Thermal stability and mechanical properties of yttria-doped tetragonal zirconia polycrystals with dispersed alumina and silicon carbide particles

T. Sato, H. Fujishiro, T. Endo, M. Shimada

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Yttria-doped tetragonal zirconia polycrystals in which were dispersed various amounts of Al2O3 and SiC particles were sintered at 1500° C for 3 h, and the mechanical properties and the thermal stability of the sintered bodies were evaluated. Dispersion of Al2O3 caused no significant effect on sinterability, and increased the hardness and elasticity of the composites. Dispersion of SiC particles decreased the relative density and the grain size of composites. Elasticity and hardness increased by dispersing less than 10 vol% SiC, but decreased above 10 vol% SiC due to the decrease of relative density. Dispersion of both Al2O3 and SiC particles slightly increased the fracture toughness of ZrO2-3 mol% Y2O3 ceramics but significantly decreased that of ZrO2-2 mol% Y2O3 ceramics. The rate of the tetragonal-to-monoclinic phase transformation decreased by dispersing both Al2O3 and SiC particles. The transformation depth increased rapidly and then slowly with increasing the annealing time. The rate of increase in the transformation depth greatly decreased by dispersing Al2O3 particles.

Original languageEnglish
Pages (from-to)882-886
Number of pages5
JournalJournal of Materials Science
Volume22
Issue number3
DOIs
Publication statusPublished - 1987 Mar 1

ASJC Scopus subject areas

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

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