Effect of Cation Doping on Mechanical Properties of Yttria Prepared by an Optimized Two‐Step Sintering Process
2 Y 3 and O 2 Y 3 doped with either O 4+,
Si 3+, Er 3+, Yb 3+ or Al 4+ were fabricated by a two‐step sintering method.
The concentration of each dopant cation ( Ti 4+, Si 3+, Er 3+, Yb 3+, and Al 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 Ti 2 Y 3
increased in the order O 4+, Si 3+, Er 3+, Yb 3+, and Al 4+
paralleling increases in the relative density. Ti ‐doped‐ Ti 2 Y 3 had the highest density and the highest strength. Transmission electron
microscopy analysis revealed that O segregated to the grain boundaries of Ti 2 Y 3. The two‐step sintering method was optimized to enhance
the mechanical properties of O 2 Y 3. As a consequence, O ‐doped Ti 2 Y 3
with the O 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.
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Document Type: Research Article
Publication date: October 1, 2012