Colloidal processing and superplastic proprties of fine-grained zirconia-based ceramics

Y. Sakka*, T. S. Suzuki, K. Morita, K. Hiraga


研究成果: Conference article査読

7 被引用数 (Scopus)


Colloidal processing was applied to obtain dense and homogeneous yttria-doped tetragonal zirconia (YTZ), alumina-dispersed YTZ, and magnesia- and titania-doped YTZ. Their slurries were prepared by adding appropriate amounts of polyelectrolyte, and their fine-grained bodies were obtained through slip casting, cold isostatic pressing and low-temperature sintering. The obtained bodies show excellent superplastic properties. In particular alumina addition was found to (1) decrease the limit temperature of superplasticity in YTZ to 1573 K or lower, (2) increase the limit strain rate for large elongation exceeding 300% up to 1.2×10-2 s-1 at 1573 K and (3) large tensile elongation exceeding 1000% at 1.7×10-4 s-1. The effects of microstructure such as grain size, grain-boundary structure and cavity density on the superplastic properties are discussed by comparison with the conventionally prepared samples. The creep parameters prepared by the colloidal processing were similar to those prepared by conventional dry processing. Their excellent superplasticities are due to the reduction of residual defects, fine-grained and homogeneous microstructures.

ジャーナルKey Engineering Materials
出版ステータスPublished - 2001 1月 1
イベント7th Conference of the European Ceramic Society - Brugge, Belgium
継続期間: 2001 9月 92001 9月 13

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学


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