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Magnesia-zircon brick: Evolution of microstructure, properties and performance with increasing sintering temperature

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Author(s): Gao J. | Guo Z. | Wang L. | Jiang W.

Journal: Science of Sintering
ISSN 0350-820X

Volume: 45;
Issue: 2;
Start page: 181;
Date: 2013;
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Keywords: magnesia-zircon | microstructure | properties | performance

ABSTRACT
Depending on phase components and densification, Magnesia-Zircon brick varies in appearance from white to veined and then brown with increasing sintering temperature. Properties including bulk density, apparent porosity and hot modulus of rupture as well as performance embodied with creep resistance and refractoriness continue to improve with sustaining enhancement of sintering temperature. Exceptionally, cold crushing strength first increases then decreases with rising sintering temperature and a peak exists at 1550oC. Microstructural evolution suffers zircon decomposition companying by silica escape, forsterite formation, matrix solidification and zirconia coagulation, until a zirconia/forsterite composites belt tightly coating on magnesia aggregates. Excessive coagulation of zirconia caused by oversintering probably results in microcracks formation and defects enlargement thereby degrades cold crushing strength.
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