Abstract
To improve mechanical properties of TiO2-added zirconia-toughened alumina (ZTA), the microstructure and sinterability of ZTA composites fabricated from ZTA powders containing (Zr, Ti)O2 and sintered in an atmosphere of N2+5%H2 were investigated. In the sintered ZTA, the concentration of Ti in grains of Al2O3 or (Zr, Ti)O2, was analyzed with EDS attached to an AEM apparatus. Experimental results indicated that some Ti ions diffused to the grain boundary and into Al2O3 grains, thereby enhancing the densification of ZTA powders sintered in N2+5%H2, the grain growth is less than that of powders sintered in air. The solubility of TiO2 in (Zr, Ti)O2 in ZTA sintered in N2+5%H2 was smaller than that of ZTA sintered in air, which diminished the tetragonal zirconia phase in the ZTA sintered body.
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