Enhanced Densification and Grain-Size Refinement in Cation-Doped Tetragonal Zirconia

Author:

Hiraga Keijiro1,Yoshida Hidehiro2,Morita Koji3,Kim Byung Nam3

Affiliation:

1. National Institute for Material Science

2. National Institute for Materials Science

3. National Institute for Materials Science (NIMS)

Abstract

In tetragonal zirconia, possibility is investigated of densification with finer grain sizes under the combination of doping and sintering in air. The materials used are CIP'ed compacts of 3-mol%-yttria-stabilized tetragonal zirconia (3Y-TZP) doped with a small amount of cations. For a given sintering temperature and initial density of the compacts, while the doped cations enhances densification in the latest stage of sintering, the effect is different in grain growth during densification: a doped cation tended to enhance grain growth, whereas the other cations tended to suppress grain growth. As a result, the doping of the latter cations brings about a grain size finer than that of the undoped 3Y-TZP for a given relative density.

Publisher

Trans Tech Publications Ltd

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