基于应力分析Ni-Fe合金支撑固体氧化物燃料电池结构稳定性研究

doi:10.15541/jim20180398

无机材料学报 ›› 2019, Vol. 34 ›› Issue (6): 611-617.DOI: 10.15541/jim20180398 CSTR: 32189.14.10.15541/jim20180398

基于应力分析Ni-Fe合金支撑固体氧化物燃料电池结构稳定性研究

李凯¹,李霄¹,李箭²,谢佳苗³

^1. 西安石油大学材料科学与工程学院, 西安 710065
^2. 华中科技大学材料科学与工程学院, 材料成型及模具技术国家重点实验室, 武汉 430074
^3. 西北工业大学工程力学系, 西安 710065

收稿日期:2018-09-03 修回日期:2018-11-12 出版日期:2019-06-20 网络出版日期:2019-05-23
作者简介:李凯(1985-), 男, 讲师. E-mail: likai3611897@126.com
基金资助:
国家自然科学基金青年科学基金项目(51702258);华中科技大学材料成型与模具技术国家重点实验室开放课题研究基金(P2017-005);陕西省教育厅专项科研计划项目(17JK0598)

Structural Stability of Ni-Fe Supported Solid Oxide Fuel Cells Based on Stress Analysis

Kai LI¹,Xiao LI¹,Jian LI²,Jia-Miao XIE³

^1. School of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, China;
^2. State Key Laboratory for Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
^3. Department of Engineering Mechanics, Northwestern Polytechnical University, Xi’an 710065, China;

Received:2018-09-03 Revised:2018-11-12 Published:2019-06-20 Online:2019-05-23
Supported by:
National Natural Science Foundation of China(51702258);Open Fund of State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology(P2017-005);Scientific Research Plan Projects of Shaanxi Province Education Department(17JK0598)

摘要/Abstract

摘要：

本文以NiO和Fe₂O₃为原料, 应用流延、丝网印刷、高温共烧结和原位还原的工艺制备多孔金属支撑固体氧化物燃料电池(MS-SOFC)。系统研究了支撑体中Fe含量对MS-SOFC的残余应力、抗弯断裂强度和电化学稳定性的影响。结果表明, 在NiO中加入10at% Fe₂O₃, 使得支撑体致密化开始温度提高到937 ℃, 残余应力和变形翘曲度分别低至70 MPa和0.15 mm; 电池还原之后, Ni_0.9Fe_0.1支撑SOFC骨架表面孔隙率为40.22%, 抗弯断裂强度达到最大值62.34 MPa; 电化学测试过程中, Ni_0.9Fe_0.1支撑SOFC在650 ℃下, 以H₂为燃料, 在400 mA·cm ^-2电流密度下可以稳定运行60 h, 主要因为电池具有较高的抗弯断裂强度, 能够抵抗运行过程中的热应力。该研究工作为MS-SOFC结构设计和性能稳定性优化提供重要的理论依据。

关键词: 金属支撑固体氧化物燃料电池, Ni-Fe合金支撑体, 热应力

Abstract:

Metal supported solid oxide fuel cells (MS-SOFCs) were fabricated with NiO and Fe₂O₃ by tape casting, screen printing, sintering and in-situ reducing process with NiO and Fe₂O_3. The fraction effects of Fe on residual stress, bending strength and electrochemical stability of MS-SOFC were systematically investigated. The addition of 10at% Fe₂O₃ in characteristic support elevated densification starting temperature up to 937 ℃, and reduced residual stress and buckling deformation to 70 MPa and 0.15 mm, respectively. After reduction, Ni_0.9Fe_0.1supported SOFC presented the maximum bending strength of 62.34 MPa due to the lowest porosity of 40.22% in metal scaffold. MS-SOFC steadily operated for 60 h in durability test with H₂ as the fuel at a constant current density of 400 mA·cm ^-2 and 650 ℃. This superior performance was attributed to the higher fracture strength of Ni_0.9Fe_0.1alloy support SOFC, which effectively resisted the thermal stress in operation. This research provides a promising theoretical basis for structure design and optimization of MS-SOFC.

