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首页> 外文会议>2003 International Thermal Spray Conference Vol.2; May 5-8, 2003; Orlando, Florida, USA >A Raman Study on Plasma-Sprayed Thermal Barrier Coatings During Thermal Cycling
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A Raman Study on Plasma-Sprayed Thermal Barrier Coatings During Thermal Cycling

机译：热循环过程中等离子喷涂热障涂层的拉曼研究

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摘要

Yttria Partially Stabilized Zirconia (YPSZ) coatings are used as Thermal Barrier Coatings (TBCs) because of their capability to improve gas turbine performance by allowing higher turbine inlet temperature and reduced cooling air flow. Usually, YPSZ layers are applied by plasma spray on Ni-based superalloys pre-coated with a bond coat layer of MCrAlY, where M is Co, Ni, or both. In this work we used Raman spectroscopy to study the performance of TBCs during thermal cycling at two different temperature (1273K and 1373K). Raman scattering is capable of detecting monoclinic zirconia and to analyze residual stresses of the coatings with an higher sensitivity than traditional X-ray diffraction measurements. Raman spectra were analyzed by deconvolution methods in order to study the evolution of the relative intensities and position of different bands. We found that the position of the 635 cm~(-1) band shifts to higher values of wave number during thermal cycling and by comparing this data with those reported in literature, it is possible to retrieve the value of residual stresses in zirconia coating. We also observed a relation between the intensities of the bands at 602 cm~(-1) and 635 cm~(-1) band and the number of thermal cycles performed.
机译：氧化钇部分稳定的氧化锆（YPSZ）涂层用作热障涂层（TBC），因为它们能够通过允许更高的涡轮进口温度和减少冷却空气流量来改善燃气轮机性能。通常，通过等离子喷涂将YPSZ层施加到预涂有MCrAlY粘结涂层的Ni基高温合金上，其中M为Co，Ni或两者。在这项工作中，我们使用拉曼光谱研究了两种不同温度（1273K和1373K）的热循环过程中TBC的性能。拉曼散射能够检测单斜晶氧化锆，并能够以比传统X射线衍射测量更高的灵敏度分析涂层的残余应力。通过反卷积方法分析拉曼光谱，以研究不同谱带的相对强度和位置的演变。我们发现，在热循环过程中，635 cm〜（-1）谱带的位置移至更高的波数值，并将此数据与文献报道的数据进行比较，就有可能获得氧化锆涂层中的残余应力值。我们还观察到了602 cm〜（-1）和635 cm〜（-1）波段的强度与进行的热循环次数之间的关系。

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