US4802895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite diamond abrasive compact
Assignee: Individual
•
Filing: 1987-07-07
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Granted: 1989-02-07
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Expires: 2007-07-07
Abstract
Abstract A composite diamond abrasive compact is produced from fine diamond particles in the conventional manner except that a thin layer of fine carbide particles is placed between the diamond particles and the cemented carbide support. The provision of the thin layer of carbide particles reduces the incidence of the formation of imperfect sinter areas in the compact.
Inventors
- 👤 Richard P. Burnand
- 👤 Kenneth A. MacKenzie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:33
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/06; B01J3/062; B22; B22F; B22F7/00; B22F7/06; B24; B24D; B24D3/00; B24D3/02; B24D3/04; B24D3/06; B24D3/10; C; C01; C01B; C01B32/00; C01B32/90; C22; C22C; C22C19/00; C22C26/00; C22C29/00; C22C29/02; C22C29/06; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/062; B01J2203/065; B01J2203/0655; B01J2203/0675; B01J2203/0685
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
A metohd includes the steps of: (a) providing a reaction capsule for a high temperature/high pressure apparatus; (b) loading the reaction capsule by placing therein a cemented carbide body, a thin layer of "fine" carbide powder of average particle size less than 2 microns on a surface of the carbide body, and a mass of "fine" diamond particles of average particle size less than 20 microns on the layer of carbide powder; (c) placing the loaded reaction capsule in the reaction zone of the high temperature/high pressure apparatus; (d) subjecting the contents of the reaction capsule to elevated conditions of temperature and pressure suitable to form a composite diamond abrasive compact; and (e) recovering the composite diamond abrasive compact from the reaction capsule.
Claim 2
Dependent Claim
123 words
A metohd includes the steps of: (a) providing a reaction capsule for a high temperature/high pressure apparatus; (b) loading the reaction capsule by placing therein a cemented carbide body, a thin layer of "fine" carbide powder of average particle size less than 2 microns on a surface of the carbide body, and a mass of "fine" diamond particles of average particle size less than 20 microns on the layer of carbide powder; (c) placing the loaded reaction capsule in the reaction zone of the high temperature/high pressure apparatus; (d) subjecting the contents of the reaction capsule to elevated conditions of temperature and pressure suitable to form a composite diamond abrasive compact; and (e) recovering the composite diamond abrasive compact from the reaction capsule.
Claim 3
Dependent Claim
20 words
A method according to claim 1 wherein the diamond particles have an average particle size of less than 5 microns.
Claim 4
Dependent Claim
23 words
A method according to claim 1 wherein the fine carbide powder has an average particle size in the range 0.5 to 1 micron.
Claim 5
Dependent Claim
28 words
A method according to claim 1 wherein the fine diamond particles are mixed with up to 5% by mass of a powder selected from cobalt, nickel and iron.
Claim 6
Dependent Claim
11 words
A method according to claim 4 wherein the metal is cobalt.
References Cited (Backward Citations)
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US4311490A
Cited
US4686080A
Cited
US4525178A
Cited
US4604106A
Cited
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US4527998A
Cited
US4662896A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |