Fabrication and mechanical properties of CeO2 stabilized tetragonal zirconia based nanocomposites incorporating Al2O3 dispersions

Masahiro Nawa, Syoichi Nakamoto, Keiichi Yamazaki, Tohru Sekino, Koichi Niihara

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

To compensate the definite disadvantages of ceria stabilized tetragonal zirconia polycrystal (Ce-TZP) as compared to Y-TZP ceramics, such as lower strength and lower hardness, we applied the idea of the nanocomposite to Ce-TZP/Al2O3 composite system. Zirconia matrix in these composites consisted of primarily the tetragonal phase and a small amount of the monoclinic phase. These composites partly possessed an intragranular nanostructure, in which fine alumina particles were trapped within the zirconia grains. At an optimum component for the 10Ce-TZP/30 vol% Al2O3 composite sintered at 1500°C, strength of 730 MPa and very high toughness of 10.2 Mpa·m1/2(SEPB) were achieved. This toughness value was in excess of that (8.1 MPa·m1/2) of WC/Co cermet. Therefore, it is suggested that this composite system would be expected as candidate for an attractive TZP ceramics, which have advantages of both high strength in Y-TZP and high toughness in Ce-TZP along with high resistance to low-temperature degradation.

Original languageEnglish
Pages (from-to)415-420
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume43
Issue number4
DOIs
Publication statusPublished - 1996 Apr

Keywords

  • Ce-TZP/Al2O3 system
  • Mechanical properties
  • Nanocomposite
  • Pressureless sintering

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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