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Effect of Cation Doping on Mechanical Properties of Yttria Prepared by an Optimized Two‐Step Sintering Process

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Undoped Y2O3 and Y2O3 doped with either Si4+, Er3+, Yb3+, Al3+ or Ti4+ were fabricated by a two‐step sintering method. The concentration of each dopant cation (Si4+, Er3+, Yb3+, Al3+, and Ti4+) 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 Y2O3 increased in the order Si4+, Er3+, Yb3+, Al3+, and Ti4+ paralleling increases in the relative density. Ti‐doped‐Y2O3 had the highest density and the highest strength. Transmission electron microscopy analysis revealed that Ti segregated to the grain boundaries of Y2O3. The two‐step sintering method was optimized to enhance the mechanical properties of Y2O3. As a consequence, Ti‐doped Y2O3 with the Ti4+: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

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