US4871377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite abrasive compact having high thermal stability and transverse rupture strength
Assignee: Diamond Innovations Inc
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Filing: 1988-02-03
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Granted: 1989-10-03
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Expires: 2008-02-03
Abstract
Abstract A composite compact adapted for high-temperature uses, such as a cutter on a rotary drill bit, which includes a relatively thick table of diamond or boron nitride particles with a strong, chemically inert binder matrix and a thin metal layer bonded directly to the table in a HP/HT press. The table is characterized by having high thermal stability at temperatures up to 1200° C. The thickness of the thin metal layer, which does not exceed one-half that of the table, is selected such that at temperatures up to 1200° C. the differential forces due to thermal expansion do not exceed the fracture strength of the table.
Inventors
- 👤 Robert H. Frushour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:13
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; B; B24; B24D; B24D3/00; B24D3/007; B24D3/02; B24D3/04; B24D3/06; B24D3/10; B24D99/00; B24D99/005
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
81 words
A composite abrasive compact having high thermal stability at temperatures of at least 850° C. and transverse rupture strength of at least 70 Kg/mm 2 which includes a relatively thick table of well sintered abrasive particles bonded in particle-to-particle contact with interstices between adjacent particles, a strong chemically inert binder matrix dispersed throughout the table in the interstices, and a relatively thin layer of metal having a melting point above 1000° C. bonded directly to the table in a HP/HT press.
Claim 2
Dependent Claim
81 words
A composite abrasive compact having high thermal stability at temperatures of at least 850° C. and transverse rupture strength of at least 70 Kg/mm 2 which includes a relatively thick table of well sintered abrasive particles bonded in particle-to-particle contact with interstices between adjacent particles, a strong chemically inert binder matrix dispersed throughout the table in the interstices, and a relatively thin layer of metal having a melting point above 1000° C. bonded directly to the table in a HP/HT press.
Claim 3
Dependent Claim
24 words
A composite abrasive compact as set forth in claim 1 wherein the table is at least twice the thickness of the layer of metal.
Claim 4
Dependent Claim
31 words
A composite abrasive compact as set forth in claim 2 wherein the table is at least 10 mils thick and the layer of metal is no more than 5 mils thick.
Claim 5
Dependent Claim
38 words
A composite abrasive compact as set forth in claim 1 wherein the abrasive particles are diamond and the binder matrix is chosen from the group including silicon, boron, alloys/mixtures thereof with nickel, iron, or other Group VIII metals.
Claim 6
Dependent Claim
31 words
A composite abrasive compact as set forth in claim 4 wherein the thin layer of metal is chosen from the group including tungsten, tungsten carbide, tantalum, titanium and Group VIII metals.
Claim 7
Dependent Claim
76 words
A composite compact which is thermally stable at temperatures up to 1200° C. and which includes an abrasive table of well sintered particles chosen from the group which includes diamond and boron nitride, said particles being bonded in particle-to-particle contact, a strong binder matrix which includes a non-catalyst solvent metal dispersed throughout the table, and a thin layer of metal having a melting point above 1000° C. bonded directly to the table in a HP/HT press.
Claim 8
Dependent Claim
76 words
A composite compact which is thermally stable at temperatures up to 1200° C. and which includes an abrasive table of well sintered particles chosen from the group which includes diamond and boron nitride, said particles being bonded in particle-to-particle contact, a strong binder matrix which includes a non-catalyst solvent metal dispersed throughout the table, and a thin layer of metal having a melting point above 1000° C. bonded directly to the table in a HP/HT press.
Claim 9
Dependent Claim
43 words
A composite compact as set forth in claim 6 wherein the thickness of the thin layer of metal is such that at temperatures up to 1200° C. the differential forces due to thermal expansion do not exceed the fracture strength of the table.
Claim 10
Dependent Claim
26 words
A composite compact as set forth in claim 7 wherein the thickness of the thin layer of metal does not exceed one-half that of the table.
Claim 11
Dependent Claim
35 words
A composite compact as set forth in claim 7 wherein the binder matrix is chosen from the group including silicon, boron, alloys/mixtures of silicon or boron with nickel, iron, cobalt or other Group VIII metals.
Claim 12
Dependent Claim
30 words
A composite compact as set forth in claim 9 wherein the thin layer of metal is chosen from the group including tungsten, tungsten carbide, tantalum, titanium and Group VIII metals.
Claim 13
Dependent Claim
92 words
A composite compact which is thermally stable at temperatures up to 1200° C. and which includes an abrasive table of well sintered particles chosen from the group which includes diamond and boron nitride, said particles being bonded in particle-to-particle contact, and a thin layer of metal having a melting point above 1200° C. bonded directly to the table in a HP/HT press, the thickness of the layer being such that at temperatures up to 1200° C. the differential forces due to thermal expansion do not exceed the fracture strength of the table.
Claim 14
Dependent Claim
92 words
A composite compact which is thermally stable at temperatures up to 1200° C. and which includes an abrasive table of well sintered particles chosen from the group which includes diamond and boron nitride, said particles being bonded in particle-to-particle contact, and a thin layer of metal having a melting point above 1200° C. bonded directly to the table in a HP/HT press, the thickness of the layer being such that at temperatures up to 1200° C. the differential forces due to thermal expansion do not exceed the fracture strength of the table.
Claim 15
Dependent Claim
26 words
A composite compact as set forth in claim 11 wherein the thickness of the thin layer of metal does not exceed one-half that of the table.
Claim 16
Dependent Claim
30 words
A composite compact as set forth in claim 12 wherein the thin layer of metal is chosen from the group including tungsten, tungsten carbide, tantalum, titanium and Group VIII metals.
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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) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |