US4104441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycrystalline diamond member and method of preparing same
Assignee: Institut Khimicheskoi Fiziki Akademii Nauk
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Filing: 1976-05-19
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Granted: 1978-08-01
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Expires: 1996-05-19
Abstract
Abstract A method of preparing a polycrystalline diamond member comprising sintering diamond particles having deposited thereon, not only diamond coating, but also diamond-graphite coating In the epitaxial method of coating according to the invention, diamond particles may be the finest ones of a size smaller than one micron. The resulting compact member is characterized in the absence of marked graphite inclusions, and diamond cleavage between the particles results in a considerable improvement of the strength of the compact member.
Inventors
- 👤 Dmitry Valerianovich Fedoseev
- 👤 Boris Vladimirovich Deryagin
- 👤 Valentin Nikolaevich Bakul
- 👤 Alexei Iosifovich Prikhna
- 👤 Valentin Pavlovich Varnin
- 👤 Stanislav Pavlovich Vnukov
- 👤 Valentin Korneevich Gerasimenko
- 👤 Jury Ivanovich Nikitin
- 👤 Nekhemyan Veniaminovich Tsypin
- 👤 Anatoly Vasilievich Hochko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:31
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/06; B01J3/062; B24; B24D; B24D3/00; B24D3/02; B24D3/04; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/062; B01J2203/065; B01J2203/0655; B01J2203/0675; B01J2203/0685; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995; Y10T428/30
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
134 words
A method of preparing a polycrystalline diamond member comprising: using diamond particles of any size including those smaller than one micron, said particles having substantially identical size; epitaxially coating said particles in a flow of a carbonaceous medium to deposit both diamond and diamond-graphite coating on said particles; interrupting said coating at a predetermined moment prior to the formation of a pure graphite layer on the particles; bringing said particles into mechanical contact with one another and sintering them under a pressure of at least 40 kbar and at a temperature of at least 1000° C for a time sufficient for effecting phase conversions of the diamond-graphite material in the zones of contact of the diamond-graphite coatings of neighboring particles into diamond so as to strongly bind all particles into a single compact body.
Claim 2
Independent Claim
134 words
A method of preparing a polycrystalline diamond member comprising: using diamond particles of any size including those smaller than one micron, said particles having substantially identical size; epitaxially coating said particles in a flow of a carbonaceous medium to deposit both diamond and diamond-graphite coating on said particles; interrupting said coating at a predetermined moment prior to the formation of a pure graphite layer on the particles; bringing said particles into mechanical contact with one another and sintering them under a pressure of at least 40 kbar and at a temperature of at least 1000° C for a time sufficient for effecting phase conversions of the diamond-graphite material in the zones of contact of the diamond-graphite coatings of neighboring particles into diamond so as to strongly bind all particles into a single compact body.
Claim 3
Dependent Claim
54 words
The polycrystalline diamond member prepared as claimed in claim 1, containing a plurality of diamond particles bound into a single compact body, wherein the binder consists of diamond zones substantially free from graphite which are formed as a result of phase conversion in the zones of contact of diamond-graphite coatings of various neighbouring particles.
References Cited (Backward Citations)
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US3141746A
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US3399254A
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US3630678A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-31 | 1982-01-30 | 1982-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-31 | 1986-01-30 | 1986-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-31 | 1990-01-30 | 1990-08-01 | $7700.00 | Window Closed / Lapsed |