Liang Xu, Hongfei Gao, Xin He, Min Niu, Zhiwei Dai, Haotian Ni, Lei Su, Hongjie Wang
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引用次数: 0
Abstract
Ceramic thermal barrier coating (TBC) materials are used to protect the superalloys from the damage of harmful high-temperature airflow and improve the efficiency of jet and gas turbine engines. However, the long-term application of TBC materials and the robustness of these materials can be destroyed by aggressive calcium-magnesium-alumina-silicate (CMAS) melt during high-temperature service. Increasing the configuration entropy of material by doping multiple principal components has become a research hotspot in the design of corrosion-resistant thermal barrier coating material and has opened an infinite space of chemical composition, structure, and material properties. In this study, high-entropy (La0.2Sm0.2Er0.2Y0.2Yb0.2)2Ce2O7 was synthesized and its CMAS corrosion behavior was investigated by experimental investigation and first-principles calculation. The effects of the increase of configurational entropy and the subsequent potential effects on the CMAS corrosion behavior of Ce-based fluorite oxides have been sufficiently investigated. By compared with control samples, the high-entropy (La0.2Sm0.2Er0.2Y0.2Yb0.2)2Ce2O7 possesses the minimum infiltration depth of CMAS melts and the denser corrosion reaction layer, indicating the best corrosion resistance. The corrosion resistance mechanism of high-entropy (La0.2Sm0.2Er0.2Y0.2Yb0.2)2Ce2O7 was studied by first-principles calculation. The greater stability and resistance to segregation of CMAS melt in the CMAS/(La0.2Sm0.2Er0.2Y0.2Yb0.2)2Ce2O7 system, the poor adsorption capacity for CMAS melt which leads to a weak infiltration ability of CMAS melt; the weakest interfacial chemical reaction at the interface indicated by the smallest value of Griffith rupture work and the least species migration of high-entropy fluorite oxide can be responsible to the enhanced corrosion resistance. Our work reveals that increasing the configuration entropy can be an effective strategy for TBC material to enhance corrosion resistance.
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The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials.
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