不锈钢连接体用Ce掺杂Cu-Fe尖晶石涂层研究  

Research on Ce doped Cu-Fe spinel coating for stainless steel interconnects

作　　者：刘雨婷 史冬阳[1,2] 潘玥 LIU Yuting;SHI Dongyang;PAN Yue(Jiangxi Provincial Key Laboratory of Green and Low Carbon Metallurgy for Strategic Nonferrous Metals,Ganzhou 341000,China;School of Metallurgical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Ganzhou Engineering Technology Research Center of Green Metallurgy and Process Intensification,Ganzhou 341000,China)

机构地区：[1]战略有色金属绿色低碳冶金江西省重点实验室,赣州341000 [2]江西理工大学冶金工程学院,赣州341000 [3]赣州市绿色冶金与过程强化工程技术研究中心,赣州341000

出　　处：《江西冶金》2025年第2期140-146,共7页Jiangxi Metallurgy

基　　金：战略有色金属绿色低碳冶金江西省重点实验室项目(2024SSY11031);江西省自然科学基金青年基金项目(20242BAB20161);江西省教育厅科学技术研究项目(GJJ210834);江西理工大学科研启动基金项目(2021027)。

摘　　要：Cu-Fe尖晶石涂层具有较高的电导率、热膨胀系数(CTE)与不锈钢基体匹配度高、生产成本较低等优势,广泛应用于固体氧化物燃料电池(SOFC)连接体材料。为了进一步提高不锈钢连接体的高温抗氧化性能,延长使用寿命,需要对涂层进行稀土改性。本研究采用溶胶凝胶法合成不同Ce掺杂量CuCe_(x)Fe_(2-x)O_(4)(x=0,0.02,0.04)的尖晶石基粉体材料,考察了Ce掺杂量对其导电性能的影响。此外,利用浸渍提拉技术在SUS430不锈钢基体表面沉积了Cu-Fe-Ce尖晶石涂层,并对比分析了裸钢和涂层钢的高温氧化行为。结果表明,在CuFe_(2)O_(4)尖晶石中,适量的Ce取代Fe可降低材料的活化能,提高材料的导电性能,并且CuCe_(0.02)Fe_(1.98)O_(4)尖晶石涂层有效地抑制了Cr的外扩散和Cr_(2)O_(3)层的生长。因此,用Ce掺杂Cu-Fe尖晶石涂层提高了不锈钢连接体的高温抗氧化性和导电性,降低了氧化膜的面比电阻,对不锈钢连接体的高温防护具有重大意义。Cu-Fe spinel coatings has attracted a lot of attentions in the application of solid oxide fuel cell(SOFC)interconnects,because of its high electrical conductivity,thermal expansion coefficient(CTE)matching with stainless steel and low cost.In order to further improve the high temperature oxidation resistance and service life of stainless steel interconnects,it is necessary to modify the coating with rare earth.In this research,spinel based powders with different Ce doping amounts CuCe_(x)Fe_(2-x)O_(4)(x=0,0.02 and 0.04)were synthesized by sol-gel method,and the effect of Ce doping amount on the electrical conductivity of powders was investigated.In addition,Cu-Fe-Ce spinel coating was deposited on the surface of SUS430 stainless steel substrate by dip-coating technique.At the same time,the oxidation behaviors of bare steel and coated steel at high temperature were studied.The results showed that the appropriate Ce substitution for Fe in CuFe_(2)O_(4) spinel can reduce the activation energy and further improve the conductivity of the material.Furthermore,CuCe_(0.02)Fe_(1.98)O_(4) spinel coating effectively inhibited both the external diffusion of Cr and the growth of Cr_(2)O_(3) layer.Therefore,Ce doped Cu-Fe spinel coating can improve the high temperature oxidation resistance and electrical conductivity of the stainless steel interconnects,and reduce the surface specific resistance of the oxide films,which has great significance for the high temperature protection of the steel interconnects.

关 键 词：固体氧化物燃料电池 不锈钢连接体 尖晶石涂层 抗氧化性能 

分 类 号：TM911[电气工程—电力电子与电力传动] TG147[一般工业技术—材料科学与工程]