Ceramic substrate for electrochemical element, manufacturing method therefore, fuel cell, and fuel cell stack

Patent metadata

Field	Value
Publication number	US-9722259-B2
Application number	US-201614991109-A
Country	US
Kind code	B2
Filing date	Jan 8, 2016
Priority date	Aug 21, 2013
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

A ceramic substrate for an electrochemical element that includes a ceramic layer and a high-thermal-expansion-coefficient material layer that is laminated on the surface of the ceramic layer. The high-thermal-expansion-coefficient material layer has a higher coefficient of thermal expansion than the ceramic layer, and applies compressive stress to the ceramic layer.

First claim

The invention claimed is:

1. A ceramic substrate for an electrochemical element, the ceramic substrate comprising:
a ceramic layer;
a high-thermal-expansion-coefficient material layer on a surface of the ceramic layer, the high-thermal-expansion-coefficient material layer comprises a ceramic material containing at least one of a lanthanum-manganite material, a lanthanum-cobaltite material, and a gadolinium doped ceria material as a main component thereof, having a higher coefficient of thermal expansion than the ceramic layer and applying compressive stress to the ceramic layer; and
via hole electrodes penetrating the ceramic layer and the high-thermal-expansion-coefficient material layer.

2. The ceramic substrate for an electrochemical element according to claim 1 , wherein a difference in the coefficient of thermal expansion between the ceramic layer and the high-thermal-expansion-coefficient material layer is 3 ppm or less.

3. The ceramic substrate for an electrochemical element according to claim 1 , wherein the ceramic material contains the lanthanum manganite material as the main component thereof.

4. The ceramic substrate for an electrochemical element according to claim 1 , wherein the high-thermal-expansion-coefficient material layer is a porous body.

5. The ceramic substrate for an electrochemical element according to claim 4 , wherein a porosity of the porous body is 20% or more.

6. The ceramic substrate for an electrochemical element according to claim 1 , wherein the ceramic substrate for the electrochemical element is configured as a separator of the electrochemical element.

7. The ceramic substrate for an electrochemical element according to claim 1 , wherein the ceramic layer is in the form of a sheet.

8. The ceramic substrate for an electrochemical element according to claim 1 , wherein the ceramic layer is stabilized zirconia or partially stabilized zirconia.

9. The ceramic substrate for an electrochemical element according to claim 8 , wherein the ceramic material contains the lanthanum manganite material as the main component thereof.

10. The ceramic substrate for an electrochemical element according to claim 1 , wherein the high-thermal-expansion-coefficient material layer is a first high-thermal-expansion-coefficient material layer on a first surface of the ceramic layer, and the ceramic substrate for an electrochemical element further comprises a second high-thermal-expansion-coefficient material layer on a second surface of the ceramic layer opposite the first surface.

11. The ceramic substrate for an electrochemical element according to claim 1 , wherein the high-thermal-expansion-coefficient material layer applies the compressive stress to the ceramic layer in a planar direction of the ceramic layer.

12. A fuel cell comprising:
a separator; and
a cell of a fuel cell,
wherein the separator comprises the ceramic substrate for an electrochemical element according to claim 1 .

13. A fuel cell stack comprising:
a plurality of stacked cells; and
a separator disposed between the adjacent cells of the plurality of stacked cells,
wherein the separator comprises the ceramic substrate for an electrochemical element according to claim 1 .

14. A method for manufacturing a ceramic substrate for an electrochemical element, the method comprising:
preparing a ceramic layer;
integrating, on a surface of the ceramic layer, a high-thermal-expansion-coefficient material layer comprising a ceramic material containing at least one of a lanthanum-manganite material, a lanthanum-cobaltite material, and a gadolinium doped ceria material as a main component thereof and that has a higher coefficient of thermal expansion than the ceramic layer so that compressive stress is applied to the ceramic layer; and
forming via hole electrodes that penetrate the ceramic layer and the high-thermal-expansion-coefficient material layer.

15. The method for manufacturing a ceramic substrate for an electrochemical element according to claim 14 , wherein the high-thermal-expansion-coefficient material layer comprises a ceramic that has, after firing to integrate the high-thermal-expansion-coefficient material layer on the ceramic layer, a higher coefficient of thermal expansion than the ceramic layer.

16. The method for manufacturing a ceramic substrate for an electrochemical element according to claim 15 , wherein a difference in the coefficient of thermal expansion between the ceramic layer and the high-thermal-expansion-coefficient material layer is 3 ppm or less.

17. The method for manufacturing a ceramic substrate for an electrochemical element according to claim 14 , wherein the ceramic material contains the lanthanum manganite material as the main component thereof.

18. The method for manufacturing a ceramic substrate for an electrochemical element according to claim 14 , wherein the ceramic layer is stabilized zirconia or partially stabilized zirconia.

19. The method for manufacturing a ceramic substrate for an electrochemical element according to claim 18 , wherein the ceramic material contains the lanthanum manganite material as the main component thereof.

20. The method for manufacturing a ceramic substrate for an electrochemical element according to claim 14 , wherein the high-thermal-expansion-coefficient material layer applies the compressive stress to the ceramic layer in a planar direction of the ceramic layer.

Assignees

• Murata Manufacturing Co

Inventors

• Nakai Hideaki

Classifications

• H01M2/1686

  Electricity · mapped topic

• H01M2/1646

  Electricity · mapped topic

• H01M8/0215 Primary

  Glass; Ceramic materials · CPC title

• Y02P70/56

  Cross-Sectional Technologies · mapped topic

• B32B18/00

  Layered products essentially comprising ceramics, e.g. refractory products · CPC title