Ablation behavior of Zr0.375Hf0.375Nb0.125Ta0.125C carbide ceramics and their constituent ternary carbides: Role of A6B2O17 (A = Zr, Hf; B = Nb, Ta) oxides

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-05-28 DOI:10.1016/j.corsci.2025.113072

Fan Zhou, Zhilin Tian, Bin Li

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Abstract

Multicomponent carbides show great promise in next-generation thermal protection systems due to their high potential for ablation resistance. The in-situ formation of A₆B₂O₁₇ (A = Zr, Hf; B = Nb, Ta) oxides during ablation is a key factor contributing to this enhanced performance. However, the protective mechanisms remain unclear. This study investigated the role of different A₆B₂O₁₇ oxide scales formed on five multicomponent carbide ceramics (Zr_0.75Nb_0.25C, Zr_0.75Ta_0.25C, Hf_0.75Nb_0.25C, Hf_0.75Ta_0.25C, and Zr_0.375Hf_0.375Nb_0.125Ta_0.125C) during oxyacetylene ablation. All samples initially form A₆B₂O₁₇ scales and subsequently evolve into a porous, erosion-resistant skeletal structure composed mainly of A₈B₂O₂₁ and (Zr_1-x, Hf_x)O₂. The protective performance of these oxides depends on the A/B elements. Nb-containing oxide scales (Zr₆Nb₂O₁₇, Hf₆Nb₂O₁₇) show poor protection and form fragmented, porous layers due to the high volatility of Nb oxide. In contrast, Ta-containing scales (Zr₆Ta₂O₁₇, Hf₆Ta₂O₁₇, and (Zr, Hf)₆(Nb, Ta)₂O₁₇) develop more continuous protective structures. Notably, the (Zr, Hf)₆(Nb, Ta)₂O₁₇ scale formed on Zr_0.375Hf_0.375Nb_0.125Ta_0.125C shows exceptional ablation resistance and achieves the thinnest thickness. This performance is attributed to the formation of bilayer structure: an outer porous (Zr_1-x, Hf_x)O₂/A_nB₂O_2n+5 skeleton and an inner dense A_nB₂O_2n+5/(Nb_1-y, Ta_y)₂O₅ layer. The (Nb_1-y, Ta_y)₂O₅ melt retained in the inner layer exhibits good flowability and low oxygen diffusivity, effectively blocking oxygen diffusion. These findings provide valuable insights for the design of advanced ablation-resistant materials.

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Zr0.375Hf0.375Nb0.125Ta0.125C碳化物陶瓷及其三元碳化物的烧蚀行为：A6B2O17 （A = Zr, Hf）的作用B = Nb, Ta)氧化物

多组分碳化物由于其高抗烧蚀潜力，在下一代热保护系统中显示出巨大的前景。原位生成A6B2O17 (A = Zr, Hf；烧蚀过程中的B = Nb, Ta)氧化物是提高性能的关键因素。然而，保护机制仍不清楚。研究了氧乙炔烧蚀在Zr0.75Nb0.25C、Zr0.75Ta0.25C、Hf0.75Nb0.25C、Hf0.75Ta0.25C、Zr0.375Hf0.375Nb0.125Ta0.125C五种多组分碳化物陶瓷上形成的不同A6B2O17氧化膜的作用。所有样品最初都形成A6B2O17鳞片，随后演变成主要由A8B2O21和（Zr1-x, Hfx）O2组成的多孔、耐侵蚀的骨架结构。这些氧化物的防护性能取决于A/B元素。含铌氧化物（Zr6Nb2O17, Hf6Nb2O17）由于氧化铌的高挥发性，保护效果较差，形成破碎的多孔层。相比之下，含Ta的鳞片（Zr6Ta2O17、Hf6Ta2O17和（Zr, Hf）6(Nb, Ta)2O17）形成了更连续的保护结构。值得注意的是，在Zr0.375Hf0.375Nb0.125Ta0.125C上形成的（Zr, Hf）6(Nb, Ta)2O17鳞片表现出优异的抗烧蚀性和最薄的厚度。这种性能归因于双层结构的形成：外层是多孔的（Zr1-x, Hfx）O2/AnB2O2n+5骨架，内部是致密的AnB2O2n+5/(Nb1-y, Tay)2O5层。保留在内层的（Nb1-y, Tay）2O5熔体具有良好的流动性和低氧扩散率，有效地阻断了氧的扩散。这些发现为设计先进的抗烧蚀材料提供了有价值的见解。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.