EP0090657A2
Expired / Lapsed
EP
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A method of making abrasive bodies
Assignee: De Beers Industrial Diamond Division Pty Ltd
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Filing: 1983-03-30
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Granted: —
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Expires: 2003-03-30
Abstract
Abstract There is provided an abrasive body comprising a composite abrasive compact bonded to a metal containing substrate, typically made of cemented carbide, through a bonding layer comprising nickel, copper, cobalt, iron or an alloy containing one or more of these metals. The abrasive body has particular application as a cutting element for a drill crown. The abrasive body is made by bonding the composite abrasive compact to the substrate using solid state diffusion bonding techniques.
Inventors
- 👤 Eric Alfred Almond
- 👤 Mark Godden Gee
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 02:58
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/16; B22; B22F; B22F3/00; B22F3/12; B22F3/14; B22F7/00; B22F7/06; B23K20/22; B23P; B23P15/00; B23P15/28; B23P15/30; B24; B24D; B24D18/00; B24D3/00; B24D3/007; B24D3/02; B24D3/04; B24D3/06; C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C04B37/00; C04B37/02; C04B37/023; C04B37/025; C04B37/026; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/08; C04B2237/12; C04B2237/123; C04B2237/124; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/345; C04B2237/348; C04B2237/36; C04B2237/361; C04B2237/363; C04B2237/368; C04B2237/40; C04B2237/401; C04B2237/405; C04B2237/50; C04B2237/52; C04B2237/64; C04B2237/70; C04B2237/708; C04B2237/72; C04B2237/76; C04B2237/78
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
47 words
An abrasive body comprising: (a) an abrasive compact; (b) a backing of cemented carbide bonded to the abrasive compact; and (c) a metal-containing substrate bonded to the' backing through a bonding layer. comprising nickel, copper, cobalt, iron or an alloy containing one or more of these metals.
Claim 2
Dependent Claim
47 words
An abrasive body comprising: (a) an abrasive compact; (b) a backing of cemented carbide bonded to the abrasive compact; and (c) a metal-containing substrate bonded to the' backing through a bonding layer. comprising nickel, copper, cobalt, iron or an alloy containing one or more of these metals.
Claim 3
Dependent Claim
19 words
An abrasive body according to claim 1 wherein the bonding layer has a thickness of up to 220 microns.
Claim 4
Dependent Claim
30 words
An abrasive body according to claim 1 or claim 2 wherein the shear strength of the bond between the backing and the substrate is at least 140 N/mm 2 .
Claim 5
Dependent Claim
19 words
An abrasive body according to any one of the preceding claims wherein the substrate is made of cemented carbide.
Claim 6
Dependent Claim
30 words
An abrasive body according to claim 4 wherein the cemented carbide of the substrate and backing is cemented tantalum carbide, cemented titanium carbide, cemented tungsten carbide or a mixture thereof.
Claim 7
Dependent Claim
20 words
An abrasive body according to claim 5 wherein the bonding metal of the cemented carbide is nickel, cobalt or iron.
Claim 8
Dependent Claim
32 words
An abrasive body of any one of the preceding claims wherein the substrate is larger in mass and volume than the combined mass and volume of the abrasive compact and carbide backing.
Claim 9
Dependent Claim
19 words
An abrasive body according to any one of the preceding claims wherein the abrasive compact is a diamond compact.
Claim 10
Dependent Claim
21 words
An abrasive body according to any one of the preceding claims for use as a cutting element for a drill crown.
Claim 11
Independent Claim
79 words
A method of making an abrasive body according to any one of the preceding claims including the steps of interposing a layer of nickel, copper, cobalt, iron or alloy containing one or more of these metals between a surface of the substrate and a surface of the cemented carbide backing to which the abrasive compact is bonded and diffusion bonding the backing to the substrate through the interposed layer at a temperature below the melting point of the layer.
Claim 12
Dependent Claim
130 words
A method of claim 10 including the steps cf: (a) providing a composite abrasive compact comprising an abrasive compact bonded to a cemented carbide backing; (b) bonding a layer of nickel, copper, cobalt, iron or an alloy containing one or more of these metals to a surface of a metal-containing substrate; (c) bringing the backing and substrate together so that the metal layer contacts a surface of the backing; (d) urging the backing and substrate together by applying a transverse pressure thereto; (e) raising the temperature of the metal layer to a suitable temperature below its melting point; and (f) maintaining the pressure and temperature for a time sufficient to cause diffusion bonding between the backing and the substrate, steps (e) and (f) being carried out in an inert atmosphere.
Claim 13
Dependent Claim
23 words
A method of claim 11 wherein the transverse pressure applied to the backing and substrate is in the range 40 to 300 N/mm2.
Claim 14
Dependent Claim
25 words
A method of claim 11 or claim 12 wherein the temperature to which the metal layer is raised is in the range 650 to 750"C.
Claim 15
Independent Claim
25 words
A method of any one of claims 11 to 13 wherein the pressure and temperature are maintained for a period of 5 to 3CU minutes.
Claim 16
Dependent Claim
20 words
A method of claim 14 wherein the pressure and temperature are maintained for a period of 5 to 35 minutes.
Claim 17
Independent Claim
98 words
A method according to any one of claims 11 to 15 wherein the substrate and backing after having been brought together in step (c) are placed in the cavity of an assembly comprising a surround body having a cavity formed therein and an expansion body located in the cavity and having a coefficient of thermal expansion greater than that of the surround body, and the temperature of the assembly raised to the desired temperature of step (e) thereby causing the expansion body to expand and apply the desired transverse pressure of step (d) to the backing and substrate.
Claim 18
Dependent Claim
20 words
A method according to claim 16 wherein the temperature of the assembly is raised by placing it in a furnace.
Claim 19
Dependent Claim
27 words
A method according to claim 16 or claim 17 wherein the surround body is made of cemented carbide or a ceramic based on silicon nitride or zirconia.
Claim 20
Independent Claim
19 words
A method according to any one of claims 16 to 18 wherein the expansion body is made of Nimonic.
Claim 21
Independent Claim
37 words
A method according to ary one of claims 11 to 19 wherein the surface of the metal layer which is brought into contact with the surface of the cemented carbide backing is polished prior to step (c).
Claim 22
Independent Claim
69 words
A method according to any one of claims 11 to 20 wherein the metal layer is bonded to the surface of the substrate by depositing the layer on the surface, applying a transverse pressure to the layer, raising the temperature of the layer to a temperature below its melting point and maintaining the pressure and temperature for a period sufficient to enable the layer to bond to the substrate.
Claim 23
Dependent Claim
23 words
A method'of claim 21 wherein the pressure applied to the metal layer is in the range 1 to 200 N/ mm 2 .
Claim 24
Dependent Claim
25 words
A method of claim 21 or claim 22 wherein the temperature to which the metal layer is raised is in the range 700°C to 1100°C.
Claim 25
Independent Claim
30 words
A method of any one of claims 21 to 23 wherein the pressure and temperature applied to the metal layer are maintained for a period of 5 to 300 minutes.
Claim 26
Independent Claim
30 words
A method of any one of claims 21 to 24 wherein the pressure and temperature applied to the metal layer are maintained for a period of 5 to 30 minutes.
References Cited (Backward Citations)
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