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The Effect of CO2 Pressure on Chromia Scale Microstructure at 750 degrees C

机译：二氧化碳压力对750摄氏度染色尺度微观结构的影响

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摘要

To understand and model performance in supercritical CO2 (sCO(2)) for high-efficiency, concentrating solar power (CSP) and fossil energy power cycles, reaction rates are compared at 750A degrees C in 0.1 MPa CO2 and 30 MPa sCO(2) as well as laboratory air as a baseline on structural materials such as Ni-based alloy 625. Due to the thin reaction products formed even after 5000 h, scanning transmission electron microscopy was used to study the Cr-rich surface oxide scale. The scales formed in CO2 and sCO(2) had a much finer grain size with more voids observed in CO2. However, the observations on alloy 625 were complicated by Mo and Nb-rich precipitates in the adjacent substrate and Al internal oxidation. To simplify the system, a binary Ni-22Cr alloy was exposed for 1000 h in similar environments. After exposure in sCO(2), there was an indication of carbon segregation detected on the Cr2O3 grain boundaries. After exposure in air, metallic Ni precipitates were observed in the scale that were not observed in the scale formed on alloy 625. The scale formed in air on a second Ni-22Cr model alloy with Mn and Si additions did not contain Ni precipitates, suggesting caution when drawing conclusions from model alloys.
机译：为了了解和模型性能，在超临界CO2（SCO（2））以进行高效，集中的太阳能（CSP）和化石能源循环，在0.1MPa CO 2和30 MPa SCO（2）中将反应速率与750A℃进行比较以及实验室空气作为诸如Ni基合金625的结构材料的基线。由于即使在5000H之后形成的薄反应产物，则使用扫描透射电子显微镜研究Cr的表面氧化物尺度。在CO2和SCO（2）中形成的鳞片具有更精细的粒度，在CO 2中观察到更多的空隙。然而，对相邻基材和Al内氧化的Mo和Nb富沉淀物对合金625的观察结果。为了简化系统，在类似环境中暴露二元NI-22CR合金1000小时。在SCO（2）中暴露后，在CR2O3晶界上检测到碳偏析的指示。在空气中暴露后，在合金625上形成的规模中未观察到的标度中观察到金属Ni沉淀物。在第二个Ni-22Cr Model合金的空气中形成的尺度与Mn和Si添加不含Ni沉淀物，表明在绘制模型合金的结论时小心。

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