# US 10,442,000 B2 · Titanium-based powder, and ingot and sintered article thereof

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- Number: US 10,442,000 B2
- Document ID: US10442000B2
- Status: Granted
- Kind: B2
- Application number: 15/552,540
- Filed: 2016-02-17
- Published: 2018-01-25
- Granted: 2019-10-15
- Earliest claimed: 2015-03-05
- Assignees: Toho Titanium Co., Ltd.
- Applicants: Toho Titanium Co., Ltd.
- Inventors: Nobuo Fukada; Osamu Kanou; Shigehisa Takenaka
- Web page: https://patentgrep.com/patent/US10442000B2

## CPC

- B22F 1/00: Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F 1/065: Spherical particles
- B22F 9/10: using centrifugal force
- C22C 1/0458: {Alloys based on titanium, zirconium or hafnium}
- B22F 9/04: starting from solid material, e.g. by crushing, grinding or milling ({C22C1/1084 takes precedence}; crushing, grinding or milling, in general, see the relevant subclasses, e.g. B02C)
- B22F 9/08: by casting, e.g. through sieves or in water, by atomising or spraying (using electric discharge B22F9/14)
- B22F 9/082: {atomising using a fluid (using centrifugal force B22F9/10)}
- B22F 10/18: by mixing binder with metal in filament form, e.g. fused filament fabrication [FFF]
- B22F 10/20: Direct sintering or melting
- B22F 10/28: Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
- Y02P 10/25: Process efficiency
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

Provided are a titanium-based powder excellent in fluidity and shape retention property, and an ingot and a sintered article obtained using the titanium-based powder as a material. The titanium-based powder has an average circularity of 0.815 or more and less than 0.870, a CV value of particle sizes of 22 or more and 30 or less, and an angle of repose of 29 degrees or more and 36 degrees or less.

## Claims

### Claim 1

A titanium-based powder, which has an average circularity of 0.815 or more and less than 0.870, a coefficient of variation of particle sizes of 22 or more and 30 or less, and an angle of repose of 29 degrees or more and 36 degrees or less,
wherein the titanium-based powder contains a spherical titanium-based powder and a non-spherical titanium-based powder,
wherein the average circularity of primary particles of the spherical titanium-based powder is 0.85 or more and 1.0 or less, and
wherein the average circularity of primary particles of the non-spherical titanium-based powder is 0.50 or more and less than 0.85.

### Claim 2 (depends on 1)

The titanium-based powder according to claim 1,
wherein the average circularity of primary particles of the non-spherical titanium-based powder is 0.50 or more and 0.81 or less.

### Claim 3 (depends on 1)

The titanium-based powder according to claim 1, which contains spherical titanium-based particles in a number ratio of 35% to 80%, and contains non-spherical titanium-based particles in a number ratio of 20% to 65%.

### Claim 4 (depends on 1)

The titanium-based powder according to claim 1, which is the titanium-based powder obtained by mixing the spherical titanium-based powder and the non-spherical titanium-based powder.

### Claim 5 (depends on 4)

The titanium-based powder according to claim 4, wherein the spherical titanium-based powder is a titanium-based powder produced by an atomization method, a titanium-based powder produced by a plasma rotating electrode method, a titanium-based powder obtained by subjecting a titanium-based powder produced by a hydrodehydrogenation method to a plasma processing, a titanium-based powder obtained by subjecting a titanium-based powder produced by a pulverization method to a plasma processing, or a titanium-based powder obtained by mixing two or more thereof.

### Claim 6 (depends on 4)

The titanium-based powder according to claim 4, wherein the non-spherical titanium-based powder is a titanium-based powder produced by a hydrodehydrogenation method, a titanium-based powder produced by a pulverization method, or a titanium-based powder obtained by mixing the foregoing powders.

### Claim 7 (depends on 1)

A method of manufacturing an ingot comprising:
preparing a powder containing the titanium-based powder according to claim 1, and
melting the prepared powder.

### Claim 8 (depends on 1)

A method of manufacturing a sintered article comprising:
preparing a powder containing the titanium-based powder according to claim 1, and
sintering the prepared powder.