Key words: metal supported solid oxide fuel cell, Ni-Fe alloy support, thermal stress

中图分类号:

TQ174

李凯, 李霄, 李箭, 谢佳苗. 基于应力分析Ni-Fe合金支撑固体氧化物燃料电池结构稳定性研究[J]. 无机材料学报, 2019, 34(6): 611-617.

Kai LI, Xiao LI, Jian LI, Jia-Miao XIE. Structural Stability of Ni-Fe Supported Solid Oxide Fuel Cells Based on Stress Analysis[J]. Journal of Inorganic Materials, 2019, 34(6): 611-617.

图/表 10

表1 MS-SOFC部件材料属性

Table 1 Material properties of MS-SOFC components

Materials	Temperature/℃	Elasticity modulus/GPa	Poisson ratio	CTE/ ×10^-6
N	25	180	0.310	16.3
N	1350	176	0.310	15.9
NF91	25	150	0.268	14.8
NF91	1350	148	0.281	14.1
NF73	25	146	0.270	14.2
NF73	1350	143	0.280	13.6
NF55	25	140	0.280	14.1
NF55	1350	132	0.290	13.6
NiO+GDC	25	190	0.292	14.2
NiO+GDC	1350	192	0.300	13.8
GDC	25	260	0.262	13.6
GDC	1350	290	0.264	13.1

图1 N、NF91、NF73和NF55支撑体的XRD图谱

Fig. 1 XRD patterns of N, NF91, NF73 and NF55 support

图2 N、NF91、NF73和NF55支撑SOFC的断面微观形貌

Fig. 2 Cross-sectional micrographs of MS-SOFC with N, NF91, NF73, and NF55 supports

图3 N、NF91、NF73、NF55支撑体与GDC的烧结曲线

Fig. 3 Sintering curves of N, NF91, NF73, NF55 supports and GDC

图4 N、NF91、NF73、NF55支撑体室温下残余应力分布云图

Fig. 4 Residual stress maps of N, NF91, NF73 and NF55 supports at room temperature

图5 N、NF91、NF73、NF55支撑体电池变形位移图

Fig. 5 Deformation and displacement diagrams of MS-SOFC with N, NF91, NF73 and NF55 supports

图6 N、NF91、NF73、NF55支撑体SOFC还原前后的抗弯强度

Fig. 6 Flexure strength of MS-SOFC with N, NF91, NF73 and NF55 supports before and after reduction

图7 Ni、Ni0.9Fe0.1、Ni0.7Fe0.3、Ni0.5Fe0.5支撑SOFC 在650 ℃的I-V-P曲线

Fig. 7 I-V-P curves of SOFC with Ni, Ni0.9Fe0.1, Ni0.7Fe0.3 and Ni0.5Fe0.5 supports

图8 Ni、Ni0.9Fe0.1、Ni0.7Fe0.3、Ni0.5Fe0.5支撑SOFC在650 ℃的交流阻抗谱

Fig. 8 Impedance spectra of SOFC with Ni, Ni0.9Fe0.1, Ni0.7Fe0.3 and Ni0.5Fe0.5 supports

图9 Ni, Ni0.9Fe0.1, Ni0.7Fe0.3, Ni0.5Fe0.5支撑SOFC在650 ℃及400 mA·cm-2稳定性测试

Fig. 9 Stability tests of SOFC with Ni, Ni0.9Fe0.1, Ni0.7Fe0.3 and Ni0.5Fe0.5 supports at 650 ℃ and a constant current density of 400 mA·cm-2

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基于应力分析Ni-Fe合金支撑固体氧化物燃料电池结构稳定性研究

Structural Stability of Ni-Fe Supported Solid Oxide Fuel Cells Based on Stress Analysis

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