Porous metal body, fuel cell, and method for producing porous metal body

Patent metadata

Field	Value
Publication number	US-2019044159-A1
Application number	US-201716073411-A
Country	US
Kind code	A1
Filing date	Jan 23, 2017
Priority date	Aug 4, 2015
Publication date	Feb 7, 2019
Grant date	—

Abstract

A porous metal body has a three-dimensional mesh-like structure skeleton and containing at least nickel and tin. The nickel content is 50 mass % or more, and the tin content is 5 mass % or more and 25 mass % or less. The porous metal body has a thickness of 0.10 mm or more and 0.50 mm or less.

First claim

1 . A porous metal body having a three-dimensional mesh-like structure skeleton and containing at least nickel and tin, wherein
a nickel content is 50 mass % or more, a tin content is 5 mass % or more and 25 mass % or less, and the porous metal body has a thickness of 0.10 mm or more and 0.50 mm or less.

2 . The porous metal body according to claim 1 , wherein the porous metal body has a porosity of 51% or more and 90% or less.

3 . The porous metal body according to claim 1 , wherein the porous metal body further contains chromium, and a chromium content is 1 mass % or more and 5 mass % or less.

4 . A fuel cell comprising the porous metal body according to claim 1 as a gas diffusion layer.

5 . A method for producing a porous metal body having a three-dimensional mesh-like structure skeleton and containing at least nickel and tin, the method comprising:
a step of subjecting a surface of a skeleton of a resin shaped body having a three- dimensional mesh-like structure skeleton to an electrical conduction treatment by applying an electrical conduction material containing a tin powder to the surface of the skeleton of the resin shaped body such that the porous metal body has a tin content of 5 mass % or more and 25 mass % or less; a step of forming a resin structure by forming a nickel-coating layer on the resin shaped body such that the porous metal body has a nickel content of 50 mass % or more; a step of forming a porous body containing nickel and tin by removing the resin shaped body from the resin structure; a step of diffusing tin and nickel by heating the porous body at 1000° C. or higher for 5 minutes or longer; a step of cooling the heated porous body at a rate of 30° C./min or higher at least until the porous body has a temperature of 550° C. or lower; and a step of rolling the cooled porous body to a thickness of 0.10 mm or more and 0.50 mm or less.

6 . A method for producing a porous metal body having a three-dimensional mesh-like structure skeleton and containing at least nickel and tin, the method comprising:
a step of subjecting a surface of a skeleton of a resin shaped body having a three- dimensional mesh-like structure skeleton to an electrical conduction treatment; a step of forming a resin structure by forming a tin-coating layer and a nickel-coating layer on the resin shaped body such that the porous metal body has a tin content of 5 mass % or more and 25 mass % or less and a nickel content of 50 mass % or more; a step of forming a porous body containing nickel and tin by removing the resin shaped body from the resin structure; a step of diffusing tin and nickel by heating the porous body at 1000° C. or higher for 5 minutes or longer; a step of cooling the heated porous body at a rate of 30° C./min or higher at least until the porous body has a temperature of 550° C. or lower; and a step of rolling the cooled porous body to a thickness of 0.10 mm or more and 0.50 mm or less. 93607999.1

Assignees

• Sumitomo Electric Industries

Inventors

• Miyamoto Kazunari
• Awazu Tomoyuki
• Majima Masatoshi
• Okuno Kazuki
• Higashino Takahiro

Classifications

• C22C13/00

  Alloys based on tin · CPC title

• H01M8/0232 Primary

  Metals or alloys · CPC title

• C22C19/03 Primary

  based on nickel · CPC title

• C22C19/05

  with chromium · CPC title

• C25D1/08

  Perforated or foraminous objects, e.g. sieves (C25D1/10 takes precedence) · CPC title