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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摘要为推动乏燃料回收利用并降低其危害,本文采用料浆烧结工艺在纯Ta表面制备MoSi₂/Y₂O₃复合涂层,以MoSi₂-Ta涂层作为中间层,纯Y₂O₃作为顶层保护层。通过X射线衍射仪、扫描电子显微镜和能谱仪等设备表征涂层在热震实验前后的微观组织演变,并结合有限元模拟分析其抗热震性能。结果表明：MoSi₂/Y₂O₃涂层由不规则的不完全熔融颗粒堆叠构成;在烧结与热震过程中生成Mo₅Si₃、MoO₃、SiO₂、TaSi₂、Y₂SiO₅等新相。涂层体系中Si元素呈现显著扩散特征,且热震过程伴随着氧含量的增加。经热震后,基体-涂层界面处出现分层失效,MoSi₂/Y₂O₃双层涂层发生剥落,并以剥落区为裂纹源形成纵向扩展裂纹。涂层体系中分层、剥落等缺陷的形成机制包括：热膨胀系数失配导致的热应力累积;新相生成引发的生长应力累积;易挥发相逸散造成氧化膜破裂降低涂层强度。

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	袁松泉
	袁铁锤
	蔺仕琦
	王飞

关键词 ：氧化钇涂层, 料浆烧结法, 抗热震性能, 二硅化钼涂层, 钽

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

收稿日期: 2025-03-01 出版日期: 2025-10-13

ZTFLH:

TG113.23+3

基金资助:中核集团2023年青年英才项目

通讯作者: 袁铁锤,教授,博士。电话：13327312560;E-mail: tiechuiyuan@csu.edu.cn

引用本文:

袁松泉, 袁铁锤, 蔺仕琦, 王飞. 金属钽表面制备MoSi₂/Y₂O₃涂层及其抗热震性能研究[J]. 粉末冶金材料科学与工程, 2025, 30(4): 301-309.
YUAN Songquan, YUAN Tiechui, LIN Shiqi, WANG Fei. Preparation of MoSi₂/Y₂O₃ coating on tantalum and study on its thermal shock resistance. Materials Science and Engineering of Powder Metallurgy, 2025, 30(4): 301-309.

链接本文:

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

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