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首页> 外文期刊>Materials Characterization >Interface failure behavior of yttria stabilized zirconia (YSZ), La2Zr2O7, Gd2Zr2O7, YSZ/La2Zr2O7 and YSZ/Gd2Zr2O7 thermal barrier coatings (TBCs) in thermal cyclic exposure
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Interface failure behavior of yttria stabilized zirconia (YSZ), La2Zr2O7, Gd2Zr2O7, YSZ/La2Zr2O7 and YSZ/Gd2Zr2O7 thermal barrier coatings (TBCs) in thermal cyclic exposure

机译：yttria稳定的氧化锆（YSZ），LA2ZR2O7，GD2ZR2O7，YSZ / LA2ZR2O7和YSZ / GD2ZR2O7热循环曝光中的热阻挡涂层（TBCS）的界面故障行为

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摘要

Gas turbine engines are exposed to severe oxidation and thermal shock under service conditions. Thermal barrier coatings (TBCs) are used to protect metallic components of gas turbines against such failures. Yttria stabilized zirconia (YSZ) has been the most common top coating material for TBC systems. However, rare earth zirconates such as La2Zr2O7 and Gd2Zr2O7 stand out as alternatives to YSZ top coating for TBCs. In this study, Inconel 718 substrates were coated with CoNiCrAIY using cold gas dynamic spray (CGDS) technique, which is a promising technology for bond coat spraying. All the ceramic top coats were produced by electron beam physical vapor deposition (EB-PVD) method that provides high strain tolerance under thermal loadings. To predict the lifetime of TBCs, the samples were subjected to furnace cycling tests at 1150 degrees C. After the tests, the microstructure of thermally grown oxide (TGO) layers, crack formations and chemical compatibility between the coating layers were investigated in detail. Results show that TBCs with double layered rare earth zirconate exhibit longer lifetime as compared to single layered TBCs.
机译：燃气轮机发动机在服务条件下暴露于严重的氧化和热冲击。热阻挡涂层（TBC）用于保护燃气轮机的金属组分免受这种故障。 yttria稳定的氧化锆（YSZ）是TBC系统最常见的顶部涂层材料。然而，La2ZR2O7和GD2ZR2O7等稀土锆酸盐作为TBCS的YSZ顶部涂层的替代品。在本研究中，使用冷气动力喷雾（CGDS）技术涂覆了718个衬底的Inconel 718底物，这是一种用于粘合涂层喷涂的有希望的技术。通过电子束物理气相沉积（EB-PVD）方法生产所有陶瓷顶部涂层，该方法在热载荷下提供高应变容差。为了预测TBC的寿命，将样品在1150℃下进行炉循环试验。在试验之后，详细研究了热生长氧化物（TGO）层，裂纹形成和涂层之间的化学相容性的微观结构。结果表明，与单层TBC相比，具有双层稀土锆锆的TBC表现出更长的寿命。

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