Microstructure and mechanical properties of Y2O3 stabilized tetragonal zirconia based nanocomposites incorporating metal dispersions

Masahiro Nawa, Keiichi Yamazaki, Tohru Sekino, Koichi Niihara

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Yttria stabilized tetragonal zirconia polycrystal (Y-TZP)/0-100 vol% molybdenum (Mo) composites were fabricated by hot-pressing a mixture of Y-TZP powder containing 3 mol% yttria and a fine Mo powder in vacuum. This composite system possessed a novel microstructural feature composed of a mutual intragranular nanostructure, in which either nanometer sized Mo particles or equivalent sized zirconia particles were located within the zirconia grains or Mo grains, respectively. Both fracture strength and toughness increased with increasing Mo content. They achieved a simultaneous improvement in strength and toughness that overcame the strength-toughness tradeoff relation. A maximum fracture strength of 2100 MPa was obtained at 70 vol% Mo content. Moreover, a fracture toughness increased dramatically with increasing Mo content above 40 vol% and exhibited 18.0 MPa·m1/2 at above 50 vol% Mo content. The relation between microstructure and mechanical properties will be discussed.

Original languageEnglish
Pages (from-to)1220-1225
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume41
Issue number10
Publication statusPublished - 1994 Oct

ASJC Scopus subject areas

  • Mechanical Engineering
  • Metals and Alloys

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