Thermal erosion characteristics of vacuum hot-pressed NbC-modified ZrC ultra-high temperature ceramics ranging from 1500 to 2500 °C

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-09-18 DOI:10.1016/j.jeurceramsoc.2025.117835

Ruixiang He, Kezhi Li, Mengyuan Chang

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Abstract

Static oxidation and oxyacetylene ablation tests were conducted on vacuum hot-pressed NbC-modified ZrC (Zr_1-xNb_xC) ultra-high temperature ceramics. For revealing the oxidation mechanism, the phase composition of heat-treated ZrO₂Nb₂O₅ ceramics in Ar was identified. The results demonstrated that the stable phases of the ZrO₂-50 mol% NbO_2.5 ceramic heat-treated at 17001900 °C were Nb₂Zr₆O₁₇ and NbO₂. The oxidation resistant temperature limit (T_l) for Zr_1-xNb_xC was 1650 ˂ T_l ˂ 1700 °C. At 1650 °C for 30 h, Zr_0.7Nb_0.3C formed a dense oxide film comprising bulky ZrO₂ bonded by lathy Nb₂Zr₆O₁₇, exhibiting optimal oxidation resistance. Zr_0.9Nb_0.1C developed a dense “free-standing” single-phase ZrO₂ film at 4.2 MW/m² for 40 s × 6, achieving a modification effect on the ablation morphology of ZrC nearing 100%. Furthermore, the thermostability mechanism of ZrO₂ to Nb₂O₅ and the formation mechanism of the “free-standing” structure were analysed.

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1500 ~ 2500℃真空热压nbc改性ZrC超高温陶瓷的热侵蚀特性

对真空热压nbc改性ZrC （Zr1-xNbxC）超高温陶瓷进行了静态氧化和氧乙炔烧蚀试验。为了揭示氧化机理，研究了热处理ZrO2Nb2O5陶瓷在Ar中的相组成。结果表明，在1700 ~ 1900℃热处理的ZrO2-50 mol% NbO2.5陶瓷的稳定相为Nb2Zr6O17和NbO2。Zr1-xNbxC的抗氧化极限温度（Tl）为1650小于Tl: 1700°C。在1650℃，30 h下，Zr0.7Nb0.3C形成了由Nb2Zr6O17键合而成的致密氧化膜，具有良好的抗氧化性能。Zr0.9Nb0.1C在4.2 MW/m2、40 s × 6中形成致密的“独立”单相ZrO2膜，对ZrC烧蚀形貌的改性效果接近100%。分析了ZrO2对Nb2O5的热稳定性机理和“独立”结构的形成机理。

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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.