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.
易周, 崔世宇, 罗军明, 初雨轩. 溶胶-凝胶法制备核壳结构MoSi2@Al2O3颗粒及其形成机理[J]. 材料导报, 2023, 37(16): 22010273-6.
YI Zhou, CUI Shiyu, LUO Junming, CHU Yuxuan. MoSi2@Al2O3 Particles with Core-Shell Structure Prepared by Sol-Gel Method and Its Formation Mechanism. Materials Reports, 2023, 37(16): 22010273-6.
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2023, Vol. 37 
