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

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 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.degree. C. to about 1000.degree. 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 range of from 0 to about 30 mole percent.
Inventors:
 [1];  [1]
  1. (Bolingbrook, IL)
Issue Date:
OSTI Identifier:
870082
Assignee:
University of Chicago (Chicago, IL) ANL
Patent Number(s):
US 5453331
Contract Number:
W-31109-ENG-38
Research Org:
Argonne National Laboratory (ANL), Argonne, IL
Country of Publication:
United States
Language:
English
Subject:
compliant; sealants; solid; oxide; fuel; cells; ceramics; glass; glass-ceramic; sealant; sofc; coefficient; thermal; expansion; range; 13; times; 10; -6; degree; viscosity; pa-s; cell; operating; temperature; composition; sro; 60; mole; percent; 45; 15; 80; sio; 40; material; viscous; fluid; temperatures; 600; 1000; compounds; cao; 35; 85; 30; fuel cell; thermal expansion; fuel cells; oxide fuel; solid oxide; mole percent; operating temperature; operating temperatures; cell operating; compliant seal; ceramic seal; /429/