溶胶-凝胶法制备核壳结构MoSi2@Al2O3颗粒及其形成机理

doi:10.11896/cldb.22010273

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Abstract Thermal stress and growth oxide layers induce initiation and propagation of the micro-cracks in the thermal barrier coatings (TBCs). MoSi₂ is selected as the next generation of healing agent because it improves the fluidity of SiO₂ and accelerates the healing of cracks inside at high temperatures. In this study, the sol-gel method was used to achieve MoSi₂@Al₂O₃ core-shell structure which can improve the pre-oxidation resistance of MoSi₂ in oxygen conditions. Aluminum isopropoxide has been selected as the aluminum source. The effects of temperature, pH value, and water-to-aluminum ratio on weight gain were investigated by orthogonal experiments to obtain the optimal parameters. The influence of post-treatment (including phase compositions and microstructures) was analyzed by XRD, SEM, EDS, and TEM methods. We concluded that the combination of 90 ℃, pH=4, and the water-to-aluminum ratio of 200 were optimal parameters. The weight gain of the shell layer can achieve the highest level of 22%. The pH value dominates the weight gain because it changes the Zeta potential of the MoSi₂ surface. After 3 hours of heat treatment in the vacuum furnace, the maximum thickness (around 200 nm) of α-Al₂O₃ shell layer is obtained at 1 200 ℃. To avoid the pre-oxidation of MoSi₂, the post-treatment should be operated in a vacuum atmosphere.

Key words： sol-gel core-shell structure heat treatment

Published: 25 August 2023 Online: 2023-08-14

CLC number:

TG15

Fund:National Natural Science Foundation of China (52104361).

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	Articles by authors
	YI Zhou
	CUI Shiyu
	LUO Junming
	CHU Yuxuan

Cite this article:

YI Zhou,CUI Shiyu,LUO Junming, et al. MoSi₂@Al₂O₃ Particles with Core-Shell Structure Prepared by Sol-Gel Method and Its Formation Mechanism[J]. Materials Reports, 2023, 37(16): 22010273-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22010273 OR http://www.mater-rep.com/EN/Y2023/V37/I16/22010273

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