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

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

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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 1000.degree. C. to 1200.degree. 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.

Inventors:

Singh, Prabhakar ^[1]; Ruka, Roswell J. ^[2]

(Export, PA)
(Pittsburgh, PA)

Issue Date:: 1995-01-01

OSTI Identifier:: 869749

Assignee:: Westinghouse Electric Corporation (Pittsburgh, PA) NETL

Patent Number(s):: US 5389456

Contract Number:: FC21-91MC28055

Research Org:: Westinghouse Electric Corporation (Pittsburgh, PA)

Country of Publication:: United States

Language:: English

Subject:: method; closing; pores; thermally; sprayed; doped; lanthanum; chromite; interconnection; layer; dense; substantially; gas-tight; electrically; conductive; formed; air; electrode; structure; electrochemical; cell; providing; surface; forming; selected; portion; lacro; particles; element; elements; sr; mg; mixtures; thermal; spraying; plasma; flame; depositing; mixture; cao; heating; coated; deposit; 1000; degree; 1200; close; result; highly; material; bonded; solid; electrolyte; applied; nonselected; fuel; form; example; generation; electrical; power; substantially gas-tight; material bonded; elements selected; interconnection layer; electrolyte layer; electrode structure; air electrode; electrical power; electrochemical cell; electrically conductive; solid electrolyte; fuel electrode; electrode surface; highly doped; interconnection material; doped lanthanum; conductive interconnection; selected portion; lanthanum chromite; doped lacro; surface deposit; thermally sprayed; thermal spraying; thermal spray; substantially close; conductive interconnect; /429/29/427/

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