Architecture of thermal barrier coatings produced by electron beam-physical vapor deposition (EB-PVD)
Architecture of thermal barrier coatings produced by electron beam-physical vapor deposition (EB-PVD)
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DOI：
10.1023/a:1016187101616
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发表时间：
2002-08-01
影响因子：
4.5
通讯作者：
Singh, J
中科院分区：
文献类型：
--
作者：
Singh, J;Wolfe, DE;Singh, J
飞行器发动机的热段在运行期间的极高温度和恶劣的大气条件导致涡轮机部件的退化和结构故障。更换这些组件非常昂贵。通过电子束物理气相沉积（EB-PVD）在涡轮机部件上涂覆的由ZrO 2 - 8wt%Y2O3（8 YSZ）组成的热障涂层（TBC）提供了优异的热保护和抗氧化引起的侵蚀和腐蚀性能。然而，由于TBC的过早失效，涡轮机部件的寿命仍然有限。假设通过产生多个不明显或明显的界面和合金添加物（例如Nb-氧化物）来降低TBC的热导率，可以延长涂覆部件的寿命，所述合金添加物将导致热导率和通过涂层的氧传输的降低。本文介绍了EB-PVD沉积的标准8 YSZ、层状8 YSZ、Nb-O合金化8 YSZ和Nb-O功能梯度8 YSZ的显微组织结果。通过扫描电子显微镜（SEM）、高分辨率光学显微镜（OM）、X射线衍射（XRD）和热循环试验等方法对TBC样品进行了检测。初步结果表明，多界面TBC具有更好的抗氧化性能相比，标准和合金TBC。(C)2002 Kluwer Academic Publishers.
Extremely high temperatures and severe atmospheric conditions in the hot section of aircraft engines during operation result in degradation and structural failures of turbine components. Replacing these components is very expensive. Thermal barrier coatings (TBC) composed of ZrO2- 8wt% Y2O3( 8YSZ) applied by Electron Beam-Physical Vapor Deposition (EB-PVD) to turbine components offer excellent properties for thermal protection and resistance against oxidation - induced erosion and corrosion. However, the life of turbine components is still limited due to premature failure of the TBC. It is hypothesized that the life of the coated components can be extended by lowering the thermal conductivity of the TBC by creating multiple non-distinct or distinct interfaces and alloy additions such as Nb-oxide which will result in a reduction in the thermal conductivity and oxygen transport through the coating. This paper presents the microstructural results of standard 8YSZ, layered 8YSZ, Nb-oxide alloyed 8YSZ and functionally graded 8YSZ with Nb-oxide deposited by EB-PVD. TBC samples were examined by various methods including scanning electron microscopy (SEM), high-resolution optical microscopy (OM), X-ray diffraction (XRD), and thermal cycling tests. The preliminary results strongly suggest that multiple interfaced TBC exhibits better oxidation resistant properties as compared to standard and alloyed TBC. (C) 2002 Kluwer Academic Publishers.