EP0264024A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Coated oxidation resistant porous abrasive compact and method for making same
Assignee: General Electric Co
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Filing: 1987-09-30
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Granted: —
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Expires: 2007-09-30
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 Donald Gigl
- 👤 Bonnie Mar Hammersley
- 👤 David Earl Slutz
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 08:46
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: 23
Claim 1
Independent Claim
96 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 comprising titanium nitride or titanium carbide, said coating being 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
96 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 comprising titanium nitride or titanium carbide, said coating being 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
20 words
The compact of claim 1 wherein said coating ranges in thickness from about 8 microns to 30 microns in thickness.
Claim 4
Dependent Claim
11 words
The compact of claim 1 wherein said coating comprises titanium carbide.
Claim 5
Dependent Claim
11 words
The compact of claim 1 wherein said coating comprises titanium nitride.
Claim 6
Dependent Claim
32 words
The compact of claim 1 which is further coated with a metal selected from the group consisting of nickel, copper, titanium, iron, cobalt, chromium, tantalum, tungsten, molybdenum, and alloys and mixtures thereof.
Claim 7
Dependent Claim
10 words
The compact of claim 5 wherein said metal comprises nickel.
Claim 8
Independent Claim
95 words
A method for improving the oxidation resistance of a tool component polycrystalline compact of self-bonded diamond particles having a network of interconnected empty pores dispersed throughout the compact, the improvement comprising forming a continuous coating by chemical vapor deposition, said coating enveloping all of the exterior surfaces of said porous polycrystalline compact and being effective under tool metal bond fabrication conditions in the presence of water vapor or oxygen so that the oxidation of diamond in said compact does not exceed that of a single crystal diamond of comparable weight processed under said fabrication conditions.
Claim 9
Independent Claim
95 words
A method for improving the oxidation resistance of a tool component polycrystalline compact of self-bonded diamond particles having a network of interconnected empty pores dispersed throughout the compact, the improvement comprising forming a continuous coating by chemical vapor deposition, said coating enveloping all of the exterior surfaces of said porous polycrystalline compact and being effective under tool metal bond fabrication conditions in the presence of water vapor or oxygen so that the oxidation of diamond in said compact does not exceed that of a single crystal diamond of comparable weight processed under said fabrication conditions.
Claim 10
Dependent Claim
14 words
The method of claim 7 wherein said coating comprises titanium carbide or titanium nitride.
Claim 11
Dependent Claim
11 words
The method of claim 7 wherein said coating comprises titanium carbide.
Claim 12
Dependent Claim
11 words
The method of claim 7 wherein said coating comprises titanium nitride.
Claim 13
Dependent Claim
13 words
The method of claim 7 wherein an overcoat of a metal is applied.
Claim 14
Dependent Claim
31 words
The method of claim 11 wherein said overcoat comprises a metal selected from the group consisting of nickel, copper, titanium, iron, cobalt, chromium, tantalum, tungsten, molybdenum, and alloys and mixtures thereof.
Claim 15
Dependent Claim
10 words
The method of claim 12 wherein said metal comprises nickel.
Claim 16
Dependent Claim
21 words
The method of claim 7 wherein said coating is applied at a thickness ranging from about 8 microns to 30 microns.
Claim 17
Dependent Claim
113 words
In a method for manufacturing a tool having an area comprising a metal matrix bonded to a polycrystalline compact of self-bonded diamond particles having a network of interconnected empty pores dispersed throughout the compact, 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 comprising titanium carbide or titanium nitride, said coating being 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 18
Dependent Claim
113 words
In a method for manufacturing a tool having an area comprising a metal matrix bonded to a polycrystalline compact of self-bonded diamond particles having a network of interconnected empty pores dispersed throughout the compact, 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 comprising titanium carbide or titanium nitride, said coating being 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 19
Dependent Claim
18 words
The method of claim 15 wherein said coating ranges from about 8 microns to 30 microns in thickness.
Claim 20
Dependent Claim
11 words
The method of claim 15 wherein said coating comprises titanium carbide.
Claim 21
Dependent Claim
11 words
The method of claim 15 wherein said coating comprises titanium nitride.
Claim 22
Dependent Claim
36 words
The method of claim 15 wherein said coated porous polycrystalline compact is overcoated with a metal selected from the group consisting of nickel, copper, titanium, iron, cobalt, chromium, tantalum, tungsten, molybdenum, and alloys and mixtures thereof.
Claim 23
Dependent Claim
10 words
The method of claim 19 wherein said metal comprises nickel.
References Cited (Backward Citations)
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