期刊
JOURNAL OF POWER SOURCES
卷 190, 期 2, 页码 402-407出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2009.01.042
关键词
Glass-ceramic; Fuel cell; Sealant; Hydrogen; Crofer22APU
资金
- EU Network of Excellence [NMP3-CT-2004-502243]
- MULTISS: Design and in-house development of SOFC stacks for dealing with multiple fuels (Regione Piemonte project, Italy).
This work describes the performance and testing of a glass-ceramic sealant used to join the ceramic electrolyte (anode-supported-electrolyte (ASE)) to the metallic interconnect (Crofer22APU) in planar SOFC stacks. The designed glass-ceramic sealant is a barium and boron free silica-based glass, which crystallizes by means of the heat-treatment after being deposited on substrates by the slurry technique. Joined ASE/glass-ceramic seal/Crofer22APU samples were tested for 500 h in H-2-3H(2)O atmosphere at the fuel cell operating temperature of 800 degrees C. Moreover, the joined ASE/glass-ceramic seal/Crofer22APU samples were submitted to three thermal cycles each of 120 h duration, in order to evaluate the thermomechanical stability of the sealant. The microstructures and elemental distribution at Crofer22APU/glass-ceramic and ASE/glass-ceramic interfaces were investigated. SEM micrograph observations of joined samples that underwent cyclic thermal tests and exposure for 500 h in H-2-3H(2)O atmosphere showed that the adhesion between the glass-ceramic and Crofer22APU at either interface was very good and no microstructural changes were detected at the interfacial boundaries. The study showed that the use of the glass-ceramic was successful in preventing strong adverse corrosion effects at the Crofer22APU/glass-ceramic sealant interface. (C) 2009 Elsevier B.V. All rights reserved.
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