Preparation and characterization of mullite/zirconia and spinel/zirconia composites

Two types of refractory ceramic composites, namely mullite/zirconia and spinel/zirconia were prepared equimoleculary and investigated through their mineralogical composition and microstructure using XRD and SEM. Densification, mechanical and refractory properties were studied and correlated with their compositions and microstructures. Both composite samples show superior properties, especially after firing at 1600^oC due to the high densification and well texture. However, the properties of spinel/zirconia are more outstanding. These advantages of such composites have widely recognized them for producing materials for refractory ceramics and engineering applications.