Oxidation and ablation resistance of (TiZrHf)C medium-entropy ceramic coating on C/C composite constructed in-situ at low temperature down to 900°C

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

Journal of The European Ceramic Society Pub Date : 2024-10-09 DOI:10.1016/j.jeurceramsoc.2024.116976

Wenjian Guo , Jinyu Gong , Li’an Zhu , Yicong Ye , Shifeng Zhang , Shuxin Bai

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引用次数: 0

Abstract

The low-cost construction of ultra-high temperature high/medium-entropy ceramic coatings is pivotal for advancing their engineering applications. The study successfully prepared (TiZrHf)C medium-entropy ceramic coatings on C/C composite surfaces using an in-situ molten salt disproportionation reaction at temperatures as low as 900°C. The (TiZrHf)C coatings, approximately 20 μm thick, showed uniform distribution of Ti, Zr, and Hf, typical of medium-entropy ceramics. The process entails Hf reducing Zr⁴⁺ and Ti⁴⁺ to divalent states, which then disproportionate and react with carbon to form the coatings. High-temperature oxidation tests revealed larger oxide grain sizes and dense boundaries in coatings with higher Ti content, indicating superior oxidation resistance. Additionally, ablation tests demonstrated that a suitable amount of liquid-phase TiO₂ formed on the composite surface improves ablation resistance by stabilizing the oxide layer. This cost-effective, highly designable method promotes medium/high-entropy ultra-high temperature ceramics' engineering application.

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C/C 复合材料上的 (TiZrHf)C 中等熵陶瓷涂层在低温至 900°C 原位构建过程中的抗氧化性和抗烧蚀性

低成本制造超高温高/中熵陶瓷涂层对于推动其工程应用至关重要。该研究利用原位熔盐歧化反应，在低至 900°C 的温度下成功地在 C/C 复合材料表面制备了 (TiZrHf)C 中熵陶瓷涂层。(TiZrHf)C 涂层厚约 20 μm，显示出 Ti、Zr 和 Hf 的均匀分布，是典型的中熵陶瓷。这一过程需要 Hf 将 Zr⁴⁺ 和 Ti⁴⁺ 还原成二价态，然后二价态发生歧化并与碳反应形成涂层。高温氧化测试表明，钛含量较高的涂层中氧化物晶粒尺寸较大，边界致密，这表明涂层具有优异的抗氧化性。此外，烧蚀测试表明，在复合材料表面形成的适量液相 TiO₂ 能稳定氧化层，从而提高耐烧蚀性。这种成本效益高、可设计性强的方法促进了中/高熵超高温陶瓷的工程应用。

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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.