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Sub-Area of Interest 1A: Seals - Rigid, High-StrengthSealing Concepts

Published on AidPage by IDILOGIC on Jun 24, 2005
Administered by:

Department of Energy, All Departmental Locations, All DOE Federal Offices
(see all US Federal Agencies)

Explore all postings for this grant program:
  • Original Grant - Nov 10, 2004
Applications Due:

Jan 18, 2005

total funding: Not Available
max award: none
min award: none
cost sharing, matching: Yes
number of awards: Not Available
type of funding: Cooperative Agreement
Description:

NOTE: Please read the Master Funding OpportunityAnnouncement (attached below)for complete details on evaluation criteria and application preparationinstructions.SUB-AREA OF INTEREST 1A: Seals ? Rigid, High-Strength Sealing ConceptsApplications are sought to research and develop rigid, high-strength sealmaterials and/or design concepts to address solid oxide fuel cell (SOFC)sealing needs. Proposed approaches should combine analysis andexperimentationto establish and evaluate the practical performance limits of the sealingconcept.Of particular interest are rigid sealing concepts with improved thermal,chemical and mechanical stability under typical SOFC operating conditions,perhaps achieved through the identification and/or development of suitableglass, glass-ceramic, cermet, braze or other novel materials. In the caseofglasses and glass-ceramics, higher glass transition temperatures (perhapsashigh as the cathode processing temperature) or reinforcement may be aviableoption.The precursor material may be put down as a paste, tape or by other meansduring assembly. The assembly to be sealed may then be taken to someprocessing temperature at or above normal stack operating temperature.Uponcooling, the seal would become rigid ? ideally, this transition would occurwell above the cell operating temperature to ensure chemical and phasestability of the seal material. Under this scenario, if the coefficient ofthermal expansion (CTE) of the interconnect is greater than that of thecell, astate of biaxial compressive stress will be imposed within the cell uponcool-down, decreasing the likelihood of tensile stress-induced catastrophiccell fracture and increasing the safe operating envelope with respect toallowable in-plane temperature gradients as well as stack heat-up andcool-downrates. The bulk seal, as well as the seal interfaces with adjacent cellsandinterconnects, must withstand the shear stresses encountered in thisscenario.Desired characteristics of the seal material(s)/seal system:?Aggregate manufactured cost for a 5kW SECA stack (60 -120 seals) on theorderof $50 or less.?Accommodate as-fabricated cell and interconnect dimensional variations.?Service life of more than 40,000 hours and hundreds of thermal cycles forstationary systems.?Electrically insulating.?Chemically and physically stable in a high-temperature reactive SOFCenvironment.?Chemically and mechanically compatible with the materials (e.g., Ni/YSZcermetanode and ferritic stainless steel interconnect) of the particular SOFCsystemdesign.?Fuel leakage should not exceed 1% of the fuel flowrate (uniformlydistributed,0.7 kPa differential pressure across the seal) for a cell with nominaldimensions of 15cm x 15cm after exposing the SOFC stack to ten or morethermalcycles.Cost, manufacturability and reliability are critical factors in meetingSECAProgram goals.

Who can apply:

Unrestricted

Eligible functional categories:
Funding Sources:

Fossil Energy Research and Development

More Information:

Click here to view the Opportunity

If you have problems accessing the full announcement, please contact: using thislink
If you have problems accessing the full announcement, please contact: Raymond Johnson

Address Info:

U.S. Department of Energy, National Energy TechnologyLaboratory, 3610 Collins Ferry Road (MS-I07) P.O. Box 880 Morgantown, WV26507-0880

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