US4036937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamond synthesis
Assignee: Individual
•
Filing: 1974-09-13
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Granted: 1977-07-19
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Expires: 1994-09-13
Abstract
Abstract The invention provides elongate synthetic RD diamond particles, each particle having a long axis and a short transverse axis, the ratio of the long axis to the short axis being at least 3 to 1. Each particle generally has a rib bed structure down its long axis, the ribs of the structure being traces of {111} crystallographic planes and the long axis providing a backbone for the structure and being in the direction <100> crystallographic direction. The invention further provides a resin bond grinding wheel in which these particles are radially oriented. The particles may be made by providing a body of solvent metal in contact with a body of carbonaceous material in a reaction zone, producing zones of the weakness in the carbonaceous body and subjecting the contents of the zone to conditions of pressure and temperature suitable for RD diamond growth so causing the solvent metal to penetrate the zones of weakness and produce the particles.
Inventors
- 👤 Alexander Rose Roy
- 👤 Anthony Bayliss Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:31
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/06; B01J3/062; C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/061; B01J2203/065; B01J2203/0655; B01J2203/0675; B01J2203/068
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
147 words
In a method of making RD diamond particles wherein a solvent metal is placed in contact with a carbonaceous material in a reaction zone and the contents of the reaction zone are subjected to elevated conditions of temperature and pressure to convert the carbonaceous material into diamond, the elevated conditions of temperature and pressure being maintained for a period suitable for RD diamond growth, the improvement comprising: providing the carbonaceous material in the form of a sleeve around a core of the solvent metal, the ratio of the width of the sleeve to the diameter of the core being in the range 1:20 to 1:5, whereby zones of weakness are produced in the sleeve and the solvent metal penetrates the zones of weakness when the contents of the reaction zone are subjected to the elevated conditions of temperature and pressure and elongate RD diamond particles are produced.
Claim 2
Dependent Claim
147 words
In a method of making RD diamond particles wherein a solvent metal is placed in contact with a carbonaceous material in a reaction zone and the contents of the reaction zone are subjected to elevated conditions of temperature and pressure to convert the carbonaceous material into diamond, the elevated conditions of temperature and pressure being maintained for a period suitable for RD diamond growth, the improvement comprising: providing the carbonaceous material in the form of a sleeve around a core of the solvent metal, the ratio of the width of the sleeve to the diameter of the core being in the range 1:20 to 1:5, whereby zones of weakness are produced in the sleeve and the solvent metal penetrates the zones of weakness when the contents of the reaction zone are subjected to the elevated conditions of temperature and pressure and elongate RD diamond particles are produced.
Claim 3
Dependent Claim
21 words
A method according to claim 1 wherein the width of the sleeve is about one tenth the diameter of the core.
Claim 4
Dependent Claim
12 words
A method according to claim 1 wherein the carbonaceous material is graphite.
Claim 5
Dependent Claim
17 words
A method according to claim 1 wherein the solvent metal is an alloy of manganese and cobalt.
Claim 6
Dependent Claim
29 words
A method according to claim 4 wherein the ratio of the manganese to the cobalt in the alloy is in the range 30:70 to 70:30 on a weight basis.
Claim 7
Dependent Claim
42 words
A method according to claim 1 wherein the elevated conditions of temperature and pressure are in the ranges 1300° C to 1600° C and 55 to 65 kilobars, respectively, and these conditions are maintained for a period of 4 to 10 minutes.
Claim 8
Dependent Claim
69 words
In a cabonaceous material-solvent metal assembly for insertion in the reaction zone of a high temperature-pressure apparatus for the conversion of the carbonaceous material into RD diamond particles, the improvement comprising: providing the carbonaceous material in the form of a sleeve around a core of the solvent metal, the ratio of the width of the sleeve to the diameter of the core being in the range 1:20 to 1:5.
Claim 9
Dependent Claim
69 words
In a cabonaceous material-solvent metal assembly for insertion in the reaction zone of a high temperature-pressure apparatus for the conversion of the carbonaceous material into RD diamond particles, the improvement comprising: providing the carbonaceous material in the form of a sleeve around a core of the solvent metal, the ratio of the width of the sleeve to the diameter of the core being in the range 1:20 to 1:5.
Claim 10
Dependent Claim
21 words
An assembly according to claim 7 wherein the width of the sleeve is about one tenth the diameter of the core.
Claim 11
Dependent Claim
12 words
An assembly according to claim 7 wherein the carbonaceous material is graphite.
Claim 12
Dependent Claim
17 words
An assembly according to claim 7 wherein the solvent metal is an alloy of manganese and cobalt.
Claim 13
Dependent Claim
29 words
An assembly according to claim 10 wherein the ratio of the manganese to the cobalt in the alloy is in the range 30:70 to 70:30 on a weight basis.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |