Environmental stability of the YSZ layer and the YSZ/TGO interface of an in-service EB-PVD coated high-pressure turbine blade
Environmental stability of the YSZ layer and the YSZ/TGO interface of an in-service EB-PVD coated high-pressure turbine blade
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在役 EB-PVD 涂层高压涡轮叶片的 YSZ 层和 YSZ/TGO 界面的环境稳定性
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发表时间：
2009
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通讯作者：
W. Braue
中科院分区：
文献类型：
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作者：
W. Braue
在役EB-PVD涂层第一级高压涡轮机（HPT）叶片在交互式CaSO 4渗透/CMAS沉积工艺后的热腐蚀产生了氧化钇稳定氧化锆（YSZ）顶层涂层和TGO层的反应界面，通过分析扫描和透射电子显微镜（TEM）进行了研究。尽管涂层完全渗透CaSO 4，但翼型的宏观损伤仅限于靠近后缘的压力面。由于CaSO 4/CMAS沉积物的本体组成表现出高的石灰-二氧化硅比，CaSO 4/CMAS/YSZ界面通常涉及富Ca-Zr层，随后是包围圆形YSZ柱尖端的细粒Ca-FSZ颗粒。没有观察到YSZ柱壁和CaSO 4孔填料之间的界面反应。这种独特的CaSO 4/CMAS微观结构的形成可能的条款进行评估。本文根据CaO-Y_2 O_3-ZrO_2和CaO-ZrO_2-SiO_2体系中的相相容性讨论了氧化锆在热腐蚀中的失稳现象，并与以前对天然和合成热腐蚀沉积物的研究结果进行了比较。
Hot corrosion of an in-service EB-PVD coated 1st stage high-pressure turbine (HPT) blade following an interactive CaSO4 infiltration/CMAS deposition process has produced reactive interfaces with the yttria stabilized zirconia (YSZ) top coat and the TGO layer which were investigated by analytical scanning and transmission electron microscopy (TEM). Despite complete CaSO4 infiltration of the coating macroscopic damage of the airfoil was confined to the pressure surface close to the trailing edge. Since the bulk composition of the CaSO4/CMAS deposits exhibited a high lime-to-silica ratio CaSO4/CMAS/YSZ interfaces typically involved a Ca–Zr-rich layer followed by fine-grained Ca-FSZ particles enveloping rounded YSZ column tips. No interfacial reaction was observed between the YSZ column walls and the CaSO4 pore fillings. Possible terms for the formation of this unique CaSO4/CMAS microstructure are evaluated. Zirconia destabilization upon hot corrosion is discussed in the light of phase compatibilities in the systems CaO–Y2O3–ZrO2 and CaO–ZrO2–SiO2 and put into perspective with previous work on both, natural and synthetic hot corrosion deposits.