Abstract
In this study, whether there is a phase change in the zirconia-titania mixture at high sintering temperatures and the effect of mullite additive on the mechanical and especially wear properties of this mixture was investigated. We synthesized mullite and 8 mol % titania added zirconium dioxide (8 mol % titania - 92 mol % zirconia) powders by conventional ceramic production route. We prepared the mixtures in acetone environment by mechanical alloying technique. To synthesize mullite, we prepared Al2O3 and SiO2 powders mixture with stoichiometric proportions and fired in air at 1600 oC for 3 h. Then, we fired titania added zirconia composites at 1300 oC for 2 h. Thus, titania - zirconia and mullite composite phases were obtained and grinding and sieving processes were carried out. Then, we prepared mullite-free and 10% by weight mullite reinforced titanium oxide added zirconia mixtures. The powders were pressed by uniaxial pressing after drying. The formed samples were sintered in a high temperature furnace in air conditions for 1 and 5 h at 1500 and 1600 oC sintering temperatures. Finally, microstructure investigations, phase analysis, 3-point bending, hardness, wear tests, absorption of water, porosity, shrinkage and density results were examined on the composites. It was founded that with titania and mullite adding to zirconia matrix, there was not define a new phase in the composite microstructure. But mullite additive increased the wear resistance, hardness and three-point bending strength of the titania-zirconia composites.
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