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研究了三元层状化合物Ti3SiC2、Ti3AlC2在熔融LiF-NaF-KF盐中的腐蚀行为,探索其腐蚀机理及抗腐蚀性能。研究发现,这两种MAX相材料在熔融FLiNaK盐中的腐蚀表现为A元素的溶解,进而形成腐蚀产物TiCx。数据表明,Ti3SiC2表现出比Ti3AlC2更好的抗腐蚀性,Ti3AlC2中的A元素Al几乎全部溶解,而Ti3SiC2中A元素Si溶解只发生在表层及浅表层。从理论分析和微结构表征方面对实验现象进行了解释,并且针对由六方Ti3AlC2转变为立方TiCx提出了相应的机理。
The corrosion behavior of ternary layered compounds Ti3SiC2 and Ti3AlC2 in molten LiF-NaF-KF salts was studied, and their corrosion mechanism and corrosion resistance were explored. It is found that the corrosion of these two MAX phase materials in molten FLiNaK salt is characterized by the dissolution of element A and the formation of the corrosion product TiCx. The data show that Ti3SiC2 shows better corrosion resistance than Ti3AlC2, Al is almost completely dissolved in Ti3AlC2, whereas Ti in Si3SiC2 dissolves only in superficial and superficial layers. The experimental phenomena are explained from theoretical analysis and microstructure characterization, and the corresponding mechanism is proposed for the transformation from hexagonal Ti3AlC2 to cubic TiCx.