Alloy member, cell stack, and cell stack device

Patent metadata

Field	Value
Publication number	US-11916262-B2
Application number	US-202318187802-A
Country	US
Kind code	B2
Filing date	Mar 22, 2023
Priority date	Sep 7, 2018
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

An alloy member includes a base member that includes a recess in a surface of the base member and is constituted by an alloy material containing chromium, an anchor portion is disposed in the recess and contains an oxide containing manganese and a covering layer is connected to the anchor portion and contains a low-equilibrium oxygen pressure element whose equilibrium oxygen pressure is lower than that of chromium.

First claim

The invention claimed is:

1. A cell stack device comprising:
an electrochemical cell; and
an alloy member, wherein
the alloy member is a manifold for supporting a base end portion of the electrochemical cell and comprises:
a base member including a plurality of recesses in a surface thereof and constituted by an alloy material containing chromium;
an anchor portion disposed in each of the recesses and containing an oxide including manganese, each of the anchor portions having an outer surface comprising a first outer surface that is in contact with the recess and a second outer surface that is not in contact with the recess; and
a covering layer connected directly to and completely covering the second outer surface of each anchor portion and containing a low-equilibrium oxygen pressure element whose equilibrium oxygen pressure is lower than the equilibrium oxygen pressure of chromium,
the anchor portions have a different composition from the covering layer and the covering layer is formed by applying a ceramic paste material containing the low-equilibrium oxygen pressure element onto the surface of the base member and performing a heat treatment.

2. The cell stack device according to claim 1 , wherein a cation ratio of the low-equilibrium oxygen pressure element in the covering layer is 0.05 or more.

3. The cell stack device according to claim 1 , wherein the low-equilibrium oxygen pressure element is manganese.

4. The cell stack device according to claim 1 , wherein the covering layer is a ceramic material.

5. The cell stack device according to claim 4 , wherein the ceramic material comprises at least one member selected from the group consisting of alumina, silica, zirconia, crystallized glass and a combination thereof.

6. The cell stack device according to claim 4 , wherein the ceramic material comprises at least one member selected from the group consisting of a perovskite complex oxide and a spinel complex oxide.

Assignees

• Ngk Insulators Ltd

Inventors

• Matsuno Yuta
• Tanaka Yuki
• Nakamura Toshiyuki
• Ohmori Makoto

Classifications

• H01M8/0208 Primary

  Alloys · CPC title

• H01M8/0217

  Complex oxides, optionally doped, of the type AMO3, A being an alkaline earth metal or rare earth metal and M being a metal, e.g. perovskites · CPC title

• H01M8/0228

  in the form of layered or coated products · CPC title

• H01M8/2483

  characterised by internal manifolds · CPC title

• H01M8/2485

  Arrangements for sealing external manifolds; Arrangements for mounting external manifolds around a stack · CPC title