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Title: Method of forming a leak proof plasma sprayed interconnection layer on an electrode of an electrochemical cell

Abstract

A dense, substantially gas-tight, electrically conductive interconnection layer is formed on an electrode structure of an electrochemical cell by: (A) providing an electrode structure; (B) forming on a selected portion of the electrode surface, an interconnection layer having the general formula La{sub 1{minus}x}M{sub x}Cr{sub 1{minus}y}N{sub y}O{sub 3}, where M is a dopant selected from the group of Ca, Sr, Ba, and mixtures thereof, and where N is a dopant selected from the group of Mg, Co, Ni, Al, and mixtures thereof, and where x and y are each independently about 0.075--0.25, by thermally spraying, preferably plasma arc spraying, a flux added interconnection spray powder, preferably agglomerated, the flux added powder comprising flux particles, preferably including dopant, preferably (CaO){sub 12}(Al{sub 2}O{sub 3}){sub 7} flux particles including Ca and Al dopant, and LaCrO{sub 3} interconnection particles, preferably undoped LaCrO{sub 3}, to form a dense and substantially gas-tight interconnection material bonded to the electrode structure by a single plasma spraying step; and (C) heat treating the interconnection layer at from about 1,200 to 1,350 C to further densify and heal the micro-cracks and macro-cracks of the thermally sprayed interconnection layer. The result is a substantially gas-tight, highly doped, electrically conductive interconnection material bondedmore » to the electrode structure. The electrode structure can be an air electrode, and a solid electrolyte layer can be applied to the unselected portion of the air electrode, and further a fuel electrode can be applied to the solid electrolyte, to form an electrochemical cell for generation of electrical power. 4 figs.« less

Inventors:
;
Issue Date:
Research Org.:
Westinghouse Electric Corporation
OSTI Identifier:
27707
Patent Number(s):
5,391,440
Application Number:
PAN: 8-195,335
Assignee:
Westinghouse Electric Corp., Pittsburgh, PA (United States)
DOE Contract Number:  
FC21-91MC28055
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 21 Feb 1995
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; SOLID ELECTROLYTE FUEL CELLS; ELECTRODES; FABRICATION; COATINGS; PLASMA ARC SPRAYING; LANTHANUM OXIDES; CHROMIUM OXIDES; DOPED MATERIALS; CALCIUM OXIDES; STRONTIUM OXIDES; BARIUM OXIDES; MAGNESIUM OXIDES; COBALT OXIDES; NICKEL OXIDES; ALUMINIUM OXIDES; LANTHANUM COMPOUNDS; HEAT TREATMENTS; ELECTRIC CONDUCTIVITY

Citation Formats

Kuo, L J.H., and Vora, S D. Method of forming a leak proof plasma sprayed interconnection layer on an electrode of an electrochemical cell. United States: N. p., 1995. Web.
Kuo, L J.H., & Vora, S D. Method of forming a leak proof plasma sprayed interconnection layer on an electrode of an electrochemical cell. United States.
Kuo, L J.H., and Vora, S D. Tue . "Method of forming a leak proof plasma sprayed interconnection layer on an electrode of an electrochemical cell". United States.
@article{osti_27707,
title = {Method of forming a leak proof plasma sprayed interconnection layer on an electrode of an electrochemical cell},
author = {Kuo, L J.H. and Vora, S D},
abstractNote = {A dense, substantially gas-tight, electrically conductive interconnection layer is formed on an electrode structure of an electrochemical cell by: (A) providing an electrode structure; (B) forming on a selected portion of the electrode surface, an interconnection layer having the general formula La{sub 1{minus}x}M{sub x}Cr{sub 1{minus}y}N{sub y}O{sub 3}, where M is a dopant selected from the group of Ca, Sr, Ba, and mixtures thereof, and where N is a dopant selected from the group of Mg, Co, Ni, Al, and mixtures thereof, and where x and y are each independently about 0.075--0.25, by thermally spraying, preferably plasma arc spraying, a flux added interconnection spray powder, preferably agglomerated, the flux added powder comprising flux particles, preferably including dopant, preferably (CaO){sub 12}(Al{sub 2}O{sub 3}){sub 7} flux particles including Ca and Al dopant, and LaCrO{sub 3} interconnection particles, preferably undoped LaCrO{sub 3}, to form a dense and substantially gas-tight interconnection material bonded to the electrode structure by a single plasma spraying step; and (C) heat treating the interconnection layer at from about 1,200 to 1,350 C to further densify and heal the micro-cracks and macro-cracks of the thermally sprayed interconnection layer. The result is a substantially gas-tight, highly doped, electrically conductive interconnection material bonded to the electrode structure. The electrode structure can be an air electrode, and a solid electrolyte layer can be applied to the unselected portion of the air electrode, and further a fuel electrode can be applied to the solid electrolyte, to form an electrochemical cell for generation of electrical power. 4 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {2}
}