US5002828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite diamond abrasive, process for preparation, and drilling or machining which are equipped with it
Assignee: Industrielle de Combustible Nucleaire Ste
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Filing: 1988-11-16
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Granted: 1991-03-26
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Expires: 2008-11-16
Abstract
Abstract An abrasive is provided having an active phase comprising a sintered product comprising diamond grains, each grain being linked directly to its neighbors by bridging to exhibit a polycrystalline structure, and a support consisting essentially of tungsten carbide. The tungsten carbide support comprises a chromium binder phase including 6 to 15% of carbide. The relative proportions by weight of nickel and chromium of the binder phase vary from 60 to 90% to 40 to 100%, respectively. The abrasive is made by placing a layer of diamond grains into a cupel, covering this layer with a tungsten carbide layer including a nickel-chromium mixture to provide the support, subjecting the stack thus produced to a temperature and a pressure sufficient to cause sintering in the plastic phase of the diamond grains and to assure the binding of the compact thus obtained on the support. Drilling and machine tools can be equipped with the abrasive product of the invention.
Inventors
- 👤 Jean-Michel Cerceau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:24
CPC Classifications
B; B24; B24D; B24D3/00; B24D3/001; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/932; Y10S76/00; Y10S76/12; Y10T; Y10T407/00; Y10T407/27; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12576; Y10T428/30
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
71 words
A composite diamond abrasive comprising an active phase comprising at least 80% by volume of a mass of sintered diamond grains, each of said grains being linked directly to its neighbors by bridging to exhibit a polycrystalline structure, and a support consisting essentially of tungsten carbide with a nickel-chromium binder phase, the relative proportions of nickel and chromium in said binder phase varying from 60 to 90% to 40 to 10%.
Claim 2
Dependent Claim
71 words
A composite diamond abrasive comprising an active phase comprising at least 80% by volume of a mass of sintered diamond grains, each of said grains being linked directly to its neighbors by bridging to exhibit a polycrystalline structure, and a support consisting essentially of tungsten carbide with a nickel-chromium binder phase, the relative proportions of nickel and chromium in said binder phase varying from 60 to 90% to 40 to 10%.
Claim 3
Dependent Claim
18 words
The composite according to claim l wherein said binder phase comprises 6 to 15% by volume of carbide.
Claim 4
Dependent Claim
16 words
The composite according to claim 3 wherein said binder phase comprises 10% by volume of carbide.
Claim 5
Dependent Claim
21 words
The composite according to claim 1 further including a catalyst binder comprising nickel-chromium coming from the binder phase of the support.
Claim 6
Independent Claim
107 words
A method for producing a thermostable diamond abrasive comprising: placing a layer of diamond grains into a cupel to form an active layer comprising at least 80% by volume of diamond; covering said layer of diamond grains with a layer of a mixture of tungsten carbide and nickel-chromium wherein the relative proportions by weight of nickel and chromium are from 60 to 90% to 40 to 10%, respectively, has been inserted said tungsten carbide and nickel-chromium mixture forming a support for said diamond grains; subjecting the layers to a temperature and pressure sufficient to sinter the diamond grains and bind the compact thus obtained onto the support.
Claim 7
Independent Claim
107 words
A method for producing a thermostable diamond abrasive comprising: placing a layer of diamond grains into a cupel to form an active layer comprising at least 80% by volume of diamond; covering said layer of diamond grains with a layer of a mixture of tungsten carbide and nickel-chromium wherein the relative proportions by weight of nickel and chromium are from 60 to 90% to 40 to 10%, respectively, has been inserted said tungsten carbide and nickel-chromium mixture forming a support for said diamond grains; subjecting the layers to a temperature and pressure sufficient to sinter the diamond grains and bind the compact thus obtained onto the support.
Claim 8
Dependent Claim
26 words
The process according to claim 5 wherein the support layer is sintered tungsten carbide containing from 6 to 15% by volume of a nickel-chromium binder phase.
Claim 9
Dependent Claim
25 words
The process according to claim 5 wherein the support layer is a tungsten carbide powder containing from 6 to 15% of a pulverulent nickel-chromium mixture.
Claim 10
Dependent Claim
21 words
The process according to claim 5 wherein from 5 to 15% of a nickel-chromium mixture is added to the diamond grains.
Claim 11
Dependent Claim
20 words
The process according to claim 5 wherein a layer of nickel-chromium alloy is placed in contact with said diamond grains.
Claim 12
Dependent Claim
26 words
The process according to claim 5 wherein an intermediate layer consisting exclusively of diamond and tungsten carbide is placed between the active phase and the support.
Claim 13
Dependent Claim
15 words
The process according to claim 10 wherein the intermediate layer further includes a nickel-chromium mixture.
Claim 14
Dependent Claim
50 words
A composite diamond abrasive made by the method of claim 5 and comprising an active phase comprising sintered diamond grains, each of said grains being linked directly to its neighbors by bridging to exhibit a polycrystalline structure, and a support consisting essentially of tungsten carbide with a nickel-chromium binder phase.
Claim 15
Dependent Claim
56 words
A method of producing a composite diamond abrasive according to claim 1, comprising forming an active phase comprising sintered diamond grains, each of said grains being linked directly to its neighbors by bridging to exhibit a polycrystalline structure, and forming adjacent said active phase a support consisting essentially of tungsten carbide with a nickel-chromium binder phase.
References Cited (Backward Citations)
GB1349385A
Cited
US3745623A
Cited
US3912500A
Cited
GB1489130A
Cited
US4224380A
Cited
US4259090A
Cited
US4370149A
Cited
US4311490A
Cited
US4505746A
Cited
US4798026A
Cited
US4875907A
Cited
US4824442A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-25 | 1994-09-24 | 1995-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-25 | 1998-09-24 | 1999-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-25 | 2002-09-24 | 2003-03-26 | $7700.00 | Window Closed / Lapsed |