| 摘要: |
| 为了提高核燃料包壳材料的抗高温氧化性能，采用粉末冶金技术制备 FeCrAl 基氧化物弥散强化合金(FeCrAl-ODS), 在高达 1 100 ℃和 1 200 ℃的高温湿空气中氧化不同时间，采用 SEM、XRD、EDS 和 TEM 等多种分析技术对 FeCrAl-ODS 合金氧化试样进行显微组织定性和定量分析。FeCrAl-ODS 合金在 1 200 ℃的增重比在 1 100 ℃的快，但是氧化动力学曲线的增长趋势是一致的，最初几小时氧化增重都很快，然后随着保护性氧化物的形成而减慢。由于氧势梯度的存在，氧化层表面有富 Al-Y-Ti-Zr-O 的析出物，随着氧化时间的延长，析出物相更加明显，致密规则的氧化层很好地黏附在合金材料上。FeCrAl-ODS 合金在高达 1 100 ℃和 1 200 ℃的高温湿空气中，合金表面形成致密规则的氧化层提高了合金的抗高温氧化性能，能够有效提高核燃料元件的寿命和安全可靠性。通过研究高温湿空气中 FeCrAl-ODS 包壳材料氧化层的显微组织，可对该合金的开发、制备和应用提供一定的理论指导和技术支持。 |
| 关键词: FeCrAl-ODS 氧化层 高温氧化 显微组织 包壳材料 |
| DOI：10.11933/j.issn.1007-9289.20210924001 |
| 分类号:TG156;TB114 |
| 基金项目:国家自然科学基金(52071168)和云南省稀贵金属材料基因(202002AB080001)资助项目 |
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| Microstructure of Oxide Scale Formed on FeCrAl-ODS Cladding Material under High-Temperature Moist Air |
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Li Qing1, Li Zhenhua1, Song Peng1, Zhang Ruiqian2, Long Dijun2, Huang Taihong1
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1.Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093 , China;2.Key Laboratory of Reactor Fuel and Material, Nuclear Power Institute of China, Chengdu 610213 , China
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| Abstract: |
| To improve the high-temperature oxidation resistance of nuclear fuel cladding materials, FeCrAl-based oxide dispersion strengthened steel (FeCrAl-ODS) is developed by powder metallurgy technology. The FeCrAl-ODS alloy is oxidized in high-temperature moist air at 1 100 ℃ and 1 200 ℃ for different times. The microstructure of oxidized FeCrAl-ODS alloy is qualitatively and quantitatively analyzed by SEM, XRD, EDS and TEM. The weight gain of FeCrAl-ODS alloy at 1 200 ℃ is faster than that at 1 100 ℃, but the growth trend of oxidation kinetics curve is consistent. The oxidation weight gain is very fast in the first few hours, and then slows down with the formation of protective oxides. Due to the existence of oxygen potential gradient, Al-Y-Ti-Zr-O-rich precipitates are observed on the surface of the oxide layer. With the extension of oxidation time, the precipitates became more obvious, and the dense and regular oxide layer adhered well to the alloy material. The dense and regular oxide layer formed on the surface of FeCrAl-ODS alloy in high-temperature wet air up to 1 100 ℃ and 1 200 ℃ can improve the high-temperature oxidation resistance of the alloy, and can effectively improve the service life, safety and reliability of nuclear fuel elements. The study of the microstructure of oxide scale formed on FeCrAl-ODS cladding material under high-temperature moist air can provide some theoretical guidance and technical support for the development, preparation and application of the alloy. |
| Key words: FeCrAl-ODS oxide layer high-temperature oxidation microstructure cladding material |
