一种区域定制的(Hf, Ta)B2-SiC超高热防护涂层:微观结构的设计与演变

IF 7.4 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Jiaqi Hou, Jiaping Zhang, Ruicong Chen, Chenglong Tan, Binghong Li, Xianghui Hou, Qiangang Fu
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引用次数: 0

摘要

在先进飞机的使用环境中,碳/碳复合材料热结构部件不同区域的热载荷和气动载荷表现出显著的差异,由于热膨胀和应力积累不匹配,往往导致保护涂层开裂或失效。为了解决这一问题,本文提出了一种创新的区域定制保护涂层策略。设计并制备了一种区域定制的(Hf, Ta)B2-SiC涂层,其中心区域富集(Hf, Ta)B2,边缘区域富集SiC,并在氧乙炔火焰下进行了评价。烧蚀后,由于不同区域间的热应力失配得到缓解,与均匀的(Hf, Ta)B2-SiC涂层相比,经过30 s烧蚀后,区域定制涂层的厚度和质量损失率分别降低了104 %和103 %。抗烧蚀性表现在hf基氧化物的热稳定性、烧结致密化和晶界钉住等方面,减少了氧的扩散,提高了氧化层的稳定性。本研究为热结构件涂层的设计和制备提供了新的思路和启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An area-tailored (Hf, Ta)B2-SiC coating for ultra-high thermal protection: Design and evolution of microstructure
In the service environments of advanced aircrafts, thermal and aerodynamic loads on different areas of carbon/carbon composites thermal-structural components exhibit significant variation, often leading to cracking or failure of the protective coatings due to mismatched thermal expansion and stress accumulation. To address the problem, an innovative area-tailored protective coating strategy is proposed in this paper. An area-tailored (Hf, Ta)B2-SiC coating was designed and prepared, featuring enriched (Hf, Ta)B2 in the central area and SiC in the edge area, and was evaluated under oxyacetylene flame. After ablation, the area-tailored coating showed good cyclic ablation resistance due to the alleviated thermal stress mismatch across different coating regions, whose thickness and mass loss rates decreased by 104 % and 103 % after ablation for 30 s, respectively, compared to the uniform (Hf, Ta)B2-SiC coating. The ablation resistance is manifested in the thermostability of Hf-based oxides, sintering densification, and grain boundary pinning, which reduce oxygen diffusion and improve the stability of the oxide layer. This work provides a new strategy and inspiration for the design and preparation of coatings for thermal structural components.
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来源期刊
Corrosion Science
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.
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