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

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

doi:10.1016/j.corsci.2025.113122

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

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

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	113122
Journal	Corrosion Science
Volume	255
DOIs	https://doi.org/10.1016/j.corsci.2025.113122
State	Published - Oct 2025

Keywords

Interdiffusion
MoSi coating
Niobium alloy
Ultra-high temperature oxidation

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10.1016/j.corsci.2025.113122

Cite this

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title = "Long term protection of silicide coating at 1700 °C in air with HfO2 modification",

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.",

keywords = "Interdiffusion, MoSi coating, Niobium alloy, Ultra-high temperature oxidation",

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

note = "Publisher Copyright: {\textcopyright} 2025 Elsevier Ltd",

year = "2025",

month = oct,

doi = "10.1016/j.corsci.2025.113122",

language = "英语",

volume = "255",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier Ltd",

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TY - JOUR

T1 - Long term protection of silicide coating at 1700 °C in air with HfO2 modification

AU - Ou, Hongkang

AU - Liu, Yangfan

AU - Fan, Kaifei

AU - Zhang, Yuyu

AU - Guo, Lingxiang

AU - Liu, Bing

AU - Sun, Jia

AU - Fu, Qiangang

PY - 2025/10

Y1 - 2025/10

N2 - 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.

AB - 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.

KW - Interdiffusion

KW - MoSi coating

KW - Niobium alloy

KW - Ultra-high temperature oxidation

UR - http://www.scopus.com/inward/record.url?scp=105008670890&partnerID=8YFLogxK

U2 - 10.1016/j.corsci.2025.113122

DO - 10.1016/j.corsci.2025.113122

M3 - 文章

AN - SCOPUS:105008670890

SN - 0010-938X

VL - 255

JO - Corrosion Science

JF - Corrosion Science

M1 - 113122

ER -

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

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Keywords

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

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