Abstract
To improve mechanical properties of TiO2-added zirconia-toughened alumina (ZTA), ZTA powders containing (Zr, Ti) O2 were sintered in an atmosphere of N2+5%H2. The effect of TiO2 content on the microstructure and mechanical properties of ZTA was investigated. Experimental results showed that Ti ions diffused to grain boundaries and into Al2O3 grains, thereby enhancing the densification of ZTA powders sintered in N2+5%H2, but the grain growth of ZTA was less than that of a sample sintered in air. Al2TiO5 dispersed in a ZTA sintered body containing ≥5.5mol% TiO2 was considered to increase the residual stress. These results indicate that ZTA composites containing TiO2 sintered in N2+5%H2 have superior bending strength and toughness to those sintered in air.
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