Compliant sealants for solid oxide fuel cells and other ceramics

Title: Compliant sealants for solid oxide fuel cells and other ceramics

Full Record
Similar

A glass or glass-ceramic sealant is described for a SOFC having a coefficient of thermal expansion in the range of from about 8 to about 13{times}10{sup {minus}6}/C and a viscosity of at least 10{sup 3}Pa-s at cell operating temperature. The sealant has a composition of SrO present in the range of from about 5 to about 60 mole percent, La{sub 2}O{sub 3} present in the range of from 0 to about 45 mole percent, Al{sub 2}O{sub 3} present in the range from 0 to about 15 mole percent, B{sub 2}O{sub 3} present in the range of from about 15 mole percent to about 80 mole percent, and SiO{sub 2} present in the range of from 0 to about 40 mole percent, wherein the material is a viscous fluid at cell operating temperatures of from about 600 C to about 1000 C. The sealant may also be compounds of CaO present in the range of from 0 to about 35 mole percent, Al{sub 2}O{sub 3} present in the range from 0 to about 15 mole percent, B{sub 2}O{sub 3} present in the range of from about 35 mole percent to about 85 mole percent, and SiO{sub 2} present in the rangemore »

Inventors:: Bloom, I.D.; Ley, K.L.

Issue Date:: 1995-09-26

OSTI Identifier:: 106697

Assignee:: Univ. of Chicago, IL (United States) PTO; SCA: 300503; PA: EDB-95:135533; SN: 95001461637

Patent Number(s):: US 5,453,331/A/

Application Number:: PAN: 8-289,751

Contract Number:: W-31109-ENG-38

Resource Relation:: Other Information: PBD: 26 Sep 1995

Research Org:: Univ. of Chicago, IL (United States)

Country of Publication:: United States

Language:: English

Subject:: 30 DIRECT ENERGY CONVERSION; SOLID ELECTROLYTE FUEL CELLS; SEALS; DESIGN; CHEMICAL COMPOSITION; STRONTIUM OXIDES; LANTHANUM OXIDES; ALUMINIUM OXIDES; BORON OXIDES; SILICON OXIDES; CALCIUM OXIDES; MOLTEN SALTS

Full Text
Patents / Patent Applications
Search for the full text at the U.S. Patent and Trademark Office

Similar records in DOepatents and OSTI.GOV collections:

Compliant sealants for solid oxide fuel cells and other ceramics

Patent Bloom, Ira D. ; Ley, Kevin L.

A glass or glass-ceramic sealant for a SOFC having a coefficient of thermal expansion in the range of from about 8 to about 13.times.10.sup.-6 /.degree.C. and a viscosity of at least 10.sup.3 Pa-s at cell operating temperature. The sealant has a composition of SrO present in the range of from about 5 to about 60 mole percent, La.sub.2 O.sub.3 present in the range of from 0 to about 45 mole percent, Al.sub.2 O.sub.3 present in the range from 0 to about 15 mole percent, B.sub.2 O.sub.3 present in the range of from about 15 mole percent to about 80 molemore »« less
Full Text Available January 1995
Sealants for Solid Oxide Fuel Cells

Conference - in OSTI.gov collection Kueper, T.W. ; Bloom, I.D. ; Krumpelt, M.

Basic requirements for a sealant are good bonding to the materials of interest, chemical stability in the operating environment, and low gas permeability. For high-temperature operation as in Solid Oxide Fuel Cells (SOFCs), the sealant must also have a thermal expansion which is reasonably close to that of the other materials involved and must have some compliance, or softness, to allow for some mismatch between the components to be joined. In this paper, we discuss a family of glass-ceramic materials with mechanical, chemical, and electrical properties that are suitable for these demanding high-temperature applications.
Full Text Available February 1996
Glass-ceramic sealants for solid oxide fuel cells: Part I. Physical properties

Journal Article - in OSTI.gov collection Ley, K.L. ; Krumpelt, M. ; Kumar, R. ; Meiser, J.H. ; Bloom, I.

A family of sealant materials has been developed for use in the solid oxide fuel cell (SOFC) and in other applications in the temperature range of 800{endash}1000{degree}C. These materials are based on glasses and glass-ceramics in the SrO{endash}La{sub 2}O{sub 3}{endash}Al{sub 2}O{sub 3}{endash}B{sub 2}O{sub 3}{endash}SiO{sub 2} system. The coefficients of thermal expansion (CTE) for these materials are in the range of 8{endash}13{times}10{sup {minus}6}/{degree}C, a good match with those of the SOFC components. These sealant materials bond well with the ceramics of the SOFC and, more importantly, form bonds that can be thermally cycled without failure. At the fuel cell operating temperature,more »« less
June 1996
Supporting electrodes for solid oxide fuel cells and other electrochemical devices

Patent Sprenkle, Vincent L ; Canfield, Nathan L ; Meinhardt, Kerry ; Stevenson, Jeffry W

An electrode supported electrolyte membrane includes an electrode layer 630 facing an electrolyte layer 620. The opposing side of the electrode layer 630 includes a backing layer 640 of a material with a thermal expansion coefficient approximately equal to the thermal expansion coefficient of the electrolyte layer 620. The backing layer 640 is in a two dimensional pattern that covers only a portion of the electrolyte layer 630. An electrochemical cell such as a SOFC is formed by providing a cathode layer 610 on an opposing side of the electrolyte layer 620.
Full Text Available April 2008
FINITE ELEMENT ANALYSIS OF THE BONDED COMPLIANT SEAL DESIGN – A NEW SEALING CONCEPT FOR USE IN PLANAR SOLID OXIDE FUEL CELLS

Conference - in OSTI.gov collection Koeppel, Brian J. ; Weil, K. Scott

A key issue in developing commercially viable planar solid oxide fuel cell stacks is appropriate seal design. We are currently developing an alternative approach to rigid and compressive seal designs that conceptually combines advantages of both techiques, including hermeticity, mechanical integrity, and minimization of interfacial stresses in either of the joint substrate materials, particulary the ceramic. The new seal relies on a plastically deformable metal seal; one that offers a quasi-dynamic mechanical response in that it is adherent to both sealing surfaces, i.e. non-sliding, but readily yields or deforms under thermally generated stresses, thereby mitigating the development of stresses inmore »« less
August 2005, Narottam P. Bansal; The American Ceramic Society, Westerville, OH, United States(US).