Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7898035 | Journal of the European Ceramic Society | 2018 | 21 Pages |
Abstract
Sintering-additive-free fine-grained highly transparent Y2O3 ceramics featuring record-high thermal shock resistance were fabricated using commercial powders via vacuum pre-sintering (1375-1550â¯Â°C) followed by hot-isostatic pressing (1450â¯Â°C). The sample pre-sintered at 1450â¯Â°C provides the optimum microstructure for post HIPing, which resulted in a grain size of 0.64â¯Î¼m. The transmittance, microhardness and fracture toughness of the thus HIPed sample are 80.8% at 1100â¯nm and 65.5% at 400â¯nm (1.2â¯mm thick), 8.0â¯Â±â¯0.02â¯GPa and 1.00â¯Â±â¯0.06â¯MPaâ¯m1/2, respectively. The thermal conductivity increases from 13.1 to 16.5â¯W/m/K with increasing vacuum pre-sinterin Proc. SPIE-Int. Soc. Opt g temperature from 1450 to 1550â¯Â°C. This hybrid sintering method realized high thermal conductivity and high strength simultaneously. Consequently, the thermal shock resistance of the HIPed specimen vacuum pre-sintered at 1450â¯Â°C in this work is the highest ever reported to the best of our knowledge, which makes the developed material a promising candidate for high-power laser host and IR dome.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Lin-Lin Zhu, Young-Jo Park, Lin Gan, Ha-Neul Kim, Jae-Woong Ko, Hai-Doo Kim,