Effect of waste-derived MA spinel on sintering and stabilization behavior of partially stabilized double phase zirconia

摘要

Cubic-stabilized zirconia ceramic composites have been synthesized by conventional sintering, starting from commercial m-ZrO2, Y2O3, and waste-derived magnesium aluminate spinel (MA) powders. In this work, the effect of sintering temperature and MA content on stabilization and densification properties of YSZ have been duly considered. MA-free YSZ0 composite sintered at 1600 degrees C-1700 degrees C revealed m- and t-ZrO(2)dual-phase structure where its m-ZrO(2)was partially stabilized upon temperature rising into tetragonal phase by Y(3+)diffusion inside zirconia structure. YSZ10-50 composites containing 10-50 wt% MA demonstrated dissimilar behavior where their m-ZrO(2)was transformed and stabilized into a cubic form by diffusion of Y3+, Mg+2, and Al(+3)inside zirconia lattice. Furthermore, densification of YSZ10-50 powder mixtures by conventional sintering at 1600 degrees C for 2 hours resulted in fully dense compacts with micrometer-sized grains. The outcomes indicate that MA has a significant effect on m-ZrO(2)stabilization into the cubic phase structure at room temperature. In this respect, this study offers huge potentials for developing fully stabilized c-ZrO(2)ceramics that could be possibly used as industrial ceramics for structural applications of harsh chemical and thermal environmental conditions.