# US 10,442,007 B2 · Composite polycrystal

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- Number: US 10,442,007 B2
- Document ID: US10442007B2
- Status: Granted
- Kind: B2
- Application number: 15/534,314
- Filed: 2016-10-07
- Published: 2018-01-04
- Granted: 2019-10-15
- Earliest claimed: 2015-10-30
- Assignees: Sumitomo Electric Industries, Ltd.
- Applicants: Sumitomo Electric Industries, Ltd.
- Inventors: Hitoshi Sumiya; Takeshi Sato
- Web page: https://patentgrep.com/patent/US10442007B2

## CPC

- B23B 27/20: with diamond bits {or cutting inserts}
- B01J 3/062: {characterised by the composition of the materials to be processed}
- C04B 35/52: based on carbon, e.g. graphite
- C04B 35/528: obtained from carbonaceous particles with or without other non-organic components
- C04B 35/645: Pressure sintering
- B01J 2203/062: Diamond
- B01J 2203/0655: Diamond
- B01J 2203/0685: Crystal sintering
- C04B 2235/425: Graphite
- C04B 2235/427: Diamond
- C04B 2235/5436: micrometer sized, i.e. from 1 to 100 micron
- C04B 2235/5445: submicron sized, i.e. from 0,1 to 1 micron
- C04B 2235/608: Green bodies or pre-forms with well-defined density
- C04B 2235/72: Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
- C04B 2235/785: Submicron sized grains, i.e. from 0,1 to 1 micron
- C04B 2235/80: Phases present in the sintered or melt-cast ceramic products other than the main phase
- B23B: TURNING; BORING (arrangements for copying or controlling B23Q)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- 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

## Abstract

A composite polycrystal contains polycrystalline diamond formed of diamond grains that are directly bonded mutually, and compressed graphite dispersed in the polycrystalline diamond.

## Claims

### Claim 1

A composite polycrystal comprising: polycrystalline diamond formed of diamond grains that are directly bonded mutually, and compressed graphite dispersed in said polycrystalline diamond, wherein
said compressed graphite has an interplanar spacing in a C axis smaller than that of normal graphite, and
said compressed graphite has a percentage in said composite polycrystal in whole of greater than or equal to 0.5% and less than or equal to 35% as calculated from 100×Ig (002)/{Id (111)+Ig (002)} wherein Ig (002) is an area of an X-ray diffraction peak derived from (002) surface of said compressed graphite, and Id (111) is an area of an X-ray diffraction peak derived from (111) surface of said polycrystalline diamond in an X-ray diffraction profile of said composite polycrystal.

### Claim 2 (depends on 1)

The composite polycrystal according to claim 1, wherein said polycrystalline diamond has a phase that is continuous three-dimensionally.

### Claim 3 (depends on 1)

The composite polycrystal according to claim 1, wherein said diamond grains forming said polycrystalline diamond have a mean grain size of greater than or equal to 10 nm and less than or equal to 1000 nm.

### Claim 4 (depends on 1)

The composite polycrystal according to claim 1, wherein said compressed graphite has a mean grain size of greater than or equal to 10 nm and less than or equal to 2000 nm.

### Claim 5 (depends on 1)

The composite polycrystal according to claim 1, having a Knoop hardness of greater than or equal to 50 GPa.

### Claim 6

A composite polycrystal comprising: polycrystalline diamond formed of diamond grains that are directly bonded mutually, and compressed graphite dispersed in said polycrystalline diamond, wherein
said polycrystalline diamond has a phase that is continuous three-dimensionally;
said diamond grains forming said polycrystalline diamond have a mean grain size of greater than or equal to 10 nm and less than or equal to 1000 nm;
said compressed graphite has an interplanar spacing in a C axis smaller than that of normal graphite;
said compressed graphite has a mean grain size of greater than or equal to 10 nm and less than or equal to 2000 nm;
said compressed graphite has a percentage in said composite polycrystal in whole of greater than or equal to 0.5% and less than or equal to 35% as calculated from 100×Ig (002)/{Id (111)+Ig (002)} wherein Ig (002) is an area of an X-ray diffraction peak derived from (002) surface of said compressed graphite, and Id (111) is an area of an X-ray diffraction peak derived from (111) surface of said polycrystalline diamond in an X-ray diffraction profile of said composite polycrystal; and
the composite polycrystal has a Knoop hardness of greater than or equal to 50 GPa.