Optimization of the electrical properties of Ti-Nb stabilized ferritic stainless steel SOFC interconnect alloy upon high-temperature oxidation: The role of excess Nb on the interfacial oxidation at the oxide-metal interface

被引：24
作者：
Ali-Loytty, H. [1 ]
Jussila, P. [1 ]
Valden, M. [1 ]
机构：
[1] Tampere Univ Technol, Surface Sci Lab, FIN-33101 Tampere, Finland
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2013年 / 38卷 / 02期
基金：
芬兰科学院;
关键词：
Stainless steel; Interfaces; Oxidation; Solid oxide fuel cell; X-ray photoelectron spectroscopy; Electrochemical impedance spectroscopy; FE-CR ALLOY; ROOM-TEMPERATURE; INITIAL-STAGES; FUEL-CELLS; DIFFUSION; NIOBIUM; IRON; ENRICHMENT; MANGANESE; ELEMENTS;
D O I：
10.1016/j.ijhydene.2012.10.087
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Interfacial oxidation of Nb and Si at 650 degrees C on Laves phase forming Ti-Nb stabilized ferritic stainless steel (Fe-19Cr-0.9Si-0.2Nb-0.1Ti (at.%), grade EN 1.4509) was studied by electrochemical impedance spectroscopy and photoelectron spectroscopy. It was found that excess Nb efficiently hinders the formation of electrically resistive SiO2 layer at the oxide-metal interface. The beneficial role of Nb was attributed to its high segregation rate and the formation of conductive oxides at the interface. However, the oxidation was strongly influenced by age-precipitation of the Laves (FeNbSi)-type intermetallic phase, which removed free Nb from the alloy solution and thus allowed SiO2 layer to form more easily. These results can be applied to optimize the oxide scale composition by Nb alloying of the ferritic stainless steel to maintain high performance under various operation conditions, particularly in solid oxide fuel cell applications. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：1039 / 1051
页数：13
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