TiO_2を添加したAl_2O_3-ZrO_2複合体の微細組織と機械的性質に及ぼす焼成雰囲気の影響(第2報) : TiO_2の添加量の影響

概要

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To improve mechanical properties of TiO_2-added zirconia-toughened alumina(ZTA), ZTA powders containing(Zr, Ti)O_2 were sintered in an atmosphere of N_2+5%H_2. The effect of TiO_2 content on the microstructure and mechanical properties of ZTA was investigated. Experimental results showed that Ti ions diffused to grain boundaries and into Al_2O_3 grains, thereby enhancing the densification of ZTA powders sintered in N_2+5%H_2, but the grain growth of ZTA was less than that of a sample sintered in air. Al_2TiO_5 dispersed in a ZTA sintered body containing ≥5.5 mol% TiO_2 was considered to increase the residual stress. These results indicate that ZTA composites containing TiO_2 sintered in N_2+5%H_2 have superior bending strength and toughness to those sintered in air.
1996-01-01