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Patent US4650776A successfully refreshed from Google Patents.
US4650776A
Expired / Lapsed
US
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Cubic boron nitride compact and method of making
Assignee: Industrielle de Combustible Nucleaire Ste
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Filing: 1985-02-20
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Granted: 1987-03-17
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Expires: 2005-02-20
Abstract
Abstract The invention is a process for preparing a sintered polycrystalline compact of cubic boron nitride (CBN) with substantial intercrystalline bonding, together with the compact produced by the process. A carbon containing material, such as diamond or graphite, is added to a binder material which comprises elemental silicon. The carbon from the carbon containing material reacts with the silicon to form silicon carbide. Having silicon carbide as a constituent of the final product is preferable to having elemental silicon because the silicon carbide does not expand on cooling, and is also harder and more wear resistant than elemental silicon. In this way, the benefits of using elemental silicon in a binder system to enhance intercrystalline bonding of the CBN are realized while avoiding the disadvantages otherwise present. Another advantage is provided in the compact of this invention may be cut into precision shapes with a conventional Electric Discharge Machine (EDM).
Inventors
- 👤 Jean-Michel Cerceau
- 👤 H. Tracy Hall, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:35
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; C04B35/5831
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
100 words
A process for preparing a sintered polycrystalline CBN compact with substantial intercrystalline bonding which comprises: forming a mixture of grains of CBN with a minor amount of a binder material comprised of silicon, and a carbon containing material, wherein the amount of carbon containing material is selected so as to provide an atomic ratio of carbon to silicon which is between 1:2 to 2:1; subjecting the mixture to elevated temperature and pressure conditions at which the CBN is thermodynamically stable; and maintaining the elevated conditions for a time sufficient to allow for substantial intercrystalline bonding to thereby sinter the compact.
Claim 2
Dependent Claim
100 words
A process for preparing a sintered polycrystalline CBN compact with substantial intercrystalline bonding which comprises: forming a mixture of grains of CBN with a minor amount of a binder material comprised of silicon, and a carbon containing material, wherein the amount of carbon containing material is selected so as to provide an atomic ratio of carbon to silicon which is between 1:2 to 2:1; subjecting the mixture to elevated temperature and pressure conditions at which the CBN is thermodynamically stable; and maintaining the elevated conditions for a time sufficient to allow for substantial intercrystalline bonding to thereby sinter the compact.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the carbon containing material comprises diamond.
Claim 4
Dependent Claim
30 words
The process of claim 2 wherein the amount of diamond is selected so as to provide an atomic ratio of carbon to elemental silicon which is approximately equal to 1:1.
Claim 5
Dependent Claim
30 words
The process of claim 2, wherein the amount of diamond is selected so as to ensure that substantially all of the elemental silicon is converted to silicon carbide upon pressing.
Claim 6
Dependent Claim
24 words
The process of claim 2 wherein the binder material is present in a volume percent of between 3 and 30 percent of the mixture.
Claim 7
Dependent Claim
24 words
The process of claim 2 wherein the binder material is present in a volume percent of between 15 and 20 percent of the mixture.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein the carbon containing material comprises graphite.
Claim 9
Dependent Claim
30 words
The process of claim 7 wherein the amount of graphite is selected so as to provide an atomic ratio of carbon to elemental silicon which is approximately equal to 1:1.
Claim 10
Dependent Claim
30 words
The process of claim 2 wherein the amount of graphite is selected so as to ensure that substantially all of the elemental silicon is converted to silicon carbide upon pressing.
Claim 11
Dependent Claim
24 words
The process of claim 7 wherein the binder material is present in a volume percent of between 3 and 30 percent of the mixture.
Claim 12
Dependent Claim
24 words
The process of claim 7 wherein the binder material is present in a volume percent of between 15 and 20 percent of the mixture.
Claim 13
Dependent Claim
40 words
The process of claim 1 wherein the carbon containing material is selected from the group consisting of carbon, diamond, graphite, carbon black, aluminum carbide, boron carbide, lithium carbide, calcium carbide, lanthanum carbide, or cerium carbide, as well as combinations thereof.
Claim 14
Dependent Claim
32 words
The process of claim 12 wherein the amount of carbon containing material is selected so as to provide an atomic ratio of carbon to elemental silicon which is approximately equal to 1:1.
Claim 15
Dependent Claim
32 words
The process of claim 12 wherein the amount of carbon containing material is selected so as to ensure that substantially all of the elemental silicon is converted to silicon carbide upon pressing.
Claim 16
Dependent Claim
24 words
The process of claim 12 wherein the binder material is present in a volume percent of between 3 and 30 percent of the mixture.
Claim 17
Dependent Claim
24 words
The process of claim 12 wherein the binder material is present in a volume percent of between 15 and 20 percent of the mixture.
Claim 18
Dependent Claim
26 words
A sintered polycrystalline CBN compact produced according to claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16.
