Initial oxidation behavior of Fe-Cr-Si alloys in 1200°C steam

JOURNAL OF NUCLEAR MATERIALS

卷:513

Article

Moon, Joonho¹  Kim, Sungyu¹  Park, Won Dong¹  Kim, Tae Yong²  McAlpine, Samuel Westcott³  Short, Michael P.³  Kim, Ji Hyun²  Bahn, Chi Bum¹ 

[1] Pusan Natl Univ, Sch Mech Engn, Busan 46241, South Korea

[2] UNIST, Sch Mech & Nucl Engn, Dept Nucl Engn, Ulsan 44919, South Korea

[3] MIT, Dept Nucl Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA

关键词: Accident-tolerant fuel cladding;    Fe-Cr-Si alloy;    High-temperature oxidation test;    Amorphous SiO2 layer;   

DOI  :  10.1016/j.jnucmat.2018.10.010

来源: Elsevier

【 摘 要 】

Accident-tolerant fuel (ATF) cladding with high oxidation resistance during severe accidents is of critical importance to light water reactor safety and sustainability. One newly proposed ATF cladding concept, a multi-metallic layered composite (MMLC), hinges upon the oxidation resistance of an outer Fe-Cr-Si layer on top of a Zr-based alloy, separated by barrier layers to avoid Fe-Zr eutectic formation. The initial oxidation resistance of three potential Fe-Cr-Si alloys was evaluated by exposing them to 1200 degrees C oxidizing steam for up to one hundred seconds, along with a Zr-Nb-Sn alloy as a reference. The oxidation resistance of Fe12Cr2Si and Fe16Cr2Si was poor, exhibiting a porous, incomplete multilayer oxide composed mainly of mixed Fe/Cr/Si spinels. However, Fe20Cr2Si showed excellent oxidation resistance due to a continuous amorphous SiO2 layer formed at the metal-oxide interface, followed by almost fully dense Cr2O3. This motivates the consideration of Fe-Cr-Si alloys as an additional ATF design choice, similar to FeCrAl alloys in performance and oxidation resistance mechanism. (C) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

Free