US4353714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycrystalline silicon-bonded cubic boron nitride body and method
Assignee: General Electric Co
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Filing: 1981-10-26
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Granted: 1982-10-12
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Expires: 2001-10-26
Abstract
Abstract A well-bonded polycrystalline cubic boron nitride body is produced by providing the cubic boron nitride particles with a discontinuous coating of tungsten or molybdenum and then infiltrating them in a mass with molten silicon or silicon-base alloy.
Inventors
- 👤 Minyoung Lee
- 👤 Lawrence E. Szala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:48
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/02; B29C43/10; B22; B22F; B22F3/00; B22F3/24; B22F3/26; B24; B24D; B24D18/00; B24D18/0009; B24D18/0027; B24D3/00; B24D3/02; B24D3/04; B24D3/06; C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; C04B35/5831; B29C2043/106; B29C43/32; B29C43/36; B29C43/361; B29C2043/3615; B29C2043/3628; B29K; B29K2303/00; B29K2303/04; B29K2303/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
A process for producing a bonded polycrystalline cubic boron nitride body of predetermined shape and size which comprises the steps of: (a) applying a coating of metal selected from the group consisting of molybdenum and tungsten to a plurality of cubic boron nitride particles covering at least 50 percent of the surface area thereof; (b) placing a mass of the coated particles in a mold cavity of size and shape corresponding to the size and shape of the desired bonded polycrystalline body; (c) infiltrating said mass of coated particles in the mold cavity under pressure with molten metal selected from the group consisting of silicon and silicon-base alloy; (d) cooling the infiltrated mass thereby solidifying the molten metal; and (e) recovering the resulting bonded polycrystalline cubic boron nitride body from the mold.
Claim 2
Dependent Claim
132 words
A process for producing a bonded polycrystalline cubic boron nitride body of predetermined shape and size which comprises the steps of: (a) applying a coating of metal selected from the group consisting of molybdenum and tungsten to a plurality of cubic boron nitride particles covering at least 50 percent of the surface area thereof; (b) placing a