US4844988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamond composite and method for producing the same
Assignee: Ishizuka Research Institute Ltd
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Filing: 1987-12-22
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Granted: 1989-07-04
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Expires: 2007-12-22
Abstract
Abstract A diamond composite combined with a cobalt-containing substrate, comprising: a sintered mass of diamond, in which practically all the diamond particles are joined immediately with adjacent particles, a mass of cobalt-containing carbide, said latter mass being larger than the former and said first and latter masses being of a same cross section at the opposed ends, and an intermediate layer of a solid material which consists of Mo, Co and C with a minor proportion of inevitable impurities and which comprises a molybdenum carbide exhibiting a melting point within 200 degrees C. of that of the first said carbide material, said layer intervening between the masses and having a total radial cross sectional area of at least 80% but not greater than 97% of that of the diamond mass and carbide masses at the joint and a thickness of, at least, 25 microns over the whole cross sectional area and method for producing the same.
Inventors
- 👤 Hiroshi Ishizuka
- 👤 Satoshi Hayakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:13
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; C; C22; C22C; C22C19/00; C22C19/07; C22C26/00; C22C29/00; C22C29/02; C22C29/06; C22C29/08; B22F5/00; B22F2005/001; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056; Y10T428/12493; Y10T428/12535; Y10T428/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
A diamond composite combined with a cobalt-containing substrate, comprising: a sintered mass of diamond, in which practically all the diamond particles are joined immediately with adjacent particles, a mass of cobalt-containing carbide, said latter mass being larger than the former and said first and latter masses being of a same cross section at the opposed ends, and an intermediate layer of a solid material which consists of Mo, Co and C with a minor proportion of inevitable impurities and which comprises a molybdenum carbide exhibiting a melting point within 200 degrees C. of that of the first said carbide material, said layer intervening between the masses and having a total radial cross sectional area of at least 80% but not greater than 97% of that of the diamond mass and carbide masses at the joint and a thickness of, at least, 25 microns over the whole cross sectional area.
Claim 2
Dependent Claim
149 words
A diamond composite combined with a cobalt-containing substrate, comprising: a sintered mass of diamond, in which practically all the diamond particles are joined immediately with adjacent particles, a mass of cobalt-containing carbide, said latter mass being larger than the former and said first and latter masses being of a same cross section at the opposed ends, and an intermediate layer of a solid material which consists of Mo, Co and C with a minor proportion of inevitable impurities and which comprises a molybdenum carbide exhibiting a melting point within 200 degrees C. of that of the first said carbide material, said layer intervening between the masses and having a total radial cross sectional area of at least 80% but not greater than 97% of that of the diamond mass and carbide masses at the joint and a thickness of, at least, 25 microns over the whole cross sectional area.
Claim 3
Dependent Claim
16 words
A composite as claimed in claim 1, in which said intermediate layer material comprises metallic molybdenum.
Claim 4
Dependent Claim
19 words
A composite as claimed in claim 1, in which said intermediate layer thickness is not greater than 250 microns.
Claim 5
Independent Claim
183 words
A method for producing a diamond compact, comprising placing a loose mass of diamond particles in close contact with- but separated by a sheet of molybdenous material from a substrate block of cobalt-containing carbide material, said block having a sectional area substantially identical to- and a volume greater than said mass, said sheet having an effective sectional area 80 to 97% as wide as said masses at the opposed ends and a thickness of, at least, 20 microns over said area, heating the whole to a temperature high enough to yield a cobalt-based melt within said carbide material, allowing a limited mass of the melt, regulated by the sheet, to pass and infiltrate the diamond particles, thus initiating an interjoining of the diamond particles and a joining of the particles as a whole with the carbide material, converting partly the molybdenum sheet to a molybdenum carbide of a melting point within 200 deg. C. of that of the first said carbide material, while maintaining a combined pressure-temperature condition within the thermodynamic stability region for diamond, and recovering an integrated composite product thus produced.
Claim 6
Independent Claim
183 words
A method for producing a diamond compact, comprising placing a loose mass of diamond particles in close contact with- but separated by a sheet of molybdenous material from a substrate block of cobalt-containing carbide material, said block having a sectional area substantially identical to- and a volume greater than said mass, said sheet having an effective sectional area 80 to 97% as wide as said masses at the opposed ends and a thickness of, at least, 20 microns over said area, heating the whole to a temperature high enough to yield a cobalt-based melt within said carbide material, allowing a limited mass of the melt, regulated by the sheet, to pass and infiltrate the diamond particles, thus initiating an interjoining of the diamond particles and a joining of the particles as a whole with the carbide material, converting partly the molybdenum sheet to a molybdenum carbide of a melting point within 200 deg. C. of that of the first said carbide material, while maintaining a combined pressure-temperature condition within the thermodynamic stability region for diamond, and recovering an integrated composite product thus produced.
Claim 7
Dependent Claim
28 words
The method as claimed in claim 4, in which said sheet, prior to the application of the pressure and temperature, has a thickness no greater than 200 microns.
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) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |