Microstructural, mechanical, and electrical characteristics of alumina-reinforced ytterbia-stabilized cubic zirconia-based composites

Masashi Wada, Tohru Sekino, Takafumi Kusunose, Tadachika Nakayama, Koichi Niihara

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Al2O3-dispersed Yb2O3-stabilized cubic-ZrO2 (YbSZ) composites are fabricated by pressureless sintering of composite powders to obtain fine and homogeneous microstructures by the solution chemistry route. Al2O3 particles are deposited on ZrO2 powders by the precipitation of aluminum nitrate followed by calcination in air. The sinterability of the composites was affected by the calcination temperature. Microstructures of the sintered bodies are dependent on the Al2O3 content. For the 5 vol% Al2O3-dispersed composite, fine Al2O3 particles were mainly located inside the grains of zirconia, whereas relatively large Al2O3 particles almost dispersed at the grain boundaries when the Al2O3 content was increased. The grain growth of YbSZ was suppressed by the Al2O3 addition, and the refinement of the matrix grain improved the fracture strength of YbSZ. The YbSZ and YbSZ/Al2O3 composites exhibited almost similar ionic conductivity at high temperatures of around 1000 °C.

Original languageEnglish
Pages (from-to)1455-1460
Number of pages6
JournalJournal of Materials Research
Volume19
Issue number5
DOIs
Publication statusPublished - 2004 May 1

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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