Patent US2474558A successfully refreshed from Google Patents.
Patent EP0046374A2 successfully refreshed from Google Patents.
EP0046374A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Tool insert
Assignee: De Beers Industrial Diamond Division Pty Ltd
•
Filing: 1981-08-13
•
Granted: —
•
Expires: 2001-08-13
Abstract
Abstract The invention provides an abrasive body which will generally be of cylindrical shape comprising a plurality of superhard abrasive particles such as diamond bonded together by means of a tough wear-resistant nickel based alloy having a melting point of below 1000°C. These alloys are known as hard facing alloys. The abrasive bodies may be used as inserts for drill crowns. The bodies are made by mixing the abrasive particles with the alloy in powdered form, producing a green-state, coherent body from the mixture, generally by cold pressing, and sintering the green-state product under conditions which inhibit degradation of the abrasive particle.
Inventors
- 👤 Peter Noel Tomlinson
- 👤 Aulette Davies
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 08:32
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; E21B10/5676; B; B22; B22F; B22F7/00; B22F7/06; B24; B24D; B24D3/00; B24D3/02; B24D3/04; B24D3/06; C; C09; C09K; C09K3/00; C09K3/14; C09K3/1436; C09K3/1445; C22; C22C; C22C26/00; B22F2999/00
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
43 words
An abrasive body comprising a plurality of superhard abrasive particles bonded together by means of a tough wear-resistant bonding alloy having a melting point below 1100°C and containing 65 to 90 percent by weight nickel and 5 to 15 percent by weight chromium.
Claim 2
Dependent Claim
43 words
An abrasive body comprising a plurality of superhard abrasive particles bonded together by means of a tough wear-resistant bonding alloy having a melting point below 1100°C and containing 65 to 90 percent by weight nickel and 5 to 15 percent by weight chromium.
Claim 3
Dependent Claim
20 words
An abrasive body according to claim 1 wherein the alloy contains 2 to 5 percent by weight boron or silicon.
Claim 4
Dependent Claim
19 words
An abrasive body according to claim 1 or claim 2 wherein the abrasive particles are 200 microns or larger.
Claim 5
Dependent Claim
18 words
An abrasive body according to any one of the preceding claims wherein the abrasive particles are diamond particles.
Claim 6
Dependent Claim
22 words
An abrasive body according to any one of the preceding claims wherein the abrasive particles are provided with a thin metal coating.
Claim 7
Dependent Claim
26 words
An abrasive body according to claim 5 wherein the coating is provided in an amount of up to 10 percent by weight of the coated particle.
Claim 8
Dependent Claim
18 words
An abrasive body according to claim 5 or claim 6 wherein the metal coating is a chromium coating.
Claim 9
Dependent Claim
26 words
An abrasive body according to any one of the preceding claims wherein the abrasive particle concentration is in the range 10 to 40 percent by volume.
Claim 10
Dependent Claim
38 words
An abrasive body according to any one of the preceding claims wherein the abrasive particles form part of a substantially spherical pellet having the abrasive particle forming the core thereof and an outer wear-resistant coating around the core.
Claim 11
Dependent Claim
34 words
An abrasive body according to claim 9 wherein the wear-resistant coating is a tough wear-resistant alloy, a metal bonded carbide, a metal bonded nitride, a metal bonded boride or a metal bonded silicon carbide.
Claim 12
Dependent Claim
32 words
An abrasive body according to claim 9 or claim 10 wherein the outer diameter of the pellet is 2 to 3 times the size of the abrasive particle forming the core thereof.
Claim 13
Dependent Claim
20 words
An abrasive body according to any one of claims 9 to 11 wherein the coating is a nickel/iron based alloy.
Claim 14
Dependent Claim
44 words
An abrasive body according to any one of claims 9 to 11 wherein the coating is a tough wear-resistant alloy having a melting point below 1100°C and containing 65 to 90 percent by weight nickel and 5 to 15 - percent by weight chromium.
Claim 15
Dependent Claim
27 words
An abrasive body according to any one of claims 11 to 13 wherein the abrasive particle concentration is in the range 10 to 25 percent by volume.
Claim 16
Dependent Claim
20 words
An abrasive body according to any one of the preceding claims which has a cylindrical, conical, dome or triangular shape.
Claim 17
Dependent Claim
14 words
An abrasive body according to claim 15 which has a substantially right-circular cylindrical shape.
Claim 18
Dependent Claim
21 words
An abrasive body according to any one of the preceding claims the largest dimension of which is 5 to 15 mm.
Claim 19
Dependent Claim
21 words
An abrasive body according to any one of the preceding claims which is encased in a surround of metal bonded carbide.
Claim 20
Dependent Claim
31 words
An abrasive tool comprising a plurality of abrasive bodies according to any one of the preceding claims, each so mounted in the tool as to present an abrading surface or edge.
Claim 21
Dependent Claim
13 words
-20. An abrasive tool according to claim 19 which is a drill crown.
Claim 22
Independent Claim
52 words
A method of making an abrasive body according to any one of claims 1 to 18 comprising the steps of mixing the abrasive particles with the alloy in powdered form, producing a green-state, coherent body from the mixture and sintering the green-state product under conditions which inhibit degradation of the abrasive particle.
Claim 23
Dependent Claim
29 words
A method according to claim 21 wherein the green-state, coherent body is produced by placing the mixture in a mould and applying pressure to the mixture at ambient temperature.
Claim 24
Dependent Claim
15 words
A method according to claim 22 wherein the pressure applied is at least 400 mPa.
Claim 25
Independent Claim
32 words
A method according to any one of claims 21 to 23 wherein the abrasive particles are diamond particles and the sintering takes place at a temperature below 1000°C in a non-oxidising atmosphere.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.