# US 12,110,576 B2 · WC-based cemented carbide powder, WC-based cemented carbide member, and manufacturing method for WC-based cemented carbide member

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,110,576 B2
- Document ID: US12110576B2
- Status: Granted
- Kind: B2
- Application number: 17/636,602
- Filed: 2020-08-27
- Published: 2022-09-15
- Granted: 2024-10-08
- Earliest claimed: 2019-08-27
- Assignees: Proterial, Ltd.
- Applicants: Hitachi Metals, Ltd.
- Inventors: Hiroshi Shiratori; Kazuya Shinagawa; Shuho Koseki; Kousuke Kuwabara; Yasuhiko Otsubo; Shinya Okamoto
- Web page: https://patentgrep.com/patent/US12110576B2

## CPC

- C22C 32/0052: {only carbides}
- B22F 1/00: Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F 10/20: Direct sintering or melting
- B22F 10/64: by thermal means (control of energy beam parameters for post heating B22F10/364)
- B33Y 10/00: Processes of additive manufacturing
- B33Y 40/20: Post-treatment, e.g. curing, coating or polishing
- B33Y 70/00: Materials specially adapted for additive manufacturing
- B33Y 80/00: Products made by additive manufacturing
- C22C 29/005: {comprising a particular metallic binder}
- C22C 29/08: based on tungsten carbide
- B22F 5/007: {of moulds}
- B22F 9/026: {Spray drying of solutions or suspensions}
- B22F 10/362: for preheating
- B22F 2201/10: Inert gases
- B22F 2302/10: Carbide
- B22F 2998/10: Processes characterised by the sequence of their steps
- B22F 2999/00: Aspects linked to processes or compositions used in powder metallurgy
- Y02P 10/25: Process efficiency
- Y10T 428/12014: having metal particles
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- 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
- B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Provided are a WC-based cemented carbide powder from which a WC-based cemented carbide member excellent in high thermal conductivity and high abrasion resistance can be manufactured, a WC-based cemented carbide member, and a manufacturing method for a WC-based cemented carbide member. The WC-based cemented carbide powder of the present invention includes WC, Cu, and at least one of Co, Fe, and Cr. The content of WC is equal to or more than 40 mass %, the content of at least one of Co, Fe, and Cr is equal to or more than 25 mass % and less than 60 mass %, and the ratio a/b of the content ‘a’ of Cu and the content ‘b’ of at least one of Co, Fe, and Cr satisfies 0.070≤a/b≤1.000.

## Claims

### Claim 1

A WC-based cemented carbide powder for additive manufacturing method consisting of:
WC, Cu, and at least one of Co, Fe, and Cr,
wherein a content of the WC in mass ratio is equal to or more than 40 mass %,
a content of the at least one of Co, Fe, and Cr is equal to or more than 30 mass % and less than 60 mass %, and
a ratio a/b of a content ‘a’ of the Cu and the content ‘b’ of the at least one of Co, Fe, and Cr satisfies 0.070≤a/b≤1.000.

### Claim 2

A WC-based cemented carbide member that is a laminate shaped body consisting of:
WC particles, Cu, and a metallic bonding phase consisting of at least one of Co, Fe, and Cr,
wherein a content of the WC particles is equal to or more than 40 mass %,
a content of the at least one of Co, Fe, and Cr is equal to or more than 30 mass % and less than 60 mass %, and
a ratio a/b of a content ‘a’ of the Cu and the content ‘b’ of the at least one of Co, Fe, and Cr satisfies 0.070≤a/b≤1.000.

### Claim 3 (depends on 2)

The WC-based cemented carbide member according to claim 2, wherein a Cu phase having an equivalent circle diameter of 10 to 50 nm is dispersedly precipitated in the metallic bonding phase.

### Claim 4 (depends on 2)

The WC-based cemented carbide member according to claim 2, wherein a Cu phase having an average particle diameter of 1 to 100 μm is dispersedly precipitated in the metallic bonding phase.

### Claim 5

d) A manufacturing method for a WC-based cemented carbide member, comprising:
preheating a base material comprising a metal to or above 350° C.; and
melting and solidifying a WC-based cemented carbide powder by use of a heat source to apply additive manufacturing to a surface of the base material,
wherein the WC-based cemented carbide powder comprises consists of WC, Cu, and at least one of Co, Fe, and Cr,
a content of the WC is equal to or more than 40 mass %,
a content of the at least one of Co, Fe, and Cr is equal to or more than 30 mass % and less than 60 mass %, and
a ratio a/b of a content ‘a’ of the Cu and the content ‘b’ of the at least one of Co, Fe, and Cr satisfies 0.070≤a/b≤1.000.

### Claim 6 (depends on 5)

The manufacturing method for the WC-based cemented carbide member according to claim 5, further comprising:
performing heat treatment on the WC-based cemented carbide member obtained by the additive manufacturing at a temperature equal to or more than 400° C. and less than 1250° C.

### Claim 7 (depends on 6)

The manufacturing method for the WC-based cemented carbide member according to claim 6, wherein the performing the heat treatment is carried out in an inert gas atmosphere.

### Claim 8 (depends on 1)

The WC-based cemented carbide powder according to claim 1, wherein the ratio a/b of the content ‘a’ of the Cu and the content ‘b’ of the at least one of Co, Fe, and Cr satisfies 0.090≤a/b≤1.000.

### Claim 9 (depends on 1)

The WC-based cemented carbide powder according to claim 1, wherein the ratio a/b of the content ‘a’ of the Cu and the content ‘b’ of the at least one of Co, Fe, and Cr satisfies 0.140≤a/b≤1.000.

### Claim 10 (depends on 1)

The WC-based cemented carbide powder according to claim 1, wherein the ratio a/b of the content ‘a’ of the Cu and the content ‘b’ of the at least one of Co, Fe, and Cr satisfies 0.278≤a/b≤1.000.

### Claim 11 (depends on 2)

The WC-based cemented carbide member according to claim 2, wherein the ratio a/b of the content ‘a’ of the Cu and the content ‘b’ of the at least one of Co, Fe, and Cr satisfies 0.090≤a/b≤1.000.

### Claim 12 (depends on 2)

The WC-based cemented carbide member according to claim 2, wherein the ratio a/b of the content ‘a’ of the Cu and the content ‘b’ of the at least one of Co, Fe, and Cr satisfies 0.140≤a/b≤1.000.

### Claim 13 (depends on 2)

The WC-based cemented carbide member, according to claim 2, wherein the ratio a/b of the content ‘a’ of the Cu and the content ‘b’ of the at least one of Co, Fe, and Cr satisfies 0.278≤a/b≤1.000.