Cemented carbide with alternative binder

Patent metadata

Field	Value
Publication number	US-11850663-B2
Application number	US-201917252939-A
Country	US
Kind code	B2
Filing date	Jun 26, 2019
Priority date	Jun 29, 2018
Publication date	Dec 26, 2023
Grant date	Dec 26, 2023

Abstract

A cemented carbide including an eta phase and a Ni—Al binder is provided. The Ni—Al binder includes intermetallic y′-Ni3Al -precipitates embedded in a substitutional solid solution matrix of Al and Ni. A weight ratio Al/Ni of between 0.03 to 0.10, wherein a total amount of Ni and Al is between 70 to 95 wt % of the total binder A method of making a cutting tool is also provided.

First claim

The invention claimed is:

1. A cutting tool comprising a cemented carbide substrate including tungsten carbide and 3 to 20 wt % binder, the binder including intermetallic y′-Ni 3 Al-precipitates having an average grain size of between 10 and 1000 nm embedded in a substitutional solid solution matrix having Al and Ni with a weight ratio Al/Ni of between 0.03 to 0.10, wherein a total amount of Ni and Al is between 80 to 95 wt % of a total binder and wherein the cemented carbide substrate includes a volume fraction of eta phase of between 0.8 and 8 vol % and a total carbon content in the cemented carbide substrate, C (wt %), that is below a value X, where X is given by the following equation:

X
=

(

0.0617
*

wt
⁢
%
⁢

Al

wt
⁢
%
⁢

Ni

-
0.0768

)

*

(

wt
⁢
%
⁢

Ni

+

wt
⁢
%
⁢

Al

)

+
6.1323

,

wherein the wt % Al and the wt % Ni is the amount present in the cemented carbide substrate.

2. The cutting tool according to claim 1 , wherein an average grain of size of the intermetallic y′-Ni 3 Al-precipitates is between 10 and 500 nm.

3. The cutting tool according to claim 1 , wherein the weight ratio between Al/Ni is between 0.03 to 0.07.

4. The cutting tool according to claim 1 , wherein the cemented carbide substrate is essentially free of Co.

5. The cutting tool according to claim 1 , wherein the cemented carbide substrate is essentially free of Mo.

6. A method of making a cutting tool according to claim 1 , the method comprising the steps of:
providing powders forming hard constituents including WC;
providing Al and Ni containing powder(s) forming the binder phase;
providing a milling liquid; and
milling, drying, pressing and sintering the powders into a cemented carbide.

7. The method of making a cutting tool according to claim 6 , wherein the Al and Ni containing powder(s) is added as a pre-alloyed powder.

8. The method of making a cutting tool according to claim 6 , wherein the cutting tool is provided with a wear resistant CVD or PVD coating.

Assignees

• Sandvik Coromant Ab

Inventors

• Garcia Jose Luis
• Kaplan Bartek
• Collado Cipres Veronica

Classifications

• B22F2207/05

  eta-phase · CPC title

• B22F2302/15

  Carbonitride · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• B22F2999/00

  Aspects linked to processes or compositions used in powder metallurgy · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title