US4378975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive product
Assignee: Individual
•
Filing: 1981-08-12
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Granted: 1983-04-05
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Expires: 2001-08-12
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 N. Tomlinson
- 👤 Aulette Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:01
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: 12
Claim 1
Independent Claim
81 words
A tool insert comprising a plurality of discrete chromium-coated diamond 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, the concentration of diamond particles being in the range 10 to 40 percent by volume of the insert and the chromium coating being provided in an amount of up to 10 percent by weight coated particle.
Claim 2
Dependent Claim
81 words
A tool insert comprising a plurality of discrete chromium-coated diamond 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, the concentration of diamond particles being in the range 10 to 40 percent by volume of the insert and the chromium coating being provided in an amount of up to 10 percent by weight coated particle.
Claim 3
Dependent Claim
20 words
A tool insert according to claim 1 wherein the alloy contains 2 to 5 percent by weight boron or silicon.
Claim 4
Dependent Claim
16 words
A tool insert according to claim 1 wherein the abrasive particles are 200 microns or larger.
Claim 5
Dependent Claim
16 words
A tool insert according to claim 1 which has a cylindrical, conical, dome or triangular shape.
Claim 6
Dependent Claim
14 words
A tool insert according to claim 4 which has a substantially right-circular cylindrical shape.
Claim 7
Dependent Claim
17 words
A tool insert according to claim 4 the largest dimension of which is 5 to 15 mm.
Claim 8
Independent Claim
125 words
A method of making a tool insert comprising a plurality of discrete chromium-coated diamond 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, the concentration of diamond particles being in the range 10 to 40 percent by volume of the insert and the chromium coating being provided in an amount of up to 10 percent by weight of the coated particle, including the steps of mixing the chromium-coated diamond 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 diamond particles.
Claim 9
Independent Claim
125 words
A method of making a tool insert comprising a plurality of discrete chromium-coated diamond 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, the concentration of diamond particles being in the range 10 to 40 percent by volume of the insert and the chromium coating being provided in an amount of up to 10 percent by weight of the coated particle, including the steps of mixing the chromium-coated diamond 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 diamond particles.
Claim 10
Dependent Claim
29 words
A method according to claim 7 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 11
Dependent Claim
15 words
A method according to claim 8 wherein the pressure applied is at least 400 mPa.
Claim 12
Dependent Claim
21 words
A method according to claim 8 wherein the sintering takes place at a temperature below 1000° C. in a non-oxidising atmosphere.
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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) | 1986-04-04 | 1986-10-04 | 1987-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-04 | 1990-10-04 | 1991-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-04 | 1994-10-04 | 1995-04-05 | $7700.00 | Window Closed / Lapsed |