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Title: Method and closing pores in a thermally sprayed doped lanthanum chromite interconnection layer

A dense, substantially gas-tight electrically conductive interconnection layer is formed on an air electrode structure of an electrochemical cell by (A) providing an air electrode surface; (B) forming on a selected portion of the electrode surface, a layer of doped LaCrO{sub 3} particles doped with an element or elements selected from Ca, Sr, Ba, Mg, Co, Ni, Al and mixtures thereof by thermal spraying doped LaCrO{sub 3} particles, either by plasma arc spraying or flame spraying; (C) depositing a mixture of CaO and Cr{sub 2}O{sub 3} on the surface of the thermally sprayed layer; and (D) heating the doped LaCrO{sub 3} layer coated with CaO and Cr{sub 2}O{sub 3} surface deposit at from about 1,000 C to 1,200 C to substantially close the pores, at least at a surface, of the thermally sprayed doped LaCrO{sub 3} layer. The result is a dense, substantially gas-tight, highly doped, electrically conductive interconnection material bonded to the electrode surface. A solid electrolyte layer can be applied to the nonselected portion of the air electrode. A fuel electrode can be applied to the solid electrolyte, to form an electrochemical cell, for example for generation of electrical power. 5 figs.
Inventors:
;
Issue Date:
OSTI Identifier:
27709
Assignee:
Westinghouse Electric Corp., Pittsburgh, PA (United States) PTO; SCA: 300503; PA: EDB-95:056984; SN: 95001354473
Patent Number(s):
US 5,389,456/A/
Application Number:
PAN: 8-195,935
Contract Number:
FC21-91MC28055
Resource Relation:
Other Information: PBD: 14 Feb 1995
Research Org:
Westinghouse Electric Corporation
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; SOLID ELECTROLYTE FUEL CELLS; ELECTRODES; FABRICATION; COATINGS; LANTHANUM COMPOUNDS; CHROMIUM OXIDES; CALCIUM; STRONTIUM; BARIUM; MAGNESIUM; COBALT; NICKEL; ALUMINIUM; DOPED MATERIALS; SPRAY COATING; HEAT TREATMENTS; CALCIUM OXIDES; ELECTRIC CONDUCTIVITY

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