Polycrystalline diamond includes cubic diamond and hexagonal diamond, and a ratio of X-ray diffraction peak intensity of a (100) plane of the hexagonal diamond to X-ray diffraction peak intensity for a (111) plane of cubic diamond is not lower than 0.01%. In addition, a present method of manufacturing polycrystalline diamond includes the steps of preparing a non-diamond carbon material having a degree of graphitization not higher than 0.58 and directly converting the non-diamond carbon material to cubic diamond and hexagonal diamond and sintering the non-diamond carbon material, without adding any of a sintering agent and a binder, under pressure and temperature conditions at which diamond is thermodynamically stable.

Claims

14 · 1 independent · depth 3

14 granted claims

›1.independentPolycrystalline diamond, comprising:ncubic diamond; andhexagonal diamond,a ratio of X-ray diffraction peak intensity of a (100) plane of said hexagona…+13

›2.↳ 1The polycrystalline diamond according to claim 1, having rupture strength in a temperature range not lower than 800° C. and not higher than 1200° C., …d2+1

›4.↳ 1The polycrystalline diamond according to claim 1, having hardness at 800° C., not lower than 80% of hardness at room temperature.d2

›5.↳ 1A scribe tool, comprising a tip end portion composed of the polycrystalline diamond according to claim 1,nsaid tip end portion having three or four po…d2

›6.↳ 1A scribing wheel, comprising a wheel composed of the polycrystalline diamond according to claim 1.d2

›7.↳ 1A dresser, comprising a tip end portion composed of the polycrystalline diamond according to claim 1.d2

›8.↳ 1A wire drawing die, comprising the polycrystalline diamond according to claim 1.d2

›9.↳ 1A nozzle, comprising an orifice composed of the polycrystalline diamond according to claim 1.d2

›10.↳ 1A grinding tool, comprising a grinding edge composed of the polycrystalline diamond according to claim 1.d2

›11.↳ 1A cutting tool, comprising a cutting edge composed of the polycrystalline diamond according to claim 1.d2

›12.↳ 1A rotary cutting tool, comprising a cutting edge composed of the polycrystalline diamond according to claim 1.d2

›13.↳ 1A wire guide, composed of the polycrystalline diamond according to claim 1.d2

›14.↳ 1A method of manufacturing polycrystalline diamond according to claim 1, comprising the steps of: preparing a non-diamond carbon material having a degr…d2

Classifications

22 codes

IPC · International Patent Classification

Section A — Human necessities

A62C31/02

Section B — Performing operations; transporting

B23F21/03
B23H7/00
B32B7/02
B24B21/18
B26D3/08
B26D11/00
B31B1/25
B01J3/06
B21C3/00

Section G — Physics

G11B5/64

USPC · US Patent Classification

423/446239/589451/443451/54883/879219/69.1272/46783/863428/336428/21683/886

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Pendency

2.8 y

1,035 days filing → grant

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after a restriction

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Examiner

Guinever Gregorio

art unit 1732 · TC 1700

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1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20120258035 A1	11 Oct 2012

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