Mechanical Properties Durability of Sc2O3-Y2O3 Co-Stabilized ZrO2 Thermal Barrier Materials for High Temperature Application

文献类型： 外文期刊

第一作者： Fan, Wei

作者： Fan, Wei;Liu, Yanfen;Wang, Yiqi;Bai, Yu;Wang, Yu;Liu, Qi

作者机构：

关键词： thermal barrier coatings; ScYSZ; phase stability; fracture toughness; heat treatment

期刊名称：COATINGS （ 影响因子：3.236； 五年影响因子：3.312 ）

ISSN：

年卷期： 2022 年 12 卷 2 期

页码：

收录情况： SCI

摘要： The poor phase stability of conventional 6-8 wt.% yttria-partially stabilized zirconia (YSZ) results in the formation of detrimental cracks in thermal barrier coatings (TBCs) as well as the decrease of fracture toughness, limiting its long-term application above 1200 degrees C. Here, we try to prove that a higher t '-phase stability is the prerequisite for the mechanical properties durability of ZrO2-based TBC materials. Compared with YSZ ceramic, 7.0 mol.% Sc2O3 and 0.5 mol.% Y2O3 co-stabilized ZrO2 (ScYSZ) shows a superior t ' phase stability at 1300 degrees C. In addition, the fracture toughness of ScYSZ is nearly stable after being annealed at 1300 degrees C for 0-40 h, while the value of YSZ gradually declines during the aging process. The stable fracture toughness of ScYSZ is closely related to its prominent t ' phase stability. The elastic modulus of ScYSZ is nearly unchanged and lower than that of YSZ. The excellent stability of the phase structure and mechanical properties makes ScYSZ a great potential material for next generation high-temperature TBCs.

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