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微管SOFC复合支撑体NiO/La0.7Ca0.3CrO3-δ的相转化纺丝法制备与性能 预览

Preparation and characterization of composite support NiO/La0.7Ca0.3CrO3-δby phase-conversion spinning method for micro-tubular SOFC
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摘要 采用固相反应法合成La0.7Ca0.3CrO3-δ(LCC)粉体,用相转化纺丝法制备NiO/LCC(1:1)中空纤维膜,1400°C空气中烧结作为微管固体氧化物燃料电池的复合支撑体。借助粒度分析仪、热分析仪、X射线衍射仪、扫描电镜、四端子测量仪、热膨胀仪、万能材料试验机等对复合支撑体的粉体粒度、烧结性能、致密度、断面微结构、电导性能、热膨胀性能和抗弯强度进行分析。结果表明:LCC与NO粉体在1400C的电池共烧温度下化学性质稳定,烧结性能良好。微管断面总体呈现表面皮层和内部双层径向平行排列且均勻分布的手指状孔隙结构,孔隙率达到60.6%,还原后的孔隙率增加到68.1%。纯H2中的电导率随温度升高而降低,700C时达到10.8S.cm^-1。还原前后的抗弯强度分别为39.6MPa和33.2MPa,热膨胀系数TEC为12.4X10^-6K^-1,与其他电池材料相匹配。 Using solid-phase reaction process to synthesize La0.7Ca0.3CrO3-δ(LCC)primary powder,composite hollow fiber membrane of NiO/LCC(1:1)was prepared by phase-conversion spinning method and then sintered at 1400C in air as micro-tubular solid oxide fuel cells(SOFC)support.The particle size distribution,TG-DTA thermal analysis,structure,morphologies,electrical conductivity,thermal expansion and bending strength were characterized by laser particulate size analyzer,thermal analyzer,X-ray diffraction,scanning electron microscopy,standard DC four-probe technique,thermal expansion dilatometer and universal material testing machine.Results indicate that LCC and NO powders have considerable chemical and sintering compatibilities at SOFC co-tiring temperature(1400 C).The fracture section of the hollow fiber membrane exhibits a sandwich-like structure with homogeneous porous surfaces.Two layers of obviously bigger parallel finger-like pores distribute uniformly between the inner and outer surfaces of the microtubule section.The porosity of the sample is 60.6%,and increases to a relatively high value of 68.1%after reduction.Electrical conductivity of the sintered specimen decreases as the temperature increasing in pure H2.The value reaches 10.8S.cm-1 at 700C.Bending strength before and after reduction are 39.6MPa and 33.2MPa respectively.Thermal expansion coeflicient(TEC)value of the NiO/LCC hollow fiber membrane gets to 12.4 X 10^-6 K^-1,which is very close to that of other SOFC components,such as NiO/YSZ anode and LCC interconnect.
作者 王松林 徐向棋 王东生 WANG Song-lin;XU Xiang-qi;WANG Dong-sheng(Department of Mechanical Engineering,Tongling University,Tongling 244061,Anhui,China)
出处 《材料工程》 EI CAS CSCD 北大核心 2019年第2期42-48,共7页 Journal of Materials Engineering
基金 安徽省髙校自然科学研究重点项目(KJ2017A468) 国家自然科学基金项目(1301122) 安徽省髙校优秀青年人才支持计划重点项目(gxyqzd2016318).
关键词 微管固体氧化物燃料电池(微管SOFC)中空纤维膜 烧结性能 电导率 micro-tubular SOFC hollow fiber membrane sintering ability electrical conductivity
作者简介 通讯作者:王松林(1973-),男,教授,博士后,主要从事固体氧化物燃料电池关键材料研究,联系地址:安徽省铜陵市翠湖四路1335号铜陵学院机械工程学院(244061),E-mail:ws-hf@126.com
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