Claim 19
Dependent Claim
103 words
A process for preparing a sintered polycrystalline CBN compact with substantial intercrystalline bonding which comprises: forming a mixture of grains of CBN with a minor amount of a binder material consisting essentially of silicon, a carbon containing material, and an aluminum-containing material selected from the group consisting of aluminum alone, aluminum with aluminum nitride, aluminum with aluminum diboride, or aluminum with aluminum nitride and aluminum diboride; pressing the mixture to elevated temperature and pressure conditions at which conditions the CBN is thermodynamically stable; and maintaining the elevated conditions for a time sufficient to allow for substantial intercrystalline bonding to thereby sinter the compact.
Claim 20
Dependent Claim
103 words
A process for preparing a sintered polycrystalline CBN compact with substantial intercrystalline bonding which comprises: forming a mixture of grains of CBN with a minor amount of a binder material consisting essentially of silicon, a carbon containing material, and an aluminum-containing material selected from the group consisting of aluminum alone, aluminum with aluminum nitride, aluminum with aluminum diboride, or aluminum with aluminum nitride and aluminum diboride; pressing the mixture to elevated temperature and pressure conditions at which conditions the CBN is thermodynamically stable; and maintaining the elevated conditions for a time sufficient to allow for substantial intercrystalline bonding to thereby sinter the compact.
Claim 21
Dependent Claim
12 words
The process of claim 18 wherein the carbon containing material comprises diamond.
Claim 22
Dependent Claim
30 words
The process of claim 18 wherein the amount of diamond is selected so as to provide an atomic ratio of carbon to elemental silicon which is between 1:2 and 2:1.
Claim 23
Dependent Claim
30 words
The process of claim 19 wherein the amount of diamond is selected so as to provide an atomic ratio of carbon to elemental silicon which is approximately equal to 1:1.
Claim 24
Dependent Claim
30 words
The process of claim 19 wherein the amount of diamond is selected so as to ensure that substantially all of the elemental silicon is converted to silicon carbide upon pressing.
Claim 25
Dependent Claim
24 words
The process of claim 19 wherein the binder material is present in a volume percent of between 3 and 30 percent of the mixture.
Claim 26
Dependent Claim
24 words
The process of claim 19 wherein the binder material is present in a volume percent of between 15 and 20 percent of the mixture.
Claim 27
Dependent Claim
12 words
The process of claim 18 wherein the carbon containing material comprises graphite.
Claim 28
Dependent Claim
30 words
The process of claim 25 wherein the amount of graphite is selected so as to provide an atomic ratio of carbon to elemental silicon which is between 1:2 and 2:1.
Claim 29
Dependent Claim
30 words
The process of claim 25 wherein the amount of graphite is selected so as to provide an atomic ratio of carbon to elemental silicon which is approximately equal to 1:1.
Claim 30
Dependent Claim
30 words
The process of claim 25 wherein the amount of graphite is selected so as to ensure that substantially all of the elemental silicon is converted to silicon carbide upon pressing.
Claim 31
Dependent Claim
24 words
The process of claim 25 wherein the binder material is present in a volume percent of between 3 and 30 percent of the mixture.
Claim 32
Dependent Claim
24 words
The process of claim 25 wherein the binder material is present in a volume percent of between 15 and 20 percent of the mixture.
Claim 33
Dependent Claim
40 words
The process of claim 18 wherein the carbon containing material is selected from the group consisting of carbon, diamond, graphite, carbon black, aluminum carbide, boron carbide, lithium carbide, calcium carbide, lanthanum carbide, or cerium carbide, as well as combinations thereof.
Claim 34
Dependent Claim
32 words
The process of claim 31 wherein the amount of carbon containing material is selected so as to provide an atomic ratio of carbon to elemental silicon which is between 1:2 and 2:1.
Claim 35
Dependent Claim
32 words
The process of claim 31 wherein the amount of carbon containing material is selected so as to provide an atomic ratio of carbon to elemental silicon which is approximately equal to 1:1.
Claim 36
Dependent Claim
32 words
The process of claim 31 wherein the amount of carbon containing material is selected so as to ensure that substantially all of the elemental silicon is converted to silicon carbide upon pressing.
Claim 37
Dependent Claim
24 words
The process of claim 31 wherein the binder material is present in a volume percent of between 3 and 30 percent of the mixture.
Claim 38
Dependent Claim
24 words
The process of claim 31 wherein the binder material is present in a volume percent of between 15 and 20 percent of the mixture.
Claim 39
Dependent Claim
29 words
A sintered polycrystalline CBN compact produced according to claims 18, 19, 20, 21, 22, 23 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, or 36.
References Cited (Backward Citations)
US3918219A
Cited
US3743489A
Cited
US3852099A
Cited
US3959443A
Cited
US3944398A
Cited
US4334928A
Cited
US4151686A
Cited
US4220455A
Cited
US4238433A
Cited
US4353953A
Cited
US4247304A
Cited
US4242106A
Cited
US4375517A
Cited
US4343651A
Cited
US4394170A
Cited
US4381271A
Cited
JPS5861254A
Cited
US4353714A
Cited
US4401443A
Cited
US4361543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |