EB-PVD Y2O3 and CeO2/Y2O3 Stabilized Zirconia Thermal Barrier Coatings- Crystal Habit and Phase Composition.
EB-PVD Y2O3 and CeO2/Y2O3 Stabilized Zirconia Thermal Barrier Coatings- Crystal Habit and Phase Composition.
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DOI：
10.1016/0257-8972(95)02727-0
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发表时间：
1996-08
影响因子：
5.4
通讯作者：
U. Schulz;K. Fritscher;M. Peters
中科院分区：
文献类型：
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作者：
U. Schulz;K. Fritscher;M. Peters
分别使用含有 6.5 和 20 wt.% Y2O3 稳定氧化物和 25 2.5 wt.% CeO2Y2O3 的 ZrO2 基锭源，通过反应性高速率 EB-PVD 在旋转圆柱形电子束物理气相沉积 (EB-PVD) NiCoCrAlY 涂层 IN 100 基材上沉积热障涂层 (TBC)。通过扫描电子显微镜、X射线荧光和X射线衍射对TBC进行了研究。对于 6.5 wt.% Y2O3ZrO2，TBC 内的相为 t' 四方相；对于 20 wt.% Y2O3ZrO2 TBC，TBC 内的相为立方相。在二氧化铈稳定的 TBC 中发现的相为 t' 相、立方相和单斜相，具体取决于层内的成分波动。成分变化是由于二氧化铈稳定锭源中各种氧化物各自的蒸气压存在巨大差异，这在单源 EB-PVD 加工中变得有效。 TBC 中的表观晶体习性与工艺参数、物相和化学性质以及结构生长模型相关。
ZrO2-based ingot sources with stabilizing oxides of 6.5 and 20 wt.% Y2O3and 25 2.5 wt.% CeO2Y2O3respectively were used to deposit thermal barrier coatings (TBCs) on rotating cylindrical electron beam physical vapour deposition (EB-PVD) NiCoCrAlY-coated IN 100 substrates by reactive high rate EB-PVD. The TBCs were investigated by scanning electron microscopy, X-ray fluorescence and X-ray diffraction. The phases within the TBCs were t′ tetragonal for 6.5 wt.% Y2O3ZrO2and cubic for 20 wt.% Y2O3ZrO2TBCs. The phases found in ceria-stabilized TBCs were t′, cubic and monoclinic depending on the compositional fluctuations within the layers. Compositional variations were due to wide differences in the respective vapour pressures of the various oxides in ceria-stabilized ingot sources which become effective in single-source EB-PVD processing. The apparent crystal habits in the TBCs were correlated with process parameters, phases and chemistry and with regard to structural growth models.