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Research Papers

Shrinkage Control of the Sealing Layer for the Cube-Type Solid Oxide Fuel Cell Bundle

[+] Author and Article Information
S. Sakuragi, Y. Fujishiro, M. Awano

 National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, Japan

Y. Funahashi

 Fine Ceramics Research Association (FCRA), Nagoya 463-8561, Japan

T. Suzuki

 National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, Japantoshio.suzuki@aist.go.jp

J. Fuel Cell Sci. Technol 7(2), 021021 (Jan 20, 2010) (4 pages) doi:10.1115/1.3182728 History: Received June 02, 2008; Revised July 08, 2008; Published January 20, 2010; Online January 20, 2010

Currently, microtubular solid oxide fuel cells (SOFC) bundles are under development, which consist of microtubular SOFCs (diameter=0.82mm) and porous cathode matrix where the SOFCs are integrated. In this study, a new fabrication process of the sealing layer for the microtubular SOFC bundles was examined using MgO-magnesium boro-silicate glass composites. A sheet and paste of these composites were prepared, and the microstructure and shrinkage behavior of the composite glass layers were investigated to minimize the deformation of the layer during fabrication process. The results indicated that using 100% glass sheet with the composite glass pastes appeared to be effective in reducing the shrinkage of the glass layer. In addition, the effect of sheet thickness on the shrinkage behavior was investigated and showed that the shrinkage ratio reduced as the sheet thickness decreased, and the shrinkage of about 0.2% was achieved at the sheet thickness of about 200μm without defects or shape deformations. Thus, this fabrication method turned out to be effective for constructing a sealing layer for the microtubular SOFC bundles.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Fabrication procedure of the gas seal layer for a microtubular SOFC bundle

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Figure 2

SEM images of the glass MgO composites (paste) prepared on porous LSCF: (a) a composite with 10 vol % MgO additive and (b) a composite with 15 vol % MgO additive

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Figure 3

Shrinkage ratio of the glass and the glass MgO composite sheet

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Figure 4

Shrinkage ratio of the composite sheet with various glass composite pastes prepared on the porous LSCF

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Figure 5

Sheet shrinkage as a function of sheet thickness

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Figure 6

The cross section image of the glass seal layer prepared on the porous LSCF

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Figure 7

Micro-SOFC bundle with the glass seal layer

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