ALLOY MEMBER

• US 20200136154A1
• Filed: 12/27/2019
• Published: 04/30/2020
• Est. Priority Date: 09/07/2018
• Status: Active Grant

• Current Assignee: NGK Insulators Limited
• Original Assignee: NGK Insulators Limited
• Inventors: TANAKA, Yuki, NAKAMURA, Toshiyuki, OHMORI, Makoto
• Granted Patent: US 11,081,705 B2
• Time in Patent Office: Days
• CPC Class Codes: B32B 3/30 characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs apertured layer B32B3/266; layer with cavities or internal voids B32B3/26
• CPC Class Codes: C23C 14/028 Physical treatment to alter the texture of the substrate surface, e.g. grinding, polishing
• CPC Class Codes: C23C 14/083 of refractory metals or yttrium
• CPC Class Codes: C23C 28/042 including a refractory ceramic layer, e.g. refractory metal oxides, ZrO2, rare earth oxides
• CPC Class Codes: H01M 2008/1293 Fuel cells with solid oxide electrolytes
• CPC Class Codes: H01M 4/662 Alloys collectors of lead alloys H01M4/685
• CPC Class Codes: H01M 8/0208 Alloys
• CPC Class Codes: H01M 8/021 Alloys based on iron
• CPC Class Codes: H01M 8/0215 Glass; Ceramic materials
• CPC Class Codes: H01M 8/0228 in the form of layered or coated products
• CPC Class Codes: H01M 8/0232 Metals or alloys
• CPC Class Codes: H01M 8/0236 Glass; Ceramics; Cermets
• CPC Class Codes: H01M 8/0245 in the form of layered or coated products
• CPC Class Codes: H01M 8/2483 characterised by internal manifolds
• CPC Class Codes: H01M 8/2484 characterised by external manifolds
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/50 Fuel cells
• CPC Class Codes: Y10T 428/249956 Void-containing component is inorganic

Abstract

The alloy member includes a base member constituted by an alloy material containing chromium, a chromium oxide layer for covering at least a portion of a surface of the base member, a pore that is formed in an interface region of the base member that is located 30 μm or less from an interface between the chromium oxide layer and the base member, and an extending portion extending from the pore into the base member. The pore is configured to inhibit separation of the chromium oxide layer from the base member The extending portion contains an oxide of an element whose equilibrium oxygen pressure is lower than that of a major element of the base member.

Claims

1. An alloy member configured to be used in an electrochemical cell stack, the alloy member comprising:

a base member constituted by an alloy material containing chromium;

a chromium oxide layer covering at least a portion of a surface of the base member;

a pore formed in an interface region of the base member that is located 30 μ

m or less from an interface between the chromium oxide layer and the base member, the pore configured to inhibit separation of the chromium oxide layer from the base member; and

an extending portion extending from the pore into the base member,

the extending portion containing an oxide of an element whose equilibrium oxygen pressure is lower than equilibrium oxygen pressure of a major element of the base member.

2. The alloy member according to claim 1, comprising

a metal oxide disposed on an inner surface of the pore.