Effect of micro-sized hydromagnesite addition on the properties of calcium aluminate cement-bonded castables

To assess the viability of micro-sized hydromagnesite as a precursor in refractory castables bonded with calcium aluminate cement, the volumetric stability and thermo-mechanical properties of high-alumina castables containing different micro-sized hydromagnesite amounts (0–1.6 wt%) after firing at 1...

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Bibliographic Details
Published in:Ceramics international 2018-08, Vol.44 (11), p.12973-12977
Main Authors: Hu, Shuhe, Chen, Liugang, Zhu, Lingling, Ding, Dafei, Zhao, Fei, Ye, Guotian
Format: Article
Language:English
Subjects:
Castables
Hydromagnesite
Refractory
Thermo-mechanical properties
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Summary:To assess the viability of micro-sized hydromagnesite as a precursor in refractory castables bonded with calcium aluminate cement, the volumetric stability and thermo-mechanical properties of high-alumina castables containing different micro-sized hydromagnesite amounts (0–1.6 wt%) after firing at 1550 °C were investigated. Phase composition and microstructure evolution in fired castable matrices with different micro-sized hydromagnesite contents were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Dimensional stability, hot modulus of rupture and thermal shock resistance of castables were improved by adding micro-sized hydromagnesite. The microstructure evolution in castable matrix added with micro-sized hydromagnesite was discussed to understand the mechanism of enhanced volume stability and thermo-mechanical properties.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2018.04.114