This patented glass technology possess high resistivity and holds up well in both reducing and oxidizing environments. Additionally, this technology can be tailored to yield a wide range of thermal expansions. Sealing temperature may also be adjusted over a range of 750-950° C. The seal material has exhibited very strong bonding to both zirconia and ceria-based ceramic with little or no interaction after thousands of hours of operation at elevated temperature. Due to the high amount of crystalline material in the seal, it is resistant to creep, which is necessary for long-term operation at temperature. One composition has operated in a SOFC stack in excess of 4,000 hours.
The seal is a blend of MAO-MBOy-SiO2 that substantially matches a coefficient of thermal expansion of the solid electrolyte. A series of glass ceramics in the MAO-MBOy-SiO2 system can be used to join or seal both tubular and planar ceramic solid oxide fuel cells, oxygen generators, electrolyzers, and membrane reactors for the production of syngas, commodity chemicals and other products.
Potential Industry Applications:
|6,430,966||08/13/2002||Glass-ceramic material and method of making|
|6,532,769||03/18/2003||Glass-ceramic joint and method of joining|