Grain boundary diffusion driven spark plasma sintering of nanocrystalline zirconia

Hanna Borodianska, Dmytro Demirskyi, Yoshio Sakka, Petre Badica, Oleg Vasylkiv

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

A methodology is proposed to investigate in detail shrinkage kinetics under isothermal spark plasma sintering (SPS) conditions applied to ceramic nano powders such as Y 2O 3 stabilized ZrO 2. To do so, mild SPS conditions were used (low temperatures and pressure, long dwell times). The extracted experimental activation energy has the value of 246 ± 37 kJ mol -1 and the slope of the curves on the intense densification stage is around 0.33. Results are in agreement with densification by a grain-boundary diffusion mechanism as for conventional sintering and the contribution from the specific pressure-assisted mechanisms as for hot pressing is insignificant. This result suggests that exploration of mild SPS might prove rewarding in separation and control of the sintering mechanisms leading to production of specific ceramic with new or improved functionality.

Original languageEnglish
Pages (from-to)4385-4389
Number of pages5
JournalCeramics International
Volume38
Issue number5
DOIs
Publication statusPublished - 2012 Jul 1
Externally publishedYes

Keywords

  • Activation energy
  • Grain boundary diffusion
  • Nanopowder
  • Sintering kinetic
  • Spark plasma sintering
  • Zirconia

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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