The effect of TiO2 addition on strengthening and toughening in intragranular type of 12Ce-TZP/Al2O3 nanocomposites

Masahiro Nawa, Noriko Bamba, Tohru Sekino, Koichi Niihara

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63 Citations (Scopus)

Abstract

To compensate the definite disadvantages of lower strength and lower hardness in Ce-TZP, an intragranular type of 12Ce-TZP/0-30 vol% Al2O3 nanocomposite was investigated. Furthermore, the effect of TiO2 addition on strengthening and toughening was also examined for the optimum component of 30 vol% Al2O3, which showed a maximum strength of 866 MPa. For these composites, a novel interpenetrated intragranular microstructure was presented, in which either 200-nm-sized Al2O3 particles or 30-50-nm-sized ZrO2 particles were trapped within the ZrO2 grains or Al2O3 grains, respectively. The TiO2 was confirmed to dissolve into the tetragonal ZrO2 lattice, and contributed to the phase stability of the tetragonal phase and the promotion of intragranular nano-dispersion. For the small amount (0-2mol%) of TiO2 doped 12Ce-TZP/30 vol% Al2O3 composite, simultaneous improvements in strength (1012MPa) and toughness (10·2MPa· m1/2 for the IF method, 5·7 MPa· m1/2 for the SEVNB method) were achieved through tailoring the sintering condition.

Original languageEnglish
Pages (from-to)209-219
Number of pages11
JournalJournal of the European Ceramic Society
Volume18
Issue number3
Publication statusPublished - 1998 Dec 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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