{"title":"An area-tailored (Hf, Ta)B2-SiC coating for ultra-high thermal protection: Design and evolution of microstructure","authors":"Jiaqi Hou, Jiaping Zhang, Ruicong Chen, Chenglong Tan, Binghong Li, Xianghui Hou, Qiangang Fu","doi":"10.1016/j.corsci.2025.113353","DOIUrl":null,"url":null,"abstract":"<div><div>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)B<sub>2</sub>-SiC coating was designed and prepared, featuring enriched (Hf, Ta)B<sub>2</sub> 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)B<sub>2</sub>-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.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"257 ","pages":"Article 113353"},"PeriodicalIF":7.4000,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Corrosion Science","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0010938X2500681X","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
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.
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.