Patent US4738689A successfully refreshed from Google Patents.
US4738689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated oxidation-resistant porous abrasive compact and method for making same
Assignee: Diamond Innovations Inc
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Filing: 1986-10-16
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Granted: 1988-04-19
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Expires: 2006-10-16
Abstract
Abstract Disclosed is an improved polycrystalline compact of self-bonded diamond particles having a network of interconnected empty pores dispersed throughout. The improved porous polycrystalline diamond compact possesses enhanced oxidation resistance and comprises all of the exterior surfaces of the porous compact being enveloped with a continuous coating which is effective under metal bond fabrication conditions so that oxidation of the diamond in the compact does not exceed a threshold level whereat loss of diamond properties of the compact occurs. Metal bond fabrication conditions comprehend an atmosphere containing oxygen or water vapor. Metal coatings are preferred, especially in coating thicknesses in excess of about 8 microns, and applied by a chemical vapor deposition process.
Inventors
- 👤 Paul D. Gigl
- 👤 Bonnie M. Hammersley
- 👤 David E. Slutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:27
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B24; B24D; B24D3/00; B24D3/005; B24D3/008; B24D3/02; B24D3/04; B24D3/06; B24D3/10; B24D3/34; B24D3/346; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; C09; C09K; C09K3/00; C09K3/14; C22; C22C; C22C26/00; C23; C23C; C23C16/00; C23C16/06; C23C16/22; C23C16/30; C23C16/32; C23C16/34
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
89 words
In a tool component polycrystalline compact of self-bonded diamond particles having a network of interconnected empty pores dispersed throughout the compact, the improvement for enhancing oxidation resistance of said porous compact which comprises all of the exterior surfaces of said compact being enveloped with a continuous coating which is effective under tool metal bond fabrication conditions in the presence of oxygen or water vapor so that oxidation of diamond in said compact does not exceed that of a single crystal diamond of comparable weight processed under said fabrication conditions.
Claim 2
Dependent Claim
89 words
In a tool component polycrystalline compact of self-bonded diamond particles having a network of interconnected empty pores dispersed throughout the compact, the improvement for enhancing oxidation resistance of said porous compact which comprises all of the exterior surfaces of said compact being enveloped with a continuous coating which is effective under tool metal bond fabrication conditions in the presence of oxygen or water vapor so that oxidation of diamond in said compact does not exceed that of a single crystal diamond of comparable weight processed under said fabrication conditions.
Claim 3
Dependent Claim
16 words
The compact of claim 1 wherein said coating is at least about 8 microns in thickness.
Claim 4
Dependent Claim
10 words
The compact of claim 1 wherein said coating is metal.
Claim 5
Dependent Claim
16 words
The compact of claim 3 wherein said coating is at least about 8 microns in thickness.
Claim 6
Dependent Claim
17 words
The compact of claim 4 wherein the coating ranges in thickness from about 8 to 150 microns.
Claim 7
Dependent Claim
25 words
The compact of claim 3 wherein said metal coating is selected from the group consisting of nickel, copper, titanium, iron, cobalt, chromium, tantalum, mixtures thereof.
Claim 8
Dependent Claim
15 words
The compact of claim 6 wherein said metal coating is titanium nitride or titanium carbide.
Claim 9
Dependent Claim
18 words
The compact of claim 1 wherein said continuous coating comprises successive layers of the same or different coating.
Claim 10
Independent Claim
62 words
A method the improvement comprising enveloping all of the exterior surfaces of said porous polycrystalline compact with a continuous coating which is effective under tool metal bond fabrication conditions in the presence of oxygen or water vapor so that oxidation of diamond in said compact does not exceed that of a single crystal diamond of comparable weight processed under said fabrication conditions.
Claim 11
Independent Claim
62 words
A method the improvement comprising enveloping all of the exterior surfaces of said porous polycrystalline compact with a continuous coating which is effective under tool metal bond fabrication conditions in the presence of oxygen or water vapor so that oxidation of diamond in said compact does not exceed that of a single crystal diamond of comparable weight processed under said fabrication conditions.
Claim 12
Dependent Claim
23 words
The method of claim 9 wherein said compact is enveloped with a continuous coating which is at least about 8 microns in thickness.
Claim 13
Dependent Claim
10 words
The method of claim 9 wherein said coating is metal.
Claim 14
Dependent Claim
16 words
The method of claim 11 wherein said coating is at least about 8 microns in thickness.
Claim 15
Dependent Claim
17 words
The method of claim 12 wherein said coating ranges in thickness from about 8 to 150 microns.
Claim 16
Dependent Claim
24 words
The method of claim 11 wherein said compact is enveloped with a coating comprising nickel, copper, titanium, iron, cobalt, chromium, tantalum, and alloys thereof.
Claim 17
Dependent Claim
27 words
The method of claim 14 wherein said compact is enveloped with a coating comprising titanium carbide or titanium nitride, and then is overcoated with a nickel coating.
Claim 18
Dependent Claim
12 words
The method of claim 11 wherein said enveloping comprises chemical vapor deposition.
Claim 19
Dependent Claim
19 words
The method of claim 16 wherein said chemical vapor deposition enveloped compact then is electrolytically coated with a metal.
Claim 20
Dependent Claim
75 words
In a method the improvement in enhancing oxidation resistance of said porous compact under metal bond fabrication conditions in the presence of oxygen and water vapor, which comprises enveloping all of the exterior surfaces of said porous compact with a continuous coating which is effective under said tool metal bond fabrication conditions so that oxidation of diamond in said compact does not exceed a threshold level whereat loss of diamond properties of said compact occurs.
Claim 21
Dependent Claim
75 words
In a method the improvement in enhancing oxidation resistance of said porous compact under metal bond fabrication conditions in the presence of oxygen and water vapor, which comprises enveloping all of the exterior surfaces of said porous compact with a continuous coating which is effective under said tool metal bond fabrication conditions so that oxidation of diamond in said compact does not exceed a threshold level whereat loss of diamond properties of said compact occurs.
Claim 22
Dependent Claim
14 words
The method of claim 18 wherein said coating on said polycrystalline compact is metal.
Claim 23
Dependent Claim
16 words
The method of claim 18 wherein said coating is at least about 8 microns in thickness.
Claim 24
Dependent Claim
27 words
The method of claim 19 wherein said metal comprises nickel, copper, titanium, iron, cobalt, chromium, tantalum, tungsten, niobium, zirconium, vanadium, molybdenum, and alloys, compounds, and mixtures thereof.
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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) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |