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Effect of Cation Doping on Mechanical Properties of Yttria Prepared by an Optimized Two‐Step Sintering Process
Author(s) -
Khosroshahi Hadi Razavi,
Ikeda Hiroyuki,
Yamada Kazuhiro,
Saito Noritaka,
Kaneko Kenji,
Hayashi Koichi,
Nakashima Kunihiko
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2012.05379.x
Subject(s) - materials science , vickers hardness test , dopant , sintering , microstructure , doping , yttria stabilized zirconia , flexural strength , relative density , scanning electron microscope , analytical chemistry (journal) , transmission electron microscopy , composite material , metallurgy , nanotechnology , ceramic , cubic zirconia , chemistry , optoelectronics , chromatography
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.