Patent US3879901A successfully refreshed from Google Patents.
US3879901A
Expired / Lapsed
US
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Metal-coated diamonds in a metal alloy matrix
Assignee: De Beers Industrial Diamond Division Pty Ltd
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Filing: 1973-09-10
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Granted: 1975-04-29
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Expires: 1993-09-10
Abstract
Abstract A compact comprising substantially graphite-free diamond particles having a continuous coating of titanium or molybdenum held in a matrix into which the titanium or molybdenum can diffuse. The matrix may for example, be an alloy selected from the group of Fe/Ni, Ni/Co/Cr/Fe, Fe/Si and Ti/Si alloys. The invention also provides a method of making such a compact by mixing the desired metal powders in suitable proportions with the coated diamond particles and compacting the mixture under pressure and temperature conditions in the diamond stable zone.
Inventors
- 👤 Robert John Caveney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:57
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1436; C09K3/1445; B; B01; B01J; B01J3/00; B01J3/06; B01J3/062; C22; C22C; C22C26/00; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/062; B01J2203/065; B01J2203/0655; B01J2203/066; B01J2203/0675; B01J2203/0685
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
A COMPACT CONSISTING ESSENTIALLY OF SUBSTANTIALLY GRAPHITE-FREE DIAMOND PARTICLES HAVING A CONTINUOUS METAL COATING OF THICKNESS FROM 1,000 TO 2,000A CHEMICALLY BONDED THERETO AND HELD IN A MATRIX BY A DIFFUSION ALLOY OF THE METAL AND THE MATRIX AT THE METAL/MATRIX INTERFACE, THE METAL BEING SELECTED FROM THE GROUP CONSISTING OF TITANIUM AND MOLYBDENUM AND THE MATRIX BEING SELECTED FROM THE GROUP CONSISING OF FE/NI, NI/CO/CR/FE/ AND FE/SI ALLOYS AND WC BONDED WITH A TRANSITION METAL OF THE VIII GROUP, SAID COMPACT HAVING A GRINDING EFFECIENCY RATIO GREATER THAN 1.
Claim 2
Dependent Claim
90 words
A COMPACT CONSISTING ESSENTIALLY OF SUBSTANTIALLY GRAPHITE-FREE DIAMOND PARTICLES HAVING A CONTINUOUS METAL COATING OF THICKNESS FROM 1,000 TO 2,000A CHEMICALLY BONDED THERETO AND HELD IN A MATRIX BY A DIFFUSION ALLOY OF THE METAL AND THE MATRIX AT THE METAL/MATRIX INTERFACE, THE METAL BEING SELECTED FROM THE GROUP CONSISTING OF TITANIUM AND MOLYBDENUM AND THE MATRIX BEING SELECTED FROM THE GROUP CONSISING OF FE/NI, NI/CO/CR/FE/ AND FE/SI ALLOYS AND WC BONDED WITH A TRANSITION METAL OF THE VIII GROUP, SAID COMPACT HAVING A GRINDING EFFECIENCY RATIO GREATER THAN 1.
Claim 3
Dependent Claim
24 words
A compact according to claim 1, wherein the matrix is an Fe/Ni alloy the ratio of iron to nickel in the alloy being 12/5.
Claim 4
Dependent Claim
23 words
A compact according to claim 1, wherein the matrix is a Ni/Co/Cr/Fe alloy, the ratio of the metals in the alloy being 34/18/14/5.
Claim 5
Dependent Claim
26 words
A compact according to claim 1 wherein the matrix is an Fe/Si alloy the ratio of the iron to the silicon in the alloy being 63/2.
Claim 6
Dependent Claim
29 words
A compact according to claim 1 wherein the matrix is WC bonded with cobalt which is present in the amount of about 10 percent by weight of the WC.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |