EP0467692A2
Expired / Lapsed
EP
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A method of forming an electronically conductive composite layer on a substrate in a device containing solid electrolyte
Assignee: Westinghouse Electric Corp
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Filing: 1991-07-18
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Granted: —
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Expires: 2011-07-18
Abstract
Abstract An electrochemical device, containing a solid oxide electrolyte material and an electrically conductive composite layer, has the composite layer attached by: (A) applying a layer of LaCrO₃ or YCrO₃ particles (32), on a portion of a porous ceramic substrate (30), (B) heating to sinter bond the particles to the substrate, (C) depositing a dense filler structure (34) between the doped particles (32), (D) shaving off the top of the particles, and (E) applying an electronically conductive layer over the particles (32) as a contact.
Inventors
- 👤 Arnold Otto Isenberg
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 19:26
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4075; H; H01; H01M; H01M8/00; H01M8/10; H01M8/12; H01M8/1213; B; B01; B01D; B01D67/00; B01D67/0039; B01D67/0046; B01D67/0072; B01D71/00; B01D71/02; H01B; H01B1/00; H01B1/06; H01B1/08; H01M4/00; H01M4/86; H01M4/90; H01M4/9016; H01M4/9025; H01M4/9033; H01M8/002; H01M8/004; H01M8/1231; H01M8/124; H01M8/1246; H01M8/1253; B01D2325/00; B01D2325/04; B01D2325/26; H01M2008/1293; H01M2300/00; H01M2300/0017; H01M2300/0065; H01M2300/0068; H01M2300/0071; H01M2300/0074; H01M2300/0077; H01M2300/0088; H01M2300/0094; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
164 words
A method of forming a dense, high temperature electronically conductive composite layer on an electrode structure, characterized by the steps of: (A) applying a thin layer of dense particles selected from the group consisting of doped LaCrO₃ and doped YCrO₃ where the dopant is an element selected from the group consisting of Mg, Ca, Sr, Ba, Ce, Co, Ni, and mixtures thereof, on a portion of a first surface of a porous electrode structure, (B) heating the particles to sinter bond them to the electrode, (C) electrochemical vapor depositing a dense skeletal structure comprising stabilized ZrO₂, between and around the doped particles, where the particles get embedded into the stabilized ZrO₂ structure as it grows thicker with time, (D) removing any stabilized ZrO₂ that was deposited on top of the embedded particles, to expose the doped particles, and (E) applying a high temperature electronically conductive coating over at least the doped particles, to provide an electronically conductive interconnection layer on the porous electrode structure.
Claim 2
Dependent Claim
103 words
The method of claim 1, characterized in that the electrochemical vapor deposition step comprises heating the electrode structure, and applying metal halide vapor comprising zirconium halide and yttrium halide to the outer first surface of the porous electrode structure and applying a source of oxygen to an inner second, opposite surface of the porous electrode structure, so that oxygen contacts the metal halide vapor at said first surface of the electrode to cause a reaction of the oxygen with the metal halide vapor and cause a dense, zirconiumyttrium, oxide structure to grow from the first electrode surface, between and around the doped particles.
Claim 3
Dependent Claim
25 words
The method of claim 1, characterized in that the electrode structure is a porous, tubular, solid oxide fuel cell air electrode structure comprising doped LaMnO₃.
Claim 4
Dependent Claim
35 words
The method of claim 1, characterized,in that the doped LaCrO₃ particles cover 5% to 99% of the surface area on the portion of the surface where they are deposited, and where the particles are close-packed.
Claim 5
Dependent Claim
44 words
The method of claim 1, characterized in that the doped LaCrO₃ particles have diameters from 75 micrometers to 1,000 micrometers, are applied as a closely packed single particle layer, and the particles remain intact within the interconnection layer in discrete form after step (B).
Claim 6
Dependent Claim
48 words
The method of claim 1, characterized in that the doped LaCrO₃ particles have diameters from 400 micrometers to 600 micrometers, the electrode structure is an air electrode, the particles are doped LaCrO₃ particles, and the layer of doped LaCrO₃ particles is applied in step (A) by tape application.
Claim 7
Dependent Claim
25 words
The method of claim 1, characterized in that a cermet fuel electrode is applied over the electrolyte, to provide an electrochemical solid oxide electrolyte cell.
Claim 8
Dependent Claim
47 words
An oxygen semi-permeable membrane, characterized in that electronically conducting particles selected from the group consisting of doped LaCrO₃, doped YCrO₃, doped LaMnO₃ particles and mixtures thereof, are embedded in stabilized ZrO₂, and the top particle surfaces are exposed to the atmosphere on both sides of the membrane.
Claim 9
Dependent Claim
21 words
A membrane according to claim 8, characterized in that such a membrane is placed on a porous stabilized ZrO₂ support tube.
Claim 10
Dependent Claim
33 words
A membrane according to claim 8, characterized in that the membrane is placed on a conducting oxide porous support tube selected from the group consisting of doped LaMnO₃, doped LaCrO₃, and mixtures thereof.
Claim 11
Dependent Claim
27 words
A membrane according to claim 8, characterized in that the membrane is coated on both sides with a thin porous layer of oxides of the Perovskite family.
References Cited (Backward Citations)
No citation records indexed.
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