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

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

Research output: Contribution to journalConference article

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)645-648
Number of pages4
JournalKey Engineering Materials
Volume206-213
Issue numberI
Publication statusPublished - 2001 Jan 1
Event7th Conference of the European Ceramic Society - Brugge, Belgium
Duration: 2001 Sep 92001 Sep 13

Keywords

  • Colloidal processing
  • Fine-grained ceramics
  • Superplasticity
  • Tetragonal zirconia

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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