Functionally Graded Oxide Scale on (Hf,Zr,Ti)B2 Coating with Exceptional Ablation Resistance Induced by Unique Ti Dissolving

IF 14.3 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Advanced Science Pub Date : 2025-01-15 DOI:10.1002/advs.202411292
Junshuai Lv, Wei Li, Yanqin Fu, Menglin Zhang, Lingxiang Guo, Fanyu Lu, Jiachen Li, Tao Li, Yulei Zhang, Hejun Li
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Abstract

Multicomponent Ti-containing ultra-high temperature ceramics (UHTCs) have emerged as more promising ablation-resistant materials than typical UHTCs for applications above 2000 °C. However, the underlying mechanism of Ti improving the ablation performance is still obscure. Here, (Hf,Zr,Ti)B2 coatings are fabricated by supersonic atmospheric plasma spraying, and the effects of Ti content on the ablation performance under an oxyacetylene flame are investigated. The (Hf0.45Zr0.45Ti0.10)B2 coating shows superior ablation resistance and cycling reliability at ≈2200°C. A functionally graded oxide scale comprising an outer dense layer and an underlying fine granular layer formed. The former is a better oxygen barrier owing to fewer cracks and the latter has high strain tolerance due to finer grain size. The uniform dissolving of ≈4 mol% Ti in the inner layer results in grain refinement via sluggish diffusion and thus stress release. For the outer layer, Ti segregation at the nanoscale leads to a metastable cubic (Hf,Zr,Ti)O2 and local severe lattice distortion, inhibiting the propagation of cracks. Ti ions’ unique dissolving in the oxide scale enables a strong oxygen diffusion barrier with high strain tolerance, which is responsible for superior performance. This study provides new insights into the ablation behavior of Ti-containing multicomponent UHTCs.

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(Hf,Zr,Ti)B2涂层上的功能梯度氧化垢具有独特的Ti溶解诱导的优异的抗烧蚀性。
多组分含钛超高温陶瓷(UHTCs)已成为比典型的超高温陶瓷更有前途的耐烧蚀材料,适用于2000°C以上的应用。然而,Ti改善烧蚀性能的潜在机制尚不清楚。采用超声速大气等离子喷涂法制备了(Hf,Zr,Ti)B2涂层,研究了Ti含量对氧乙炔火焰烧蚀性能的影响。(Hf0.45Zr0.45Ti0.10)B2涂层在≈2200℃下表现出优异的耐烧蚀性和循环可靠性。一种功能分级的氧化垢,包括形成的外层致密层和下面的细颗粒层。前者由于裂纹较少而具有较好的阻氧性,后者由于晶粒尺寸更细而具有较高的应变容限。≈4 mol% Ti在内层的均匀溶解导致晶粒通过缓慢扩散而细化,从而释放应力。对于外层,纳米尺度的Ti偏析导致亚稳立方(Hf,Zr,Ti)O2和局部严重的晶格畸变,抑制了裂纹的扩展。钛离子在氧化垢中的独特溶解性使其具有强大的氧扩散屏障,具有高应变容限,从而具有优异的性能。本研究对含钛多组分超高温碳化物的烧蚀行为提供了新的认识。
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来源期刊
Advanced Science
Advanced Science CHEMISTRY, MULTIDISCIPLINARYNANOSCIENCE &-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
18.90
自引率
2.60%
发文量
1602
审稿时长
1.9 months
期刊介绍: Advanced Science is a prestigious open access journal that focuses on interdisciplinary research in materials science, physics, chemistry, medical and life sciences, and engineering. The journal aims to promote cutting-edge research by employing a rigorous and impartial review process. It is committed to presenting research articles with the highest quality production standards, ensuring maximum accessibility of top scientific findings. With its vibrant and innovative publication platform, Advanced Science seeks to revolutionize the dissemination and organization of scientific knowledge.
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