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烧绿石结构的稀土锆酸盐材料是新型热障涂层的潜在候选材料之一,能进一步提升涡轮发动机使用寿命和可靠性。通过大气等离子体喷涂技术制备了Sm2Zr2O7热障涂层,并对其显微结构和相组成进行表征。Sm2Zr2O7涂层表现出阴离子无序和阳离子有序的萤石相结构特征。经过高温热处理后,涂层结构的向有序方向转变。当热处理温度超过1200℃时,涂层转变为有序的烧绿石结构。热处理温度升高造成涂层中微裂纹的愈合,导致Sm2Zr2O7涂层典型的片层结构特征消失。
The pyrochlore-based rare earth zirconate material is one of the potential candidates for a new type of thermal barrier coating that further enhances turbine engine service life and reliability. The Sm2Zr2O7 thermal barrier coatings were prepared by atmospheric plasma spraying and their microstructures and phase compositions were characterized. The Sm2Zr2O7 coating shows the structural features of anomalous and cation ordered fluorite phase. After high temperature heat treatment, the coating structure changes in the orderly direction. When the heat treatment temperature exceeds 1200 ℃, the coating transformed into an ordered pyrochlore structure. The heat treatment temperature causes the microcracks in the coating to heal, resulting in the disappearance of the typical lamellar structure of the Sm2Zr2O7 coating.