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Research Papers

Evaluation and Application of a Novel BaO–CaO–SiO2–CoO–B2O3 Based Glass-Ceramic Sealing Material for Solid Oxide Fuel Cells

[+] Author and Article Information
Zhaonan Li, Jiajun Yang, Jian Pu

School of Materials Science and Engineering,
State Key Laboratory of Material Processing
and Die and Mould Technology,
Huazhong University of Science and Technology,
Wuhan 430074, Hubei, China

Dong Yan

School of Materials Science and Engineering,
State Key Laboratory of Material Processing
and Die and Mould Technology,
Huazhong University of Science and Technology,
Wuhan 430074, Hubei, China
e-mail: yand@hust.edu.cn

Ping Feng

College of Materials and Chemical Engineering,
Key Laboratory of Inorganic Nonmetallic
Crystalline and Energy Conversion Materials,
China Three Gorges University,
Yichang 443002, Hubei, China

1Z. Li and J. Yang contributed equally to this work.

2Corresponding author.

Manuscript received February 27, 2017; final manuscript received June 27, 2017; published online October 4, 2017. Assoc. Editor: San Ping Jiang.

J. Electrochem. En. Conv. Stor. 14(4), 041006 (Oct 04, 2017) (7 pages) Paper No: JEECS-17-1026; doi: 10.1115/1.4037648 History: Received February 27, 2017; Revised June 27, 2017

Sealant is used in a solid oxide fuel cell (SOFC) stack to separate fuel and oxygen from burning with each other throughout the stack's lifetime cycle. Various sealing materials have been developed and the glass sealant shows quite a potential for its low leaking rate. However, glass sealants usually suffer from fractures during thermal cycle because of their low-temperature brittleness and mismatched coefficient of thermal expansion. Recently, we have developed a novel glass-based sealant consisting of BaO–CaO–SiO2–CoO and a small amount of Al2O3 powder which is used to adjust the coefficient of thermal expansion (CTE) and reinforce its mechanical performance. The sealant exhibited a good performance with the leaking rates less than 0.04 sccm cm−1 under compressive load of 0.17 MPa at 750 °C and showed stable leak rates over several thermal cycles. The well bonded interfaces and chemical compatibility have been identified by microstructure analysis of the seals. The sealant also demonstrated its applicability in a one-cell stack test.

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Figures

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Fig. 1

Scanning electron microscope (SEM) micrographs of (a) BCSC glass, (b) Al2O3 powders, and (c) particle size distribution used for fabrication of glass-based sealant

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Fig. 2

XRD patterns of (a) glass and (b) Al2O3 powders used for fabrication of glass-based sealant

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Fig. 3

Thermal expansion coefficient curve of glass with different Al2O3 contents

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Fig. 4

Morphology of the die press samples after being heated to 750 °C for 2 h

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Fig. 5

The leakage rate of tape-cast glass seals with various glass contents at 750 °C and 0.17 MPa compressive load

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Fig. 6

SEM microstructure of (a) BCSC-A10, (b) BCSC-A30, and (c) BCSC-A50 sealants after leak test at 750 °C and 0.17 MPa compressive load

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Fig. 7

Leakage rates of BCSC-A10 under thermal cycling

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Fig. 8

The XRD pattern of BCSC-A10 seal after 25 times thermal cycles under a compressive load of 0.17 MPa between 400 °C and 750 °C

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Fig. 9

SEM microstructure and energy-dispersive X-ray spectroscopy line scan of interfaces of (a) and (c) anode-BCSC-Al2O3 seals and (b) and (d) interconnect-BCSC-A10

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Fig. 10

The bonding strength between interconnect/anode and BCSC-A10

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Fig. 11

Power density curve of the one-cell stack and its 90 h constant current performance during operation

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