用于隔热涂层的 Hf6Ta2O17 和 Al2O3 在高温下的热化学相容性

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2024-11-25 DOI:10.1016/j.jeurceramsoc.2024.117109

Fan Zhou, Zhilin Tian, Bin Li

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引用次数: 0

摘要

与钇稳定氧化锆（YSZ）相比，Hf6Ta2O17 具有更好的高温稳定性和抗钙镁铝硅酸盐（CMAS）性能，是一种潜在的高温隔热涂层（TBC）材料。然而，Hf6Ta2O17 与热生长氧化物（主要是 α-Al2O3）之间的高温相容性尚未明确。通过在 1300-1600 °C 下退火 Hf6Ta2O17-Al2O3 复合粉末和 Al2O3/Hf6Ta2O17 扩散耦合物，研究了 Hf6Ta2O17 和 Al2O3 之间的热化学相容性。1300 °C 时，Hf6Ta2O17 和 Al2O3 不发生反应。在 1400 °C 以上，Hf6Ta2O17 与 Al2O3 反应生成 AlHf3TaO10，在 Al2O3/Hf6Ta2O17 界面形成中间相层。随着退火时间的延长，层厚度逐渐增加，铝扩散导致 Al2O3/AlHf3TaO10 界面出现微空洞。AlHf3TaO10 的热膨胀系数远低于 Hf6Ta2O17 和 Al2O3，因此会产生较高的界面热应力。Hf6Ta2O17 和 Al2O3 在 1400 °C 以上的热化学不相容性可能会加剧基于 Hf6Ta2O17 的 TBC 的失效。

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Thermochemical compatibility between Hf6Ta2O17 and Al2O3 at high temperatures for thermal barrier coatings

Hf₆Ta₂O₁₇ is a potential high-temperature thermal barrier coating (TBC) material with better high-temperature stability and calcium magnesium aluminosilicate (CMAS) resistance than yttria-stabilized zirconia (YSZ). However, the high-temperature compatibility between Hf₆Ta₂O₁₇ and the thermally grown oxide (mainly α-Al₂O₃) has not been clarified. The thermochemical compatibility between Hf₆Ta₂O₁₇ and Al₂O₃ was investigated by annealing Hf₆Ta₂O₁₇-Al₂O₃ composite powders and Al₂O₃/Hf₆Ta₂O₁₇ diffusion couples at 1300–1600 °C. At 1300 °C, Hf₆Ta₂O₁₇ and Al₂O₃ do not react. Above 1400 °C, Hf₆Ta₂O₁₇ reacts with Al₂O₃ to form AlHf₃TaO₁₀, forming an intermediate phase layer at the Al₂O₃/Hf₆Ta₂O₁₇ interface. The layer thickness gradually increases as the annealing time rises, and Al diffusion causes micro-voids at the Al₂O₃/AlHf₃TaO₁₀ interface. The thermal expansion coefficient of AlHf₃TaO₁₀ is much lower than that of Hf₆Ta₂O₁₇ and Al₂O₃, resulting in high interfacial thermal stresses. The thermochemical incompatibility between Hf₆Ta₂O₁₇ and Al₂O₃ above 1400 °C may exacerbate the failure of Hf₆Ta₂O₁₇-based TBCs.

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.