无机材料学报 ›› 2017, Vol. 32 ›› Issue (4): 400-406.DOI: 10.15541/jim20160341
谢佳苗, 王峰会
收稿日期:
2016-05-25
修回日期:
2016-07-11
出版日期:
2017-04-20
网络出版日期:
2017-03-24
基金资助:
XIE Jia-Miao, WANG Feng-Hui
Received:
2016-05-25
Revised:
2016-07-11
Published:
2017-04-20
Online:
2017-03-24
Supported by:
摘要:
为了降低固体氧化物燃料电池在制备和工作过程中产生的热应力, 提高电池的电化学性能, 在电池中引入功能梯度层可以有效减小电池各层之间材料参数的差异, 从而缓解各层之间的热失配应力。本研究将阳极功能层引入燃料电池中, 通过阳极功能层子层数目和非线性梯度成分指数n控制各子层材料属性的变化情况, 研究了燃料电池在800℃下的热应力分布。结果表明: 选取适当的指数n和阳极功能层的分层数目可以明显降低阳极层的最大拉应力和电解质层的最大压应力。
中图分类号:
谢佳苗, 王峰会. 基于热应力分析的固体氧化物燃料电池阳极功能层优化设计[J]. 无机材料学报, 2017, 32(4): 400-406.
XIE Jia-Miao, WANG Feng-Hui. Thermal Stress Analysis of Solid Oxide Fuel Cell with Anode Functional Layer[J]. Journal of Inorganic Materials, 2017, 32(4): 400-406.
T | NiO-YSZ | YSZ | LSM | NiO | |
---|---|---|---|---|---|
E/GPa | 20℃ | 127.3 | 215 | 110 | 110 |
800℃ | 105.5 | 185 | 118 | 90 | |
$\mu $ | 20℃ | 0.33 | 0.308 | 0.36 | 0.34 |
800℃ | 0.33 | 0.313 | 0.36 | 0.34 | |
CTE /×10-6 | 20℃ | 11.77 | 7.6 | 9.8 | 13.0 |
800℃ | 12.42 | 10.5 | 11.8 | 13.0 | |
1400℃ | 12.50 | 10.5 | 11.8 | 13.1 |
表1 电极、电解质等的材料属性[19-21]
Table 1 Material properties of electrodes and electrolyte[19-21]
T | NiO-YSZ | YSZ | LSM | NiO | |
---|---|---|---|---|---|
E/GPa | 20℃ | 127.3 | 215 | 110 | 110 |
800℃ | 105.5 | 185 | 118 | 90 | |
$\mu $ | 20℃ | 0.33 | 0.308 | 0.36 | 0.34 |
800℃ | 0.33 | 0.313 | 0.36 | 0.34 | |
CTE /×10-6 | 20℃ | 11.77 | 7.6 | 9.8 | 13.0 |
800℃ | 12.42 | 10.5 | 11.8 | 13.0 | |
1400℃ | 12.50 | 10.5 | 11.8 | 13.1 |
Layer | AFL | NiO volume fraction | ||
---|---|---|---|---|
n=2 | n=1 | n=0.5 | ||
1 | AFL1 | 20% | 40% | 56% |
2 | AFL1 | 5% | 20% | 40% |
AFL2 | 45% | 60% | 69% | |
3 | AFL1 | 2.5% | 13% | 32% |
AFL2 | 20% | 40% | 56% | |
AFL3 | 55% | 66% | 73% | |
4 | AFL1 | 1.3% | 10% | 27% |
AFL2 | 11.3% | 30% | 49% | |
AFL3 | 31.0% | 50% | 63% | |
AFL4 | 61.0% | 70% | 75% | |
5 | AFL1 | 1% | 8% | 25% |
AFL2 | 7% | 24% | 43% | |
AFL3 | 20% | 40% | 56% | |
AFL4 | 39% | 56% | 66% | |
AFL5 | 65% | 72% | 76% |
表2 各AFL子层中NiO的体积分数
Table 2 Volume fraction of NiO in AFL sublayers
Layer | AFL | NiO volume fraction | ||
---|---|---|---|---|
n=2 | n=1 | n=0.5 | ||
1 | AFL1 | 20% | 40% | 56% |
2 | AFL1 | 5% | 20% | 40% |
AFL2 | 45% | 60% | 69% | |
3 | AFL1 | 2.5% | 13% | 32% |
AFL2 | 20% | 40% | 56% | |
AFL3 | 55% | 66% | 73% | |
4 | AFL1 | 1.3% | 10% | 27% |
AFL2 | 11.3% | 30% | 49% | |
AFL3 | 31.0% | 50% | 63% | |
AFL4 | 61.0% | 70% | 75% | |
5 | AFL1 | 1% | 8% | 25% |
AFL2 | 7% | 24% | 43% | |
AFL3 | 20% | 40% | 56% | |
AFL4 | 39% | 56% | 66% | |
AFL5 | 65% | 72% | 76% |
Presented model | Experimental | Numerical analysis | |
---|---|---|---|
Max. compressive stresses of YSZ /MPa | 633.3 | 670[ | 608.46[ |
Error | — | 5.8% | 3.9% |
表3 YSZ最大压应力结果对比
Table 3 Comparison results of the maximum compressive stresses of YSZ
Presented model | Experimental | Numerical analysis | |
---|---|---|---|
Max. compressive stresses of YSZ /MPa | 633.3 | 670[ | 608.46[ |
Error | — | 5.8% | 3.9% |
图6 阳极层的最大拉应力随AFL划分层数和指数n的变化情况(a)、未设置AFL的阳极应力云图(b)及n=0.5、AFL划分2层的应力云图(c)
Fig. 6 (a) Maximum tensile stresses of anode with the layers of AFL and the exponent n; (b) contour of anode without AFL; (c) contour of two layers of AFL (n=0.5)
图7 YSZ的最大压应力随AFL划分层数和指数n的变化情况(a)、未设置AFL的YSZ应力云图(b)及n=0.5、AFL划分1层的应力云图(c)
Fig. 7 (a) Maximum compressive stresses of YSZ with the layers of AFL and the exponent n, (b) contour of YSZ without the AFL and (c) contour of YSZ with two layers of the AFL (n=0.5)
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