Method for manufacturing porous metal body, and porous metal body

Patent metadata

Field	Value
Publication number	US-12090549-B2
Application number	US-202017794300-A
Country	US
Kind code	B2
Filing date	Dec 15, 2020
Priority date	Feb 27, 2020
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

A method for manufacturing a porous metal body according to the present invention includes: a surface oxidizing step of heating a titanium-containing powder in an atmosphere containing oxygen at a temperature of 250° C. or more for 30 minutes or more to provide a surface-oxidized powder; and a sintering step of depositing the surface-oxidized powder in a dry process, and sintering the surface-oxidized powder by heating it in a reduced pressure atmosphere or an inert atmosphere at a temperature of 950° C. or more.

First claim

The invention claimed is:

1. A method for manufacturing a porous metal body containing titanium, the method comprising:
a surface oxidizing step of heating a titanium-containing powder in an atmosphere containing oxygen at a temperature of 250° C. or more for 30 minutes or more to provide a surface-oxidized powder, the titanium-containing powder being a crushed powder; and
a sintering step of depositing the surface-oxidized powder in a dry process, and sintering the surface-oxidized powder by heating it in a reduced pressure atmosphere or an inert atmosphere at a temperature of 950° C. or more,
wherein the porous metal body is in a form of a sheet having a thickness of 5.0 mm or less and the porous metal body has a porosity of 30% to 70%, and
wherein the porous metal body has a k of 1.1×10 6 to 10.0×10 6 , the k being determined using a bending strength B (MPa), a permeability P (μm/(Pa·s)), and a thickness t (mm) by the following equation: k=B/((P·t 0.33 ) −1.902 ).

2. The method according to claim 1 , wherein the titanium-containing powder used in the surface oxidizing step has an average particle diameter of 15 μm to 90 μm.

3. The method according to claim 1 , wherein in the sintering step, the surface-oxidized powder is deposited without applying pressure at least in a deposition direction and sintered.

4. The method according to claim 1 , wherein in the surface oxidizing step, the titanium-containing powder has a titanium content of 75% by mass or more, an iron content of 0.08% by mass or less, an oxygen content of 0.40% by mass or less, and a carbon content of 0.02% by mass or less.

5. The method according to claim 1 , wherein the titanium-containing powder is a hydride de-hydride titanium powder and/or a titanium hydride powder.

6. The method according to claim 1 , wherein the porous metal body has a porosity of 30% to 49%.

7. The method according to claim 1 , wherein in the surface oxidizing step, the heating temperature is within 250° C. to 450° C.

8. The method according to claim 1 , wherein the titanium-containing powder has an average particle diameter of 16 μm to 30 μm.

9. The method according to claim 1 , wherein in the sintering step, the highest temperature is within 1000° C. to 1100° C.

Assignees

• Toho Titanium Co Ltd

Inventors

• Inoue Yosuke
• TSUMAGARI Syogo
• Goto Yasuhiko

Classifications

• C22C1/04

  by powder metallurgy (C22C1/08 takes precedence) · CPC title

• B22F1/145

  Chemical treatment, e.g. passivation or decarburisation · CPC title

• C22C14/00

  Alloys based on titanium · CPC title

• B22F2304/10

  Micron size particles, i.e. above 1 micrometer up to 500 micrometer · CPC title

• B22F2302/25

  Oxide · CPC title