Composite sealant materials based on reacting fillers for solid oxide fuel cells
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United States of America Patent
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Apr 1, 2003
Grant Date -
N/A
app pub date -
Nov 7, 2000
filing date -
Nov 7, 2000
priority date (Note) -
Expired
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Abstract
A composite sealant for in-situ sealing a fuel cell stack is provided. A paste of the sealant mixture is initially formed by mixing a glass precursor powder and a reacting filler material. The sealant mixture paste is applied to selected sealing locations of the fuel cell stack. The sealant mixture paste is then transformed into a composite sealant material to seal the selected sealing locations by heat treatment in air to about 900.degree. C. The composite sealant material comprises a glass matrix phase and a reinforcing phase including a plurality of interlocked elongated single crystal grains. The reacting fillers modify the CTE and significantly improve the gap filling capacity of the composite sealant material and provide superior pressure containment capability at elevated temperatures.
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