Y-rich oxide distribution in plasma sprayed MCrAlY-coatings studied by SEM with a cathodoluminescence detector and Raman spectroscopy
Y-rich oxide distribution in plasma sprayed MCrAlY-coatings studied by SEM with a cathodoluminescence detector and Raman spectroscopy
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DOI：
10.1016/j.surfcoat.2009.08.034
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发表时间：
2009-11
影响因子：
5.4
通讯作者：
A. Gil;D. Naumenko;R. Vaßen;J. Toscano;M. Subanovic;L. Singheiser;W. Quadakkers
中科院分区：
文献类型：
--
作者：
A. Gil;D. Naumenko;R. Vaßen;J. Toscano;M. Subanovic;L. Singheiser;W. Quadakkers
采用SEM阴极发光（CL）成像和拉曼光谱研究了MCrAlY涂层在不同制备阶段和氧化暴露过程中富Y氧化物颗粒的化合物类型、分布和形貌。与传统的SEM/EDX相比，CL可以以亚微米的高分辨率轻松检测富Y氧化物，并可快速获取图像。此外，基于波长分辨的拉曼光谱并且在某些情况下还使用CL光谱的富Y氧化物化合物的相分析是可能的。阴极射线发光和拉曼光谱研究的结果表明，热处理后的富Y氧化物相的类型可以与涂层中的金属Y的含量和/或水库。因此，这些分析方法有可能被应用为（非破坏性）质量控制方法在MCrAlY涂层的制造。在制造过程中形成的富Y氧化物沉淀物的分布已被证明会影响氧化铝鳞片在使用过程中的生长速率和机械稳定性。因此，MCrAlY涂层中的Y-氧化物分布代表影响覆盖层和TBC涂层寿命的因素。
SEM cathodoluminescence (CL) imaging and Raman spectroscopy were used to study the compound type, distribution and morphology of Y-rich oxide particles in MCrAlY-coatings at various stages of the manufacturing and oxidation exposure. Compared to conventional SEM/EDX, CL allows easy detection of Y-rich oxides at a high, sub-µm resolution with a fast image acquisition. Furthermore, phase analysis of the Y-rich oxide compounds based on the wavelength resolved Raman spectra and in some cases also using CL-spectra is possible. The presented results of the cathodoluminescence and Raman spectroscopy studies indicate that the type of the Y-rich oxide phases after heat-treatment can be correlated with the content and/or reservoir of metallic Y in the coating. Hence, these analytical methods have potential to be applied as (non-destructive) quality control methods in the manufacturing of MCrAlY-coatings. The distribution of the Y-rich oxide precipitates formed during manufacturing has been shown to affect the growth rate and mechanical stability of the alumina scales during service. Y-oxide distribution in the MCrAlY-coatings, therefore, represents a factor, which influences the lifetime of overlay and TBC-coatings.