New process of manufacturing cemented carbide and a product obtained thereof

Patent metadata

Field	Value
Publication number	US-2016122250-A1
Application number	US-201414894276-A
Country	US
Kind code	A1
Filing date	May 28, 2014
Priority date	May 31, 2013
Publication date	May 5, 2016
Grant date	—

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.

First claim

1 . A process of manufacturing a cemented carbide, said process comprises 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 before and/or during sintering.

2 . The process according to claim 1 , wherein the hex doped WC is subjected to nitrogen by the addition of a transition metal nitride or transition metal carbonitride to said slurry before step b).

3 . The process according to claim 2 , wherein said transition metal nitride or transition metal carbonitride is selected from the element group 4, 5 and 6 and mixture thereof.

4 . The process according to claim 3 , 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.

5 . The process according to claim 1 , wherein the doped WC is subjected to nitrogen gas before sintering.

6 . The process according to claim 1 , wherein the doped WC is subjected to nitrogen gas during sintering.

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

8 . 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.

9 . The process according to claim 8 , wherein said transition metal is Ta and/or Ti.

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

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

12 . The process of 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 %.

13 . (canceled)

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

15 . The cemented carbide according to claim 14 , wherein the cemented carbide includes a surface and a gamma-phase free gradient layer disposed on the surface.

16 . The cemented carbide according to claim 15 , wherein the gradient free layer is a gradient cemented carbide including hex doped WC.

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

18 . The cutting tool according to claim 17 , wherein the cutting tool includes a surface and a gamma-phase free gradient layer disposed on the surface.

19 . The cutting tool according to claim 18 , wherein the gradient free layer is a gradient cemented carbide including hex doped WC.

Assignees

• Sandvik Intellectual Property

Inventors

• Garcia Jose
• Norgren Susanne

Classifications

• C22C29/02 Primary

  based on carbides or carbonitrides · CPC title

• C04B35/5626 Primary

  based on tungsten carbides · CPC title

• C22C29/005

  comprising a particular metallic binder · CPC title

• B22F2201/02

  Nitrogen · CPC title

• B22F2009/041

  by mechanical alloying, e.g. blending, milling · CPC title