Novel high-entropy ultra-high temperature ceramics with enhanced ablation resistance

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-07-22 DOI:10.1007/s12598-024-02904-5

Pan Zhang, Xiong-Jun Liu, Guang-Yu He, Fu-Kuo Chiang, Hui Wang, Yuan Wu, Sui-He Jiang, Xiao-Bin Zhang, Zhao-Ping Lu

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引用次数: 0

Abstract

Ultra-high temperature ceramics (UHTCs) offer great potential for applications in extreme service environments, such as hypersonic vehicles, rockets and re-entry spacecraft. However, the severe ablation caused by high-speed heat flow scouring and high-temperature oxidation limits the engineering application of UHTCs. In this work, we report a novel high-entropy UHTC (Ti_0.2Zr_0.2V_0.2Nb_0.2Cr_0.2)(C_0.5N_0.5), which exhibits superior ablation resistance and light weight compared with traditional UHTCs. Specifically, at a temperature of 2650 K, the mass ablation rate of the material was measured as 1.025 × 10⁻² g·s⁻¹, and the density was calculated to be 6.7 g·cm⁻³. The impressive ablation resistance of (Ti_0.2Zr_0.2V_0.2Nb_0.2Cr_0.2)(C_0.5N_0.5) is attributed to the incorporation of a self-healing mechanism, which is associated with the in-situ formation of a medium-entropy oxide (TiVCr)O₂ during the ablation process. The medium-entropy oxide can seal pores and cracks to retard oxygen diffusion and prevent the material from fragmentation, thereby resulting in outstanding ablation resistance.

Graphical abstract

Abstract Image

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耐烧蚀性更强的新型高熵超高温陶瓷

超高温陶瓷（UHTC）在高超音速飞行器、火箭和重返大气层航天器等极端服役环境中的应用潜力巨大。然而，高速热流冲刷和高温氧化造成的严重烧蚀限制了超高温陶瓷的工程应用。在这项工作中，我们报告了一种新型高熵超高强钛金属（Ti0.2Zr0.2V0.2Nb0.2Cr0.2）(C0.5N0.5)，与传统超高强钛金属相比，它具有优异的抗烧蚀性能和轻质特性。具体来说，在 2650 K 的温度下，测得该材料的质量烧蚀率为 1.025 × 10-2 g-s-1，计算得出的密度为 6.7 g-cm-3。(Ti0.2Zr0.2V0.2Nb0.2Cr0.2)(C0.5N0.5)令人印象深刻的耐烧蚀性归因于其中的自修复机制，这与烧蚀过程中在原位形成的中熵氧化物 (TiVCr)O2 有关。中熵氧化物可以封闭孔隙和裂缝，延缓氧气扩散，防止材料破碎，从而使材料具有出色的耐烧蚀性。

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.