Effect of cation doping on mechanical properties of yttria prepared by an optimized two-step sintering process

Hadi Razavi Khosroshahi, Hiroyuki Ikeda, Kazuhiro Yamada, Noritaka Saito, Kenji Kaneko, Koichi Hayashi, Kunihiko Nakashima

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Undoped Y 2 O 3 and Y 2 O 3 doped with either Si 4+ , Er 3+ , Yb 3+ , Al 3+ or Ti 4+ were fabricated by a two-step sintering method. The concentration of each dopant cation (Si 4+ , Er 3+ , Yb 3+ , Al 3+ , and Ti 4+ ) was adjusted so that the dopant:yttria molar ratio was 0.01 and the mechanical properties and the microstructures of each were characterized. The Vickers hardness and the bending strength of cation-doped Y 2 O 3 increased in the order Si 4+ , Er 3+ , Yb 3+ , Al 3+ , and Ti 4+ paralleling increases in the relative density. Ti-doped-Y 2 O 3 had the highest density and the highest strength. Transmission electron microscopy analysis revealed that Ti segregated to the grain boundaries of Y 2 O 3 . The two-step sintering method was optimized to enhance the mechanical properties of Y 2 O 3 . As a consequence, Ti-doped Y 2 O 3 with the Ti 4+ :yttria molar ratio of 0.01 sintered at the optimized heating schedule was found to have a Vickers hardness and three-point bending strength as high as 874 Hv and 307.0 MPa, respectively.

Original languageEnglish
Pages (from-to)3263-3269
Number of pages7
JournalJournal of the American Ceramic Society
Volume95
Issue number10
DOIs
Publication statusPublished - Oct 1 2012

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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