Sealant research for SOFC

Technical Report · Tue Sep 01 04:00:00 EDT 1992

DOI:https://doi.org/10.2172/10179824· OSTI ID:10179824

Gibson, R A; Minh, N Q

During the past year, AiResearch effort has focused on development of the requisite technology for fabricating and demonstrating multicell stack operation. This effort has generated parallel tasks as follows: (a) Fabrication of single-cell building blocks comprising anode/electrolyte/cathode (A/E/C) trilayers cofired with top and bottom corrugated electrodes and with or without cofired top and bottom electrode plates. These building blocks are called single-cell stacks (with electrode plates) and single-cell modules, respectively (see Figure 3). Design changes suggested by a comprehensive stack stress model (Figure 4) have reduced fracturing in the building blocks (Figure 5) and improved performance (Figure 6). (b) Development of bonding technology for forming the building blocks into multicell stacks. Because of delays in development of an interconnect technology suitable for simultaneously thermally processing all components of multicell MSOFC stacks, an alternative, two-step process has also been under development. In this process the building blocks and interconnects are fired separately, bonded, and fired again. The ``second step`` bonding technology has continually improved (see Figure 7). Development of multicell stacks fabricated from the bonded building blocks. Stacks have shown continually improving performance (see Figure 8). A two-cell stack has recently been tested for over 500 hours without performance degradation.

• Research Organization: Allied-Signal Aerospace Co., Torrance, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC21-89MC26006
• OSTI ID: 10179824
• Report Number(s): DOE/MC/26006--92/C0064; CONF-920748--19; ON: DE92040254
• Country of Publication: United States
• Language: English

Related Subjects

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BONDING
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PERFORMANCE TESTING
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SOLID ELECTROLYTE FUEL CELLS