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Research Papers

Joining of Metallic Cap and Anode-Supported Tubular Solid Oxide Fuel Cell by Induction Brazing Process

[+] Author and Article Information
Jong-Hee Kim, Dong-Ryul Shin

New Energy Research Department, Korea Institute of Energy Research, 71-2 Jang-dong, Yusong-gu, Daejon 305-343, Korea

Rak-Hyun Song1

New Energy Research Department, Korea Institute of Energy Research, 71-2 Jang-dong, Yusong-gu, Daejon 305-343, Korearhsong@kier.re.kr

1

Corresponding author.

J. Fuel Cell Sci. Technol 6(3), 031012 (May 14, 2009) (6 pages) doi:10.1115/1.3006344 History: Received June 19, 2007; Revised April 02, 2008; Published May 14, 2009

The anode-supported tubular solid oxide fuel cells were fabricated and joined onto the metal cap (SUS430) for current collecting and sealing by using the induction brazing process. Among five filler materials used in the induction brazing, Ni-based BNi2 has shown the lowest gas permeability of 1×106lcm2s1 at a differential pressure of 3 atm measured with He gas. The electrical conductivity of anode support brazed with BNi2 showed 450Scm1 at 750°C and stable value even at the long-term and thermal cycle tests. The brazed anode-supported tubular cell at operating temperature of 750°C produced 210mW/cm2 at 0.7 V. The gas-tightness was confirmed by open circuit voltage (OCV) value similar to theoretical value. The cell showed a stable performance and OCV for 200 h.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematics for the anode-supported tubular cell with metal brazing cap (a) and for electric conductivity measurement of the brazed cell by four-point dc technique (b).

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Figure 2

Gas permeability of the brazed anode-supported tubular cell as a function of differential pressure of He gas

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Figure 3

SEM micrographs of the YSZ/SUS430 interface jointed by induction brazing with Ni-based filler materials. (a) SUS430/BNi2/YSZ interface and (b) SUS430/BNi5/YSZ interface.

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Figure 4

SEM micrographs of the YSZ/SUS430 interface jointed by induction brazing with Ag–Cu based filler materials. (a) SUS430/Palcusil/YSZ interface and (b) SUS430/Nicusil/YSZ interface.

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Figure 6

Electrical conductivity of the brazed anode-supported tubular cell as functions of (a) temperature and (b) holding time

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Figure 7

Electrical conductivity brazed anode-supported tubular cell as functions of number of thermal cycle with heating and cooling rates of 200°C/h (filler material: BNi2)

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Figure 8

Photograph of the brazed anode-supported tubular and flat-tube solid oxide fuel cell

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Figure 9

Cell performances of (a) anode-supported tubular cell with an effective cell area of 11.2 cm2 and (b) anode-supported flat-tube cell with effective electrode area of 32 cm2

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Figure 10

Long-term behavior of the brazed anode-supported flat-tube cell under constant current of 300 mA/cm2 at 750°C

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Figure 5

Microstructure and elemental distributions at the Ni-YSZ cermet/filler material interface. (a) Ni-YSZ/BNi2 interface, (b) Ni-YSZ/BNi5 interface, (c) Ni-YSZ/Nicusil interface, and (d) Ni-YSZ/Palcusil interface.

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