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Effects of TiO2 on the microstructure and mechanical properties of Al2O3/ZrO2 composites

Published online by Cambridge University Press:  31 January 2011

Chii-Shyang Hwang  and
Yu-Jing Chang
Chii-Shyang Hwang*
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan, Republic of China
Yu-Jing Chang
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan, Republic of China
*
a) Address all correspondence to this author.
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Abstract

The microstructure and mechanical properties of hot-pressed zirconia-toughened alumina (ZTA), fabricated from the ZTA powders containing (Zr, Ti)O2 in Ar gas were investigated. In hot-pressed ZTA, the presence of Ti concentration in the grains of Al2O3 or (Zr, Ti)O2 was analyzed by the energy dispersive spectroscopy (EDS) attached to the analytical electron microscope (AEM) apparatus. Experimental results showed that some Ti ions diffused to the grain boundary and into the Al2O3 grains, thereby enhancing the densification of hot-pressed ZTA. It was possible to retain tetragonal ZrO2 at room temperature in the ZTA specimens containing ≥5.5 mol% TiO2 and hot pressed at 1350 °C for 1 h. The bending strength and toughness of hot-pressed ZTA were enhanced by the addition of TiO2.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 6 , June 1996 , pp. 1545 - 1551
Copyright
Copyright © Materials Research Society 1996

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