Method of making a cBN material

Patent metadata

Field	Value
Publication number	US-10252947-B2
Application number	US-201314404034-A
Country	US
Kind code	B2
Filing date	May 31, 2013
Priority date	May 31, 2012
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

A cBN material and a method of making a cBN material, the method including the steps of providing a powder mixture comprising cBN grains, aluminum and a Ti(CxNyOz)a powder, subjecting the powder mixture to a milling to form a powder blend, subjecting the powder blend to a forming operation to form a green body, subjecting the green body to a pre-sintering step, at a temperature between 650 to 950° C., to form a pre-sintered body, and subjecting the pre-sintered body to a HPHT operation to form the cBN material. For the Ti(CxNyOz)a powder, 0.05≤z≤0.4. In addition, a cBN material includes cBN grains, an Al2O3 phase, a binder phase of TiC, TiN and/or TiCN, W and Co, whereby a quotient Q is <0.25 of the cBN material.

First claim

The invention claimed is:

1. A method of making a cBN material comprising:
providing a powder mixture comprising cBN grains, aluminum and a Ti(C x N y O z ) a powder;
subjecting the powder mixture to a milling operation to form a powder blend;
subjecting the powder blend to a forming operation to form a green body;
subjecting said green body to a pre-sintering step, at a temperature between about 650 to about 950° C., to form a pre-sintered body; and
subjecting said pre-sintered body to a HPHT operation to form the cBN material, wherein for said Ti(C x N y O z ) a powder, 0.9≤a≤1.1; 0.5≤x≤0.95; 0≤y≤0.3; and 0.05≤z≤0.4.

2. A method according to claim 1 , wherein the Ti(C x N y O z ) a powder is provided in an amount of 10 to 70 wt % of the total dry powder weight of the powder mixture.

3. A method according to claim 1 , wherein for the Ti(C x N y O z ) a powder, 0.5≤x≤0.95, 0.0≤y≤0.3; and 0.1≤z≤0.3.

4. A method according to claim 1 , wherein 0.7≤x≤0.95 and stoichiometric TiN is added in an amount so that TiN replaces the Ti(C x N y O z ) a powder by between 5 to 55 wt %.

5. A method according to claim 4 , wherein 0.7≤x≤0.95 and stoichiometric TiN is added in an amount so that TiN replaces the Ti(C x N y O z ) a powder by between 25 to 55 wt %.

6. A method according to claim 1 , wherein the aluminum in the powder mixture is elemental aluminum.

7. A method according to claim 1 , wherein aluminum is provided in an amount of 1 to 10 wt % of the total dry powder weight of the powder mixture.

8. A method according to claim 1 , wherein W is added such that the amount of W is 1 to 12 wt % of the cBN material, and Co is added such that the amount of Co is between 0.5 to 9 wt % of the cBN material, where the W/Co ratio is between 1.0 to 2.0.

9. A method according to claim 1 , wherein a part of the Ti(C x N y O z ) a powder is replaced by stoichiometric TiN, TiC and/or TiCN.

10. A method according to claim 1 , wherein a milling liquid is added to the powder mixture to form a slurry and wherein the milling operation is followed by a drying operation to form the powder blend.

11. A method according to claim 10 , wherein the drying operation is done by spray drying.

12. A method according to claim 1 , wherein the pre-sintering is done at a temperature of between about 850° C. to about 930° C.

13. A method according to claim 1 , wherein the HPHT operation is performed at a pressure of about 55 to about 75 kbar and a temperature from about 1300 to about 1600° C.

14. A method of making a cBN material comprising:
providing a powder mixture comprising cBN grains, elemental aluminum and a Ti(C x N y O z ) a powder;
subjecting the powder mixture to a milling operation to form a powder blend;
subjecting the powder blend to a forming operation to form a green body;
subjecting said green body to a pre-sintering step, at a temperature between about 650 to about 950° C., to form a pre-sintered body; and
subjecting said pre-sintered body to a HPHT operation to form the cBN material,
wherein for said Ti(C x N y O z ) a powder, 0.9≤a≤1.1, 0.5≤x≤0.95; 0.00≤y≤0.3; and 0.1≤z≤0.3.

15. A method according to claim 14 , wherein 0.7≤x≤0.95 and stoichiometric TiN is added in an amount so that TiN replaces the Ti(C x N y O z ) a powder by between 5 to 55 wt %.

16. A method according to claim 15 , wherein 0.7≤x≤0.95 and stoichiometric TiN is added in an amount so that TiN replaces the Ti(C x N y O z ) a powder by between 25 to 55 wt %.

17. A method of making a cBN material comprising:
providing a powder mixture comprising cBN grains, elemental aluminum and a Ti(C x N y O z ) a powder;
subjecting the powder mixture to a milling operation to form a powder blend;
subjecting the powder blend to a forming operation to form a green body;
subjecting said green body to a pre-sintering step, at a temperature between about 650 to about 950° C., to form a pre-sintered body; and
subjecting said pre-sintered body to a HPHT operation to form the cBN material,
wherein for said Ti(C x N y O z ) a powder, 0.9≤a≤1.1, 0.3≤x≤0.95; 0.00≤y≤0.5; and 0.05≤z≤0.3.

18. A method according to claim 17 , wherein 0.7≤x≤0.95 and stoichiometric TiN is added in an amount so that TiN replaces the Ti(C x N y O z ) a powder by between 5 to 55 wt %.

19. A method according to claim 18 , wherein 0.7≤x≤0.95 and stoichiometric TiN is added in an amount so that TiN replaces the Ti(C x N y O z ) a powder by between 25 to 55 wt %.

Assignees

• Sandvik Intellectual Property
• Hyperion Materials & Tech Sweden Ab

Inventors

• Weinl Gerold
• Kauppi Annika
• Martensson Malin
• Selinder Torbjorn
• Shao Rui

Classifications

• C04B2235/3852

  Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride · CPC title

• C04B2235/405

  Iron group metals · CPC title

• C04B35/638

  Removal thereof · CPC title

• C04B35/645 Primary

  Pressure sintering · CPC title

• C04B2235/402

  Aluminium · CPC title