The Comparison of MgO and TiO۲ Additives Role on Sintering Behavior and Microstructures of Reaction-Sintered Alumina-Zirconia-Mullite Composite

Alumina-Mullite-Zirconia ceramic composites were prepared by reaction sintering of alumina, zircon mixture and the sintering aids of magnesia and titania at temperatures of ۱۴۰۰ and ۱۶۰۰ C for ۲ hours. The development of different phases and microstructures of the composites were analysed to assess the relative influence of the additives on the formation of alumina-zirconia-mullite composite. Bulk density, phase combination, and microstructure of the sintered samples were examined by Archimedes method, X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. The results of the study revealed the successful formation of the alumina-mullite-zirconia composite by the reaction sintering method at temperature of ۱۶۰۰C. By the same token, the sample containing ۶ wt.% of sintering aid shows improvement in density.