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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

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