Nb、W合金化对电弧熔覆MoSi<sub>2</sub>涂层高温抗氧化性的影响

doi:10.11896/cldb.24040229

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Abstract MoSi₂ coating is considered as one of the ideal high-temperature protective materials at present because of its good high-temperature oxidation resistance, thermal corrosion resistance, etc. However, the mismatch of thermal expansion coefficient between the coating and the substrate and interfacial interdiffusion problems seriously affect the antioxidant performance of MoSi₂ coating. In this work, Nb- and W-alloyed MoSi₂ coatings with different ratios were prepared on Mo substrate by arc cladding technology, and the effects of Nb and W elements on the organization, morphology, and oxidation resistance of MoSi₂ coatings were investigated under high-temperature oxidizing environment. The results show that the C11_b/C40-type (Mo, Nb)Si₂ formed by the addition of 2%Nb increases the defects in the coating and the oxide layer, and the addition of 4%W improves the densities of the coating and the oxide layer, while the addition of 10%W adversely affects the densification of the oxide layer. According to the oxidation kinetic curves, the MoSi₂ coatings with 4%W and with 2% Nb+4%W showed a trend of oxidative weight gain, and a denser oxide film was formed during the oxidation process. By correlating the oxidation kinetic curves to derive the parabolic velocity constants, it becomes evident that the oxidation rate of MoSi₂ accelerates with increasing Nb and W content. The impact of adding a single element of Nb on the thickness of the MoSi₂ oxide layer is minimal, whereas the synergistic alloying of Nb and W leads to a notable increase in oxide layer thickness. Oxidative activation energy calculations indicate that the MoSi₂ coating with 2%Nb+4%W has the highest oxidation activation energy, which is about 2.4 times that of pure MoSi₂, and has the best high-temperature antioxidant performance.

Key words： MoSi₂ coating arc cladding alloying high temperature oxidation resistance

Published: 25 May 2025 Online: 2025-05-13

CLC number:

TG148

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	Articles by authors
	WANG Yurui
	SUN Hongfei
	SUN Shunping
	WANG Hongjin
	ZHAO Fengling
	ZHANG Yang
	LI Xiaoping

Cite this article:

WANG Yurui,SUN Hongfei,SUN Shunping, et al. Effect of Nb and W Alloying by Arc Cladding on the High-temperature Oxidation Resistance of MoSi₂ Coatings[J]. Materials Reports, 2025, 39(10): 24040229-7.

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https://www.mater-rep.com/EN/10.11896/cldb.24040229 OR https://www.mater-rep.com/EN/Y2025/V39/I10/24040229

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