Mechanical Properties of 3Y-ZrO2/Ni Composites Prepared by Reductive Sintering

H. Kondo, T. Sekino, Y. H. Choa, K. Niihara

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


3Y-ZrO2/Ni composites were fabricated by reductive hot-pressing from 3Y-ZrO2/NiO powder mixtures, which prepared by wet ball-milling. Reduction was carried out in H2 atmosphere at 700°C, and the powder mixtures were continuously hot-press sintered at 1500°C and 1600°C. X-ray diffraction analysis showed that all NiO transformed to Ni, and the sintered composites consisted of only tetragonal zirconia and metallic Ni. Neither monoclinic zirconia nor other reaction phase was existed. The three-point bending strength of over 1.9 GPa was achieved by dispersing only 1 and 2 vol% of Ni. The fracture toughness of 10 vol% Ni composite was 6.1 MPam1/2. It was found that the fracture strength increased and then deceased with the Ni addition, while the toughness monotonously increased with increasing Ni addition.

Original languageEnglish
Pages (from-to)419-422
Number of pages4
JournalKey Engineering Materials
Publication statusPublished - 1999 Jan 1
Externally publishedYes


  • Mechanical Properties
  • Microstructure
  • Nanocomposite
  • Nickel
  • Reduction and Sintering
  • Zirconia

ASJC Scopus subject areas

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


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