Sealant research for SOFC

Conference · Wed Jan 01 04:00:00 EST 1992

OSTI ID:7001052

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: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC21-89MC26006
• OSTI ID: 7001052
• Report Number(s): DOE/MC/26006-92/C0064; CONF-920748--19; ON: DE92040254
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
300503* -- Fuel Cells-- Materials
Components
& Auxiliaries
BONDING
DATA
DEMONSTRATION PROGRAMS
DESIGN
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
EXPERIMENTAL DATA
FABRICATION
FUEL CELLS
INFORMATION
JOINING
NUMERICAL DATA
PERFORMANCE TESTING
SEALS
SOLID ELECTROLYTE FUEL CELLS
TESTING