US4164527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making superhard articles
Assignee: Individual
•
Filing: 1976-08-16
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Granted: 1979-08-14
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Expires: 1996-08-16
Abstract
Abstract The method of preparing superhard articles consists of placing a mixture of powdered hard-alloy matrix material and diamond grains into a hard-alloy envelope formed from a hard-alloy material, preferably of exactly the same composition as the hard-alloy matrix material of the mixture, with the thickness of the hard-alloy envelope over the entire area thereof exceeding by at least 3-4 times the maximum space between any two adjacent diamond grains within the mixture. The mixture in the envelope is then subjected to sintering in a free condition thereof, without any external mechanical loads being applied thereto.
Inventors
- 👤 Valentin N. Bakul
- 👤 Ivan F. Vovchanovsky
- 👤 Nekhemian V. Tsypin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:12
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/05; C22C1/051; B; B22; B22F; B22F3/00; B22F3/12; B22F3/1208; B22F3/1216; B22F7/00; B22F7/06; B22F2998/00; B22F2999/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
113 words
A method of making a superhard article comprising the steps of: preparing a briquette from a homogeneous mixture of a powdered hard-alloy matrix material and diamond grains uniformly distributed throughout the matrix material; providing the briquette with an external envelope formed from the same powdered hard-alloy matrix material of the briquette and having a thickness over the entire area thereof exceeding by at least 3-4 times the maximum space between any two adjacent diamond grains within the briquette; and sintering the briquette in the envelope in a free condition without any external mechanical loads being applied to the briquette, whereby the envelope having a higher contraction coefficient than the briquette compresses the briquette.
Claim 2
Independent Claim
113 words
A method of making a superhard article comprising the steps of: preparing a briquette from a homogeneous mixture of a powdered hard-alloy matrix material and diamond grains uniformly distributed throughout the matrix material; providing the briquette with an external envelope formed from the same powdered hard-alloy matrix material of the briquette and having a thickness over the entire area thereof exceeding by at least 3-4 times the maximum space between any two adjacent diamond grains within the briquette; and sintering the briquette in the envelope in a free condition without any external mechanical loads being applied to the briquette, whereby the envelope having a higher contraction coefficient than the briquette compresses the briquette.
Claim 3
Dependent Claim
56 words
The method according to claim 1, wherein the step of providing the briquette with the external envelope comprises: forming a shell made of the hard-alloy matrix material; filling the shell with the briquette; and covering the briquette with a top layer of the hard-alloy matrix material to complete thereby a hard-alloy envelope all around the briquette
Claim 4
Dependent Claim
17 words
The method according to claim 1 wherein the hard-alloy matrix material consists of tungsten carbide and cobalt.
Claim 5
Dependent Claim
24 words
The method according to claim 1 wherein the briquette consists of 80% of the powdered hard-alloy matrix material and 20% of the diamond grains.
References Cited (Backward Citations)
US3720740A
Cited
US3871840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-13 | 1983-02-12 | 1983-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-13 | 1987-02-12 | 1987-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-13 | 1991-02-12 | 1991-08-14 | $7700.00 | Window Closed / Lapsed |