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US 4,631,238 AGranted
Cobalt doped lanthanum chromite material suitable for high temperature use
AssigneeWestinghouse Electric Corp.
InventorRoswell J. Ruka
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AssigneeWestinghouse Electric Corp.
InventorRoswell J. Ruka
Estimating the term…
A high temperature, solid electrolyte electrochemical cell, subject to thermal cycling temperatures of between about 25.degree. C. and about 1200.degree. C., capable of electronic interconnection to at least one other electrochemical cell and capable of operating in an environment containing oxygen and a fuel, is made; where the cell has a first and second electrode with solid electrolyte between them, where an improved interconnect material is applied along a portion of a supporting electrode; where the interconnect is made of a chemically modified lanthanum chromite, containing cobalt as the important additive, which interconnect allows for adjustment of the thermal expansion of the interconnect material to more nearly match that of other cell components, such as zirconia electrolyte, and is stable in oxygen containing atmospheres such as air and in fuel environments.
In a high temperature, solid electrolyte electrochemical cell, subject to thermal cycling temperatures of between about 25.degree. C. and about 1200.degree. C., capable of electronic interconnection to at least one other electrochemical cell and capable of operating in an environment containing oxygen, said cell having two electrodes with solid electrolyte therebetween and an electronically conductive interconnect material disposed over a portion of one electrode, the improvement comprising an interconnect comprising a cobalt doped lanthanum chromite material, where the interconnect is characterized as being nearly impermeable to oxygen, and having a coefficient of thermal expansion that approximates the solid electrolyte in the temperature range of between about 25.degree. C. and about 1200.degree. C.
A high temperature, solid electrolyte electrochemical cell comprising:
A doped lanthanum chromite composition having the chemical formula:
A doped lanthanum chromite composition having the chemical formula:
Dependencies are inferred from the claim text.