Patent US2911810A successfully refreshed from Google Patents.
US4875907A
Expired / Lapsed
US
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Thermally stable diamond abrasive compact body
Assignee: Individual
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Filing: 1987-09-23
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Granted: 1989-10-24
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Expires: 2007-09-23
Abstract
Abstract A thermally stable diamond compact is bonded to a cemented carbide substrate through a nickel bonding layer. Bonding takes place under elevated conditions of temperature and pressure where the temperature is at least 1000° C. and the pressure is at least 30 kilobars.
Inventors
- 👤 Cornelius Phaal
- 👤 Richard P. Burnand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:02
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; B01; B01J; B01J3/00; B01J3/06; B01J3/062; B24; B24D; B24D18/00; B24D18/0009; B24D3/00; B24D3/001; B24D3/007; B24D3/02; B24D3/04; B24D3/06; B24D3/10; C; C22; C22C; C22C26/00; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/062; B01J2203/065; B01J2203/0655; B01J2203/0675; B01J2203/0685
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
139 words
A method of making a composite diamond abrasive compact comprising a thermally stable diamond compact bonded to a cemented carbide substrate including the steps of forming an unbonded assembly comprising a thermally stable diamond compact comprising a mass of diamond particles containing substantial diamond-to-diamond bonding to form a coherent, skeletal mass and a second phase uniformly distributed through the diamond mass, a cemented carbide substrate and a layer of nickel or a nickel-rich alloy between the compact and substrate, placing the unbonded assembly in the reaction zone of a high pressure/high temperature apparatus, subjecting the unbonded assembly to a temperature of at least 1000° C. and simultaneously a pressure of at least 30 kilobars for a time sufficient to cause bonding to occur between the compact and substrate and removing the composite diamond abrasive compact from the reaction zone.
Claim 2
Independent Claim
139 words
A method of making a composite diamond abrasive compact comprising a thermally stable diamond compact bonded to a cemented carbide substrate including the steps of forming an unbonded assembly comprising a thermally stable diamond compact comprising a mass of diamond particles containing substantial diamond-to-diamond bonding to form a coherent, skeletal mass and a second phase uniformly distributed through the diamond mass, a cemented carbide substrate and a layer of nickel or a nickel-rich alloy between the compact and substrate, placing the unbonded assembly in the reaction zone of a high pressure/high temperature apparatus, subjecting the unbonded assembly to a temperature of at least 1000° C. and simultaneously a pressure of at least 30 kilobars for a time sufficient to cause bonding to occur between the compact and substrate and removing the composite diamond abrasive compact from the reaction zone.
Claim 3
Dependent Claim
24 words
A method according to claim 1 wherein the temperature applied does not exceed 2000° C. and the pressure applied does not exceed 55 kilobars.
Claim 4
Dependent Claim
27 words
A method according to claim 1 wherein the alloy contains nickel and up to 10% by weight of a metal selected from titanium, zirconium, tantalum and molybdenum.
Claim 5
Dependent Claim
35 words
A method of claim 1 wherein nickel from the layer infiltrates into the compact and the conditions of temperature and pressure applied are such that the penetration does not exceed a depth of 600 microns.
References Cited (Backward Citations)
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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) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |