Effect of TiO2 as an Additive on the Phase Formation and Densification of Mullite-Zircona Composites

Abstract

Mullite-Zirconia composite was prepared from reaction sintering of zircon sand and alumina with different percentages of titanium dioxide. The mixture was uniaxially compacted and sintered at 1500⁰C, 1550oC and 1650oC with 4hrs. soaking time. The density, biaxial flexure strength and XRD were carried out on different sintered samples. Maximum density and approximate zero porosity was achieved at 1600oC in sample containing 0.2% TiO2. Addition of additive increased the biaxial flexural strength of the zirconia-mullite composites.