Chromium-oxide Growth on Fe–Cr–Ni Alloy Studied with Grazing-emission X-ray Fluorescence
Chromium-oxide Growth on Fe–Cr–Ni Alloy Studied with Grazing-emission X-ray Fluorescence
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DOI：
10.1007/s11085-007-9053-2
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发表时间：
2007-05
影响因子：
2.2
通讯作者：
I. Koshelev;A. Paulikas;M. Beno;G. Jennings;J. Linton;M. Grimsditch;S. Uran;B. Veal
中科院分区：
文献类型：
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作者：
I. Koshelev;A. Paulikas;M. Beno;G. Jennings;J. Linton;M. Grimsditch;S. Uran;B. Veal
采用掠射X射线荧光（GEXRF）技术，研究了55 Fe-25 Cr-20 Ni和55 Fe-25 Cr-20 Ni（+0.3Y）（wt.%）合金的等温氧化过程。在750 °C下，在O2中，研究了氧化时间的函数。此外，还研究了热循环对复合材料性能的影响。使用GEXRF，氧化物的厚度，在衬底中的Cr-耗尽区，和Fe和Ni的浓度在氧化物中作为氧化时间的函数进行监测。扫描电子显微镜被用来独立地测量铬耗尽区。拉曼光谱用于测量氧化早期（小于2 h）氧化物中出现的Fe 2 O3的浓度。GEXRF和拉曼测量结果表明，热生长的氧化铬净化延长氧化，最初丰富的Fe 2 O3氧化后2小时变得不可检测。然而，总铁浓度在2小时后仍为约3%，但随着进一步氧化而系统地降低。热循环对这些结果没有影响。
Using grazing-emission X-ray fluorescence (GEXRF), isothermal oxidation of the alloys 55Fe–25Cr–20Ni and 55Fe–25Cr–20Ni(+0.3Y) (wt.%) were studied as a function of oxidation time at 750 °C in O2. In addition, the effect of thermal cycling was studied. Using GEXRF, oxide thickness, the Cr-depletion zone in the substrate, and Fe and Ni concentrations in the oxide were monitored as a function of oxidation time. Scanning-electron microscopy was used to independently measure the Cr-depletion zone. Raman spectroscopy was used to measure the concentration of Fe2O3appearing in the oxides in early oxidation (less than 2 h). Both GEXRF and Raman measurements show that the thermally-grown chromium oxide purifies with extended oxidation; initially abundant Fe2O3became undetectable after 2 h of oxidation. However, the total Fe concentration was still ∼3% after 2 h but systematically decreased with further oxidation. Thermal cycling had no effect on these results.