Long term protection of silicide coating at 1700 °C in air with HfO2 modification

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

Corrosion Science Pub Date : 2025-06-18 DOI:10.1016/j.corsci.2025.113122

Hongkang Ou, Yangfan Liu, Kaifei Fan, Yuyu Zhang, Lingxiang Guo, Bing Liu, Jia Sun, Qiangang Fu

引用次数: 0

Abstract

HfO₂-modified MoSi₂ coating was fabricated on Nb-alloy via supersonic atmosphere plasma spraying to protect against ultra-high temperature oxidation. The service life of the modified coating reached 200 h at 1700 °C, and the excellent oxidation resistance was attributed to the SiO₂+HfSiO₄ duplex scale stabilized by the Hf-dopant and the pinned phase of HfSiO₄. Continuous volatilization of SiO₂ triggered the outward diffusion and significant loss of Si element, dominating the degradation of the MoSi₂-based coating during oxidation. This work achieved long-term protection for Nb-alloy at 1700 °C, providing effective method and theoretical foundations for the design of the antioxidant coating.

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HfO2改性硅化物涂层在1700 °C空气中的长期保护

采用超声速气氛等离子喷涂技术在铌合金表面制备了hfo2修饰MoSi2涂层，以防止超高温氧化。改性后的涂层在1700 ℃下的使用寿命达到200 h，其优异的抗氧化性能归功于hf掺杂剂稳定的SiO2+HfSiO4双相垢和HfSiO4的钉住相。SiO2的持续挥发触发了Si元素的向外扩散和大量损失，主导了mosi2基涂层在氧化过程中的降解。本工作实现了铌合金在1700 ℃下的长期保护，为抗氧化涂层的设计提供了有效的方法和理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.

Long term protection of silicide coating at 1700 °C in air with HfO2 modification

Abstract

Long term protection of silicide coating at 1700 °C in air with HfO2 modification