Conductivity and Oxidation Behavior of Fe-16Cr Alloy as Solid Oxide Fuel Cell Interconnect Under Long-Stability and Thermal Cycles

• 作者: Jianwu Zhou Qiangfeng Chen Junkang Sang Rongmin Wu Zhuobin Li Wanbing Guan
• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2021,（5）
• 页码范围: 668-674
• 页数: 7页
• 语种: 英文

摘要

Conductivity and oxidation behavior of Fe-16Cr alloy were investigated under long-term stability operation at 750℃and thermal cycles from room temperature to 750℃.The results showed that the area specific resistance(ASR)of Fe-16Cr alloy increased over time and reached about 56.29 mΩ cm2 after 40,000 h of long-term stability operation at 750℃by theoretical calculation.The ASR of Fe-16Cr remained about 11 mΩ cm2 after 52 thermal cycles from room temperature to 750℃.The analysis of structure showed that the oxidized phase on the surface of Fe-16Cr was mainly composed of Cr2O3 and FeCr2O4 spinel phase under long-term stability operation at 750℃.While the Cr2O3 phase was mainly observed on the surface of Fe-16Cr alloy after 52 thermal cycles,the oxidation rates of Fe-16Cr alloy were 0.0142 μm h-1 and 0.06 μm cycle-1 under long-term stability operation and under thermal cycle,respectively.The property of Fe-16Cr alloy with 2.6 mm thickness met the lifespan requirement of interconnect for solid oxide fuel cell(SOFC)stacks.The Cr element all diffused onto oxidation surface,indicating that it was necessary to spray a coating on the surface to avoid poisoning cell cathode of SOFCs.Two 2-cell stacks were assembled and tested to verify the properties of Fe-16Cr alloy as SOFC interconnect under long-term stability operation and thermal cycle condition.