Corrosion of oxide dispersion strengthened iron–chromium steels and tantalum in fluoride salt coolant: An in situ compatibility study for fusion and fusion–fission hybrid reactor concepts
Corrosion of oxide dispersion strengthened iron–chromium steels and tantalum in fluoride salt coolant: An in situ compatibility study for fusion and fusion–fission hybrid reactor concepts
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DOI：
10.1016/j.jnucmat.2011.07.036
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发表时间：
2011-12
影响因子：
3.1
通讯作者：
B. El-dasher;J. Farmer;J. Ferreira;M. Caro;A. Rubenchik;A. Kimura
中科院分区：
文献类型：
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作者：
B. El-dasher;J. Farmer;J. Ferreira;M. Caro;A. Rubenchik;A. Kimura
未来核电站的主要候选材料类别，无论是裂变、聚变还是混合，包括氧化物弥散强化（ODS）铁素体钢，其依赖于纳米氧化物颗粒在基体中的分散以获得机械强度和抗膨胀性，或钽合金，其具有固有的中子诱导抗膨胀性和高温强度。对于高温操作，低共熔熔融含锂氟化物盐是有吸引力的，因为它们的增殖能力以及它们相对高的热容量，这允许更高的平均操作温度，这增加了功率产生。在本文中，我们测试了Flinak（LiF-NaF-KF）盐对ODS钢的相容性，比较了京都大学开发的当前一代ODS钢与商业合金MA 956的性能。纯钽也进行了测试，用于比较目的。使用定制的高温电化学阻抗谱电池获得600至900°C温度范围内的原位数据。ODS钢的结果表明，由于在表面形成富铝层，钢/冷却剂界面阻力从600 °C增加到800°C，然而温度增加到900°C会导致该层破裂并发生侵蚀性侵蚀。当前一代ODS钢的性能超过了MA 956 ODS钢，其原位阻抗行为类似于或优于纯钽的阻抗行为。
Primary candidate classes of materials for future nuclear power plants, whether they be fission, fusion or hybrids, include oxide dispersion strengthened (ODS) ferritic steels which rely on a dispersion of nano-oxide particles in the matrix for both mechanical strength and swelling resistance, or tantalum alloys which have an inherent neutron-induced swelling resistance and high temperature strength. For high temperature operation, eutectic molten lithium containing fluoride salts are attractive because of their breeding capability as well as their relatively high thermal capacity, which allow for a higher average operating temperature that increases power production. In this paper we test the compatibility of Flinak (LiF–NaF–KF) salts on ODS steels, comparing the performance of current generation ODS steels developed at Kyoto University with the commercial alloy MA956. Pure tantalum was also tested for comparative purposes. In situ data was obtained for temperatures ranging from 600 to 900°C using a custom-built high temperature electrochemical impedance spectroscopy cell. Results for ODS steels show that steel/coolant interfacial resistance increases from 600 to 800°C due to an aluminum enriched layer forming at the surface, however an increase in temperature to 900°C causes this layer to break up and aggressive attack to occur. Performance of current generation ODS steels surpassed that of the MA956 ODS steel, with an in situ impedance behavior similar or better than that of pure tantalum.