期刊
CERAMICS INTERNATIONAL
卷 46, 期 13, 页码 21367-21377出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.05.234
关键词
Gd2Hf2O7; Thermal barrier coating (TBC); Structure; Thermal properties; Hot corrosion behaviors
资金
- National Natural Science Foundation of China [11775102, 11805088]
- Youth Innovation Promotion Association for the Chinese Academy of Sciences [2014378]
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(-1) K(-1 )at 1200 degrees C, similar to 25% lower than that of 8 wt% yttria partially stabilized zirconia (8YSZ). Gd(2)Hf(2)O(7 )ceramics also present large thermal expansion coefficients, which decrease from 12.0 x 10(-6) K-1 to 11.3 x 10(-6) K-1 (300-1200 degrees C). Besides, the hot corrosion behaviors of Gd(2)Hf(2)O(7 )ceramics exposed to V2O5 and Na2SO4 + V2O5 salts at temperatures of 900-1200 degrees 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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