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Journal of Ceramic Science and Technology

The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of  the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.

The Journal is published by Göller Verlag GmbH on behalf of the Deutsche Keramische Gesellschaft (DKG). Edited by Yu-Ping Zeng, Shanghai Institute of Ceramics, Chinese Academy of Sciences, China.

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Microstructure and Phase Evolution of Cement-Bonded High-Alumina Refractory Castables for Porous Purging Plugs

Q. Wang, Y. Li, N. Xu, R. Xiang, S. Li

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology (WUST), Wuhan 430081, China

received June 25, 2017, received in revised form August 15, 2017, accepted September 6, 2017

Vol. 9, No. 1, Pages 1-6   DOI: 10.4416/JCST2017-00044

Abstract

This work addresses the microstructure and phase evolution of four designed high-alumina refractory castables (containing ρ-Al2O3 or calcium aluminate cement as a binder source and 0 or 1 wt% microsilica). Various experimental tests (air permeability, linear change rate, apparent porosity, cold modulus of rupture, cold crushing strength, hot modulus of rupture, pore size distribution, X-ray diffraction and scanning electron microscopy) were conducted to characterize the castables. The results show that using cement as the binder has a significant effect on the properties of the refractory castables. The cement-bonded castables exhibited a lower linear shrinkage rate, apparent porosity and air permeability, higher cold modulus of rupture and cold crushing strength, as well as a smaller mean pore size than that of the ρ-Al2O3-bonded castables. The results were attributed to the formation of calcium hexaluminate. Some CA6 was detected inside the pores, which occupied space in the pores and prevented the formation of interconnected pores, while some CA6 existed outside the pores, which enhanced the densification of the structure and reduced the size of pores. Moreover, the addition of microsilica can facilitate interconnected pore formation in cement-bonded castables, but lower the hot modulus of rupture owing to the formation of low-melting-temperature phase (C2AS).

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Keywords

Cement, porous purging plug, microstructure, phase evolution, pore size distribution

References

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