Structure, thermal properties and hot corrosion behaviors of Gd2Hf2O7 as a potential thermal barrier coating material
Structure, thermal properties and hot corrosion behaviors of Gd2Hf2O7 as a potential thermal barrier coating material
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Gd2Hf2O7作为潜在热障涂层材料的结构、热性能和热腐蚀行为
DOI：
10.1016/j.ceramint.2020.05.234
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发表时间：
2020
影响因子：
5.2
通讯作者：
Chen Jianmin
中科院分区：
文献类型：
--
作者：
Yang Pan;An Yulong;Yang Dongyan;Li Yuhong;Chen Jianmin
在这项工作中，合成并研究了 Gd2Hf2O7 陶瓷作为潜在的热障涂层（TBC）材料。对 Gd2Hf2O7 陶瓷的相组成、微观结构和相关热性能进行了系统表征。结果表明，Gd2Hf2O7 陶瓷在 1200 °C 时的导热率为 1.40 Wm−1K−1，比 8 wt% 氧化钇部分稳定氧化锆 (8YSZ) 低约 25%。 Gd2Hf2O7陶瓷还具有较大的热膨胀系数，从12.0×10−6K−1降低到11.3×10−6K−1（300-1200°C）。此外，还详细讨论了 Gd2Hf2O7 陶瓷在 900–1200 °C 温度下暴露于 V2O5 和 Na2SO4+ V2O5 盐的热腐蚀行为。我们重点研究了Gd2Hf2O7陶瓷在不同温度下熔融V2O5和Na2SO4+ V2O5盐中的腐蚀过程、腐蚀机理和腐蚀损伤。
In this work, Gd2Hf2O7ceramics were synthesized and investigated as a potential thermal barrier coating (TBC) material. The phase composition, microstructure and associated thermal properties of Gd2Hf2O7ceramics were characterized systematically. Results show that the thermal conductivity of Gd2Hf2O7ceramics is 1.40 Wm−1K−1at 1200 °C, ~25% lower than that of 8 wt% yttria partially stabilized zirconia (8YSZ). Gd2Hf2O7ceramics also present large thermal expansion coefficients, which decrease from 12.0 × 10−6K−1to 11.3 × 10−6K−1(300–1200 °C). Besides, the hot corrosion behaviors of Gd2Hf2O7ceramics exposed to V2O5and Na2SO4+ V2O5salts 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 Gd2Hf2O7ceramics subjected to molten V2O5and Na2SO4+ V2O5salts at different temperatures.