Perovskite-Type Strontium Zirconate as a New Material for Thermal Barrier Coatings
Perovskite-Type Strontium Zirconate as a New Material for Thermal Barrier Coatings
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DOI：
10.1111/j.1551-2916.2008.02472.x
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发表时间：
2008-08
影响因子：
3.9
通讯作者：
Wen Ma;D. Mack;R. Vaßen;D. Stöver
中科院分区：
文献类型：
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作者：
Wen Ma;D. Mack;R. Vaßen;D. Stöver
研究了钙钛矿型SrZrO_3作为热障涂层(TBC)材料的替代材料。仅通过热容量测量发现了(orthorhombic↔pseudo-tetragonal↔tetragonal↔cubic)的三个相变，而在热膨胀测量中发现了从正交相到伪四方相的相变。在1200℃以下，SrZrO_3涂层的热膨胀系数(TEC)至少比YSZ涂层大4.5%。致密的SrZrO_3涂层的力学性能(杨氏模量、硬度和断裂韧性)比YSZ涂层的杨氏模量、硬度和断裂韧性低。在1200℃下，SrZrO_3涂层的“稳态”烧结率为1.04×10~(−)9 S−_1，不到1200℃时YSZ涂层的一半。用气体燃烧器进行的热循环试验表明，在1250℃的工作温度下，双层涂层的循环寿命是∼涂层的两倍以上，与YSZ涂层相当。然而，在&1300℃的工作温度下，SrZrO_3/YSZ DLC的循环寿命与优化后的YSZ涂层相当，这表明与YSZ相比，在更高的温度下，SrZrO_3可能是一种有前途的热障涂层材料。
Perovskite-type SrZrO3 was investigated as an alternative to yttria-stabilized zirconia (YSZ) material for thermal barrier coating (TBC) applications. Three phase transformations (orthorhombic↔pseudo-tetragonal↔tetragonal↔cubic) were found only by heat capacity measurement, whereas the phase transformation from orthorhombic to pseudo-tetragonal was found in thermal expansion measurements. The thermal expansion coefficients (TECs) of SrZrO3 coatings were at least 4.5% larger than YSZ coatings up to 1200°C. Mechanical properties (Young's modulus, hardness, and fracture toughness) of dense SrZrO3 showed lower Young's modulus, hardness, and comparable fracture toughness with respect to YSZ. The “steady-state” sintering rate of a SrZrO3 coating at 1200°C was 1.04 × 10−9 s−1, which was less than half that of YSZ coating at 1200°C. Plasma-sprayed coatings were produced and characterized. Thermal cycling with a gas burner showed that at operating temperatures ∼1250°C the cycling lifetime of SrZrO3/YSZ double-layer coating (DLC) was more than twice as long as SrZrO3 coating and comparable to YSZ coating. However, at operating temperatures >1300°C, the cycling lifetime of SrZrO3/YSZ DLC was comparable to the optimized YSZ coating, indicating SrZrO3 might be a promising material for TBC applications at higher temperatures compared with YSZ.