# US 10,308,558 B2 · Process of manufacturing cemented carbide and a product obtained thereof

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- Number: US 10,308,558 B2
- Document ID: US10308558B2
- Status: Granted
- Kind: B2
- Application number: 14/894,276
- Filed: 2014-05-28
- Published: 2016-05-05
- Granted: 2019-06-04
- Earliest claimed: 2013-05-31
- Assignees: Sandvik Intellectual Property AB
- Applicants: Sandvik Intellectual Property AB
- Inventors: Jose Garcia; Susanne Norgren
- Web page: https://patentgrep.com/patent/US10308558B2

## CPC

- C04B 35/5626: {based on tungsten carbides}
- 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)
- C22C 29/005: {comprising a particular metallic binder}
- C22C 29/02: based on carbides or carbonitrides
- B22F 2005/001: {Cutting tools, earth boring or grinding tool other than table ware}
- B22F 2009/041: {by mechanical alloying, e.g. blending, milling}
- B22F 2201/02: Nitrogen
- B22F 2201/20: Use of vacuum
- B22F 2302/10: Carbide
- C22C 29/08: based on tungsten carbide
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- 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)

## Abstract

A process of manufacturing cemented carbide and to a product obtained thereof, wherein hex doped WC is subjected to nitrogen before and/or during sintering.

## Claims

### Claim 1

A process of manufacturing a cemented carbide, said process comprising the steps of:
a) forming a slurry including a milling liquid, binder metal and hard constituents, wherein said hard constituents include hex doped WC;
b) subjecting said slurry to milling and drying to form a powder mixture; and
c) subjecting the powder mixture to pressing and sintering, wherein the hex doped WC is subjected to nitrogen both by the addition of a transition metal nitride or transition metal carbonitride to said slurry and by subjecting the hex doped WC to nitrogen gas during sintering.

### Claim 2 (depends on 1)

The process according to claim 1, wherein said transition metal nitride or transition metal carbonitride is selected from the element group 4, 5 and 6 and mixture thereof.

### Claim 3 (depends on 2)

The process according to claim 2, wherein said transition metal or transition metal carbonitride is selected from the group of TiN, Ti(C,N), V(C,N), Zr (C,N), TaN, NbN, Ta(C,N) and mixtures thereof.

### Claim 4 (depends on 1)

The process according to claim 1, wherein the sintering is performed under vacuum.

### Claim 5 (depends on 1)

The process according to claim 1, wherein the doped WC is doped with a transition metal selected from the group of Ta, Ti, Nb, V, Cr and mixtures thereof.

### Claim 6 (depends on 5)

The process according to claim 5, wherein said transition metal is Ta and/or Ti.

### Claim 7 (depends on 1)

The process according to claim 1, wherein the binder metal is selected from the group consisting of Cr, Mo, Fe, Co and Ni.

### Claim 8 (depends on 1)

The process according to claim 1, wherein said binder metal is Co.

### Claim 9 (depends on 1)

The process according to claim 1, wherein said cemented carbide includes WC and hex doped WC in the range of from 65 to 90 wt %, Co in the range of from 3 to 15 wt %, Ta in the range of from 1 to 5 wt %, and Ti in the range of from 0.5 to 5 wt %.

### Claim 10 (depends on 1)

A cemented carbide made according to the process of claim 1.

### Claim 11 (depends on 10)

The cemented carbide according to claim 10, wherein the cemented carbide includes a surface and a gamma-phase free gradient layer disposed on the surface.

### Claim 12 (depends on 11)

The cemented carbide according to claim 11, further comprising hex doped WC.

### Claim 13 (depends on 1)

A cutting tool comprising a cemented carbide made according to the process of claim 1.

### Claim 14 (depends on 13)

The cutting tool according to claim 13, wherein the cutting tool includes a surface and a gamma-phase free gradient layer disposed on the surface.

### Claim 15 (depends on 14)

The cutting tool according to claim 14, wherein the gamma-phase free gradient layer and the cemented carbide include hex doped WC.