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Research Papers

Thermomechanical Properties of Cycled Ceramic/Glass Composite Seals for Solid Oxide Fuel Cells

[+] Author and Article Information
Bodhayan Dev

Department of Mechanical
and Aerospace Engineering,
The Ohio State University,
201 West 19th Avenue,
Columbus, OH 43210
e-mail: Bodhayan05@gmail.com

Mark E. Walter

Department of Mechanical
and Aerospace Engineering,
The Ohio State University,
201 West 19th Avenue,
Columbus, OH 43210
e-mail: Walter.80@osu.edu

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received July 26, 2014; final manuscript received December 15, 2014; published online March 16, 2015. Assoc. Editor: Dr Masashi Mori.

J. Fuel Cell Sci. Technol 12(3), 031009 (Jun 01, 2015) (8 pages) Paper No: FC-14-1088; doi: 10.1115/1.4029876 History: Received July 26, 2014; Revised December 15, 2014; Online March 16, 2015

The present research focuses on a novel ceramic/glass composite seal. These seals first underwent a curing cycle. The cycled seal was then characterized with a laser dilatometer to identify the glass transition, softening temperature, and thermal expansion properties. High temperature ring-on-ring (RoR) experiments were performed to study the effect of glass transition and softening temperatures on mechanical response. X-ray diffraction (XRD) techniques in conjunction with post-test micrographs were used to understand the observed mechanical response. In addition, Weibull statistical analysis performed on cycled seals showed that Weibull modulus had decreased and Weibull characteristics strength had increased with multiple thermal cycles.

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References

Figures

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Fig. 1

SEM image of a green, ceramic/glass composite seal

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Fig. 2

Schematic representation of the cross section of the high temperature RoR setup

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Fig. 3

Variation of thermal expansion behavior of a seal initially cycled once and then subjected to three consecutive dilatometer runs with dwell periods of 5 min, 15 min, and 60 min at 800 °C

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Fig. 4

Identification of different regions in (a) RUN 1, (b) RUN 2, and (c) RUN 3

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Fig. 5

Variation of change in diameter and CTE across different runs

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Fig. 6

Variation in load versus displacement of cycled seals tested at 600 °C

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Fig. 7

Variation in load versus displacement of cycled seals tested at 700 °C

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Fig. 8

Variation in load versus displacement curves of cycled seals tested at 800 °C

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Fig. 9

Variation in surface crack patterns of seals tested at 800 °C after (a) 1 thermal cycle, (b) 5 thermal cycles, and (c) 10 thermal cycles

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Fig. 10

XRD patterns and crystalline phases from seals cured at 800 °C for 1 cycle, 5 cycles, and 10 cycles

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Fig. 11

Cross-sectional SEM and processed images of (a) green seal and seals cured at 800 °C for (b) 1 cycle, (c) 5 cycles, and (d) 10 cycles

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Fig. 12

Variations in Weibull distributions for seals cycled for 1, 5, and 10 thermal cycles and tested at 600, 700 and 800 °C

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