US4377565A
Expired / Lapsed
US
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Process for producing diamond powder by shock compression
Assignee: National Institute for Materials Science
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Filing: 1981-12-18
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Granted: 1983-03-22
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Expires: 2001-12-18
Abstract
Abstract A diamond powder is produced by a shock compressing method using a carbon precursor obtained by an organic compound such as furan resin, its derivative, a thermosettable resin, as a carbon source.
Inventors
- 👤 Nobuo Setaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:15
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/06; B01J3/08; B01J2203/00; B01J2203/06; B01J2203/065; B01J2203/0655
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
64 words
In a process for producing a diamond powder by a shock compressing method, an improvement characterized by applying the shock compression to a carbon precursor obtained by heating at about 400° to 500° C. and thereafter pulverizing an organic compound which is not substantially melted by heating at 400° to 1000° C. and which is a thermosettable resin or cellulose, as a carbon source.
Claim 2
Dependent Claim
64 words
In a process for producing a diamond powder by a shock compressing method, an improvement characterized by applying the shock compression to a carbon precursor obtained by heating at about 400° to 500° C. and thereafter pulverizing an organic compound which is not substantially melted by heating at 400° to 1000° C. and which is a thermosettable resin or cellulose, as a carbon source.
Claim 3
Dependent Claim
16 words
The process according to claim 1 wherein said carbon precursor is obtained from a thermosettable resin.
Claim 4
Dependent Claim
62 words
The process according to claim 1 wherein a heat conductive metal powder is admixed with said carbon precursor at a ratio of more than 80 wt.% of said metal powder to said carbon precursor, and said mixture is molded or compressed to porosity of less than 30% and a shock compression of 40 to 150 GPa is applied to the molded product.
Claim 5
Dependent Claim
16 words
The process according to claim 1 wherein an explosion wave is utilized for said shock compression.
Claim 6
Dependent Claim
16 words
The process according to claim 2 wherein said carbon precursor is obtained from a furan resin.
Claim 7
Dependent Claim
14 words
The process according to claim 1 wherein said carbon precursor is obtained from cellulose.
Claim 8
Dependent Claim
23 words
The process according to claim 2 wherein said carbon precursor is obtained from a mixture of furan resin with a phenol formaldehyde resin.
Claim 9
Dependent Claim
114 words
In a process for producing a diamond powder by a shock compressing method, an improvement characterized by applying the shock compression to a carbon precursor obtained by heating in a nitrogen atmosphere at about 400° to 500° C. and thereafter pulverizing a furan resin obtained by thermosetting furfuryl alcohol in the presence of an organic acid, the carbon precursor being admixed with conductive metal powder at a ratio of more than 80 wt.% of said metal powder to said carbon precursor, and said mixture is molded and compressed to a porosity of less than 30% and a shock compression of 40 to 150 GPa is applied to the molded product by an explosion wave.
Claim 10
Dependent Claim
114 words
In a process for producing a diamond powder by a shock compressing method, an improvement characterized by applying the shock compression to a carbon precursor obtained by heating in a nitrogen atmosphere at about 400° to 500° C. and thereafter pulverizing a furan resin obtained by thermosetting furfuryl alcohol in the presence of an organic acid, the carbon precursor being admixed with conductive metal powder at a ratio of more than 80 wt.% of said metal powder to said carbon precursor, and said mixture is molded and compressed to a porosity of less than 30% and a shock compression of 40 to 150 GPa is applied to the molded product by an explosion wave.
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) | 1986-03-21 | 1986-09-20 | 1987-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-21 | 1990-09-20 | 1991-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-21 | 1994-09-20 | 1995-03-22 | $7700.00 | Window Closed / Lapsed |