites. The viscosity and CTE of the glass phase depend on its A/S ratio and the amount of impurity oxides. When the A/S ratio in the glass phase is less than 0.15, the viscosity of the liquid formed by the melting of the glass phase at elevated temperatures rapidly increases with the decrease in the A/S ratio. The CTE of the glass phase depends on the contents of SiO₂ and (K₂O+Na₂O).

Key words: mullite-silica rich glass composite, composition, glass phase, viscosity, coefficient of thermal expansion

YAN Wen, SHI Jinling, LI Nan. Investigation on Clay Based Mullite-silica Rich Glass Composites[J]. China's Refractories, 2025, 34(1): 18-24.

References

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Investigation on Clay Based Mullite-silica Rich Glass Composites

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