Characterization by Photoluminescence and Raman Spectroscopy of the Oxide Scales Grown on the PM2000 at High Temperatures

IF 2.4 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Molecular and Engineering Materials Pub Date : 2019-09-25 DOI:10.1142/s2251237319500035
Samiha Hakkar, S. Achache, F. Sanchette, Z. Mekhalif, N. Kamoun, A. Boumaza
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引用次数: 6

Abstract

The microstructural change of a thermal oxidation on a PM2000 superalloy was investigated after a 48 h isothermal heat-treatment. The oxides (transitions aluminas, [Formula: see text]-alumina and mixed oxides) were characterized using the Raman spectroscopy, the Photoluminescence (PL) spectroscopy, MEB observations and the X-ray diffraction for temperatures between 600°C and 1200°C. The X-ray diffraction results under conventional incidence conditions make it possible to estimate the crystallites size and the specific surfaces of the [Formula: see text]-alumina. The PL analyses at various excitation wavelengths (200[Formula: see text]nm, 234[Formula: see text]nm, 326[Formula: see text]nm and 532[Formula: see text]nm) provide important information on the existing defects (intrinsic and extrinsic) according to the oxidation temperature. The Raman spectroscopy ([Formula: see text].18[Formula: see text]nm) gives the various signatures of the various alumina generated ([Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text]-Al2O3).
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高温下PM2000上生长的氧化皮的光致发光和拉曼光谱表征
研究了PM2000高温合金经48小时等温热处理后热氧化的微观结构变化。在600°C至1200°C的温度下,使用拉曼光谱、光致发光(PL)光谱、MEB观察和X射线衍射对氧化物(过渡氧化铝,[公式:见正文]-氧化铝和混合氧化物)进行了表征。常规入射条件下的X射线衍射结果可以估计[公式:见正文]-氧化铝的晶粒尺寸和比表面。根据氧化温度,在各种激发波长(200[公式:见正文]nm、234[公式:见图正文]nm,326[公式:见正文]nm和532[公式:看正文]nm)下的PL分析提供了关于存在缺陷(内在和外在)的重要信息。拉曼光谱([公式:见正文].18[公式:看正文]nm)给出了所生成的各种氧化铝的各种特征([公式,见正文]、[公式,看正文]、【公式,见文本】和【公式,看文本】-Al2O3)。
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Journal of Molecular and Engineering Materials
Journal of Molecular and Engineering Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
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