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Effect of alumina-doping on grain boundary segregation-induced phase transformation in yttria-stabilized tetragonal zirconia polycrystal

Published online by Cambridge University Press:  03 March 2011

Koji Matsui ,
Nobukatsu Ohmichi ,
Michiharu Ohgai ,
Hidehiro Yoshida  and
Yuichi Ikuhara
Koji Matsui*
Affiliation:
Synthetic Chemicals Production, Tosoh Corporation, Shunan, Yamaguchi 746-8501, Japan
Nobukatsu Ohmichi
Affiliation:
Synthetic Chemicals Production, Tosoh Corporation, Shunan, Yamaguchi 746-8501, Japan
Michiharu Ohgai
Affiliation:
Synthetic Chemicals Production, Tosoh Corporation, Shunan, Yamaguchi 746-8501, Japan
Hidehiro Yoshida
Affiliation:
National Institute for Materials Science, Tsukuba, Ibaraki 305-0047 Japan
Yuichi Ikuhara
Affiliation:
Institute of Engineering Innovation, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
*
a) Address all correspondence to this author. e-mail: k_matui@tosoh.co.jp
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Abstract

The microstructure in a small amount of Al2O3-doped Y2O3-stabilized tetragonal zirconia polycrystal (Y-TZP) sintered at 1100–1650 °C was examined to clarify the effect of Al3+ ions segregated at grain boundaries on cubic-formation and grain-growth processes. The sintering rate in Y-TZP was remarkably enhanced by Al2O3-doping. In addition, at temperatures >1500 °C, grain growth remarkably proceeded, and the fraction of the cubic phase increased in comparison with that of undoped Y-TZP. High-resolution electron microscopy and nanoprobe x-ray energy dispersive spectroscopy measurements revealed that no amorphous layer existed along the grain-boundary faces in Al2O3-doped Y-TZP and that Y3+ and Al3+ ions segregated at grain boundaries over widths of ∼10 and ∼6 nm, respectively. At 1100 °C, Al3+ ions started to segregate at grain boundaries, and the segregation peak of Al3+ ions increased as the sintering temperature increased. Cubic-formation and grain-growth behaviors in Al2O3-doped Y-TZP were reasonably interpreted by taking into account the effect of Al3+ ions segregating along grain boundaries.

Keywords

Grain boundariesMicrostructurePhase transformation
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 9 , September 2006 , pp. 2278 - 2289
Copyright
Copyright © Materials Research Society 2006

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