Optical and thermo-mechanical properties of fine-grained transparent yttria ceramics fabricated by hot-press sintering for infrared window applications |
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Authors: | Lin Gan Young-Jo Park Lin-Lin Zhu Ha-Neul Kim Jae-Woong Ko Hai-Doo Kim |
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Affiliation: | 1. Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for Green Preparation and Application of Functional Materials, School of Material Science and Engineering, Hubei University, 368 Youyi Avenue, Wuhan, Hubei 430062, China;2. Engineering Ceramics Department, Korea Institute of Materials Science, 797 Changwondaero, Changwon, Gyeongnam, 641-831, Republic of Korea |
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Abstract: | In this work, highly transparent yttria ceramics Φ?=?55?mm in size were fabricated by a hot-pressing method with 1 at.% ZrO2 or 12 at.% La2O3 as a sintering additive. For a 4-mm-thick specimen doped with ZrO2, the in-line transmittance reaches 71.1% at 400?nm and 80.9% at 1100?nm, and the transmittance of the La2O3-doped specimen is comparable to that of the ZrO2-doped specimen. By means of the relatively low sintering temperature of 1600?°C, the present samples exhibited very fine microstructures (<2?μm), giving rise to excellent mechanical strength levels (~200?MPa). With regard to the 1 at.% ZrO2-doped specimen, the combination of high strength and high thermal conductivity (~10 W/m?K) substantially improved parameters related to the thermal shock resistance. The results of this study indicate that the hot-pressed transparent yttria ceramic doped with 1 at.% ZrO2 is optically, mechanically, and thermally suitable for high-temperature IR window applications. |
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Keywords: | Transparent yttria ceramic IR window Mechanical strength Thermal shock resistance |
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