Cubic boron nitride composite material, method of using it, method of making it and tool comprising it

Patent metadata

Field	Value
Publication number	US-10472288-B2
Application number	US-201515324171-A
Country	US
Kind code	B2
Filing date	Jul 6, 2015
Priority date	Jul 8, 2014
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A composite material and a method of using the composite material. The composite material consists of at least 65 volume percent cubic boron nitride (cBN) grains dispersed in a binder matrix, the binder matrix comprising a plurality of microstructures bonded to the cBN grains and a plurality of intermediate regions between the cBN grains; the microstructures comprising nitride or boron compound of a metal; and the intermediate regions including a silicide phase containing the metal chemically bonded with silicon; in which the content of the silicide phase is 2 to 6 weight percent of the composite material, and in which the cBN grains have a mean size of 0.2 to 20 μm.

First claim

The invention claimed is:

1. Composite material consisting of:
at least 65 volume per cent cubic boron nitride grains dispersed in a binder matrix, the binder matrix comprising
a plurality of microstructures bonded to the cubic boron nitride grains and
a plurality of intermediate regions between the cubic boron nitride grains;

the microstructures comprising titanium nitride; and
the intermediate regions including a silicide phase containing titanium chemically bonded with silicon;
in which
the content of the silicide phase is 2 to 6 weight per cent of the composite material; and
the cubic boron nitride grains have a mean size of 0.2 to 20 μm.

2. Composite material as claimed in claim 1 , in which the microstructures further comprise titanium di-boride.

3. Composite material as claimed in claim 1 , in which the silicide comprises a titanium silicide material having the chemical formula Ti x ,Si y , where x is 0.9 to 1.1 and y is 0.9 to 1.1.

4. Composite material as in claim 1 , in which the silicide phase is spaced apart from the cubic boron nitride grains by the microstructures.

5. Composite material as claimed in claim 1 , in which the microstructures are in the form of coating layers bonded to surface areas of the cubic boron nitride grains.

6. Composite material as claimed in claim 1 , in which the content of the cubic boron nitride grains is at least 80 volume per cent of the composite material.

7. Composite material as claimed in claim 1 , in which the cubic boron nitride grains have a mean size of 0.1 to 10 microns.

8. Composite material as claimed in claim 1 , in which an area distribution of the cubic boron nitride grains as viewed on a surface of the composite material has at least two modes.

9. A method of using the composite material as claimed in claim 1 , the method including:
providing a machine tool comprising a cutting edge comprising the composite material;
using the machine tool to machine a work-piece comprising ferrous material in interrupted mode, in which
the work-piece is configured such that a continuous engagement length is 30 to 50 per cent of a distance traversed between the cutting edge and the surface of the work-piece during the machining operation.

10. The method as claimed in claim 9 , in which the work-piece is configured such that at least a part of the work-piece presents an engagement angle to the cutting tool, the engagement angle being 30 to 90 degrees.

11. The method as claimed in claim 9 in which the work-piece comprises steel, cast iron or super-alloy material.

12. The method as claimed in claim 9 , in which the work-piece is suitable for the manufacture of a brake disc, and the method includes machining the work-piece to make a brake disc.

13. A machine tool suitable for machining ferrous work-piece in interrupted mode, comprising composite material as claimed in claim 1 , in which a cutting edge, a rake face and a flank face comprise the composite material.

Assignees

• Element Six Uk Ltd
• Element Six Abrasives Sa

Inventors

• Can Antionette
• Motchelaho Anne Myriam Megne
• Ozbayraktar Mehmet Serdar

Classifications

• C04B2235/428

  Silicon · CPC title

• C04B35/62635

  Mixing details · CPC title

• C04B2235/404

  Refractory metals · CPC title

• C04B35/6261

  Milling · CPC title

• C04B2235/5436

  micrometer sized, i.e. from 1 to 100 micron · CPC title