Structure,thermal properties and hot corrosion behaviors of Gd2Hf2O7 as a potential thermal barrier coating material |
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| Affiliation: | 1. School of Material Science and Engineering, Nanchang Hangkong University, Jiangxi 330063, China;2. Jiangxi Provincial Engineering Research Center for Surface Technology of Aeronautical Materials, Nanchang Hangkong University, Jiangxi 330063, China;3. Department of Science and Technology Engineering, AECC South Industry Co. Ltd., Hunan 412002, China;4. School of Material Science and Engineering, Hunan University, Hunan 410082, China;1. Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China;2. School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China;1. School of Engineering and Technology, China University of Geosciences, Beijing, 100083, China;2. Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing, 100076, China;3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China |
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| Abstract: | In this work, Gd2Hf2O7 ceramics were synthesized and investigated as a potential thermal barrier coating (TBC) material. The phase composition, microstructure and associated thermal properties of Gd2Hf2O7 ceramics were characterized systematically. Results show that the thermal conductivity of Gd2Hf2O7 ceramics is 1.40 Wm?1K?1 at 1200 °C, ~25% lower than that of 8 wt% yttria partially stabilized zirconia (8YSZ). Gd2Hf2O7 ceramics also present large thermal expansion coefficients, which decrease from 12.0 × 10?6 K?1 to 11.3 × 10?6 K?1 (300–1200 °C). Besides, the hot corrosion behaviors of Gd2Hf2O7 ceramics exposed to V2O5 and Na2SO4 + V2O5 salts at temperatures of 900–1200 °C were discussed in great detail. We pay much attention on the corrosion process, corrosion mechanism and corrosion damage of Gd2Hf2O7 ceramics subjected to molten V2O5 and Na2SO4 + V2O5 salts at different temperatures. |
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| Keywords: | Thermal barrier coating (TBC) Structure Thermal properties Hot corrosion behaviors |
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