Effect of starting powders on the sintering of nanostructured

Gustavo Suárez, Yoshio Sakka, Tohru S. Suzuki, Tetsuo Uchikoshi, Xinwen Zhu, Esteban F. Aglietti

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The effect of starting powders on the sintering of nanostructured tetragonal zirconia was evaluated. Suspensions were prepared with a concentration of 10 vol.% by mixing a bicomponent mixture of commercial powders (97 mol.% monoclinic zirconia with 3 mol.% yttria) and by dispersing commercially available tetragonal zirconia (3YTZ, Tosoh). The preparation of the slurry by bead-milling was optimized. Colloidal processing using 50 μm zirconia beads at 4000 rpm generated a fully deagglomerated suspension leading to the formation of high-density consolidated compacts (62% of the theoretical density (TD) for the bicomponent suspension). Optimum colloidal processing of the bicomponent suspension followed by the sintering of yttria and zirconia allowed us to obtain nanostructured tetragonal zirconia. Three different sintering techniques were investigated: normal sintering, two-step sintering and spark plasma sintering. The inhibition of grain growth in the bicomponent mixed powders in comparison with 3YTZ was demonstrated. The inhibition of the grain growth may have been caused by inter-diffusion of cations during the sintering.

Original languageEnglish
Article number025004
JournalScience and Technology of Advanced Materials
Volume10
Issue number2
DOIs
Publication statusPublished - 2009 Aug 19
Externally publishedYes

Keywords

  • Colloidal processing
  • Nanostructured zirconia
  • Spark plasma sintering (SPS)
  • Two-step sintering

ASJC Scopus subject areas

  • Materials Science(all)

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