金属钽表面制备MoSi2/Y2O3涂层及其抗热震性能研究

doi:10.19976/j.cnki.43-1448/TF.2025021

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Abstract To promote the spent fuel recycling, mitigate its hazards, MoSi₂/Y₂O₃ composite coating was fabricated on pure Ta surface by slurry sintering in this study, MoSi₂-Ta coating as the interlayer and Y₂O₃ as the top layer. The microstructural evolution of the coatings before and after thermal shock testing was characterized using techniques such as X-ray diffractometer, scanning electron microscope, and energy spectrometer, and the thermal shock resistance was investigated in combination with finite element simulations. The results demonstrate that the MoSi₂/Y₂O₃ coating consists of irregular, incompletely melted particles stacked together; new phases including Mo₅Si₃, MoO₃, SiO₂, TaSi₂, and Y₂SiO₅ are generated during sintering and thermal shock processes. Significant diffusion characteristics of Si element are observed in the coating system, accompanied by oxygen content increase during thermal shock. After thermal shock, interfacial delamination failure occurres at the substrate-coating interface, with spalling of MoSi₂/Y₂O₃ bilayer coating that serve as crack initiation sources for longitudinal propagation cracks. The formation mechanisms of defects such as delamination and spalling in the coating system including thermal stress accumulation induced by thermal expansion coefficient mismatch; growth stress accumulation caused by new phase formation; strength reduction due to oxide film rupture from volatile phase evaporation.

Key words： yttrium oxide coating slurry sintering method thermal shock resistance molybdenum disilicide coating tantalum

Received: 01 March 2025 Published: 13 October 2025

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TG113.23+3

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	YUAN Songquan
	YUAN Tiechui
	LIN Shiqi
	WANG Fei

Cite this article:

YUAN Songquan,YUAN Tiechui,LIN Shiqi, et al. Preparation of MoSi₂/Y₂O₃ coating on tantalum and study on its thermal shock resistance[J]. Materials Science and Engineering of Powder Metallurgy, 2025, 30(4): 301-309.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2025021 OR http://pmbjb.csu.edu.cn/EN/Y2025/V30/I4/301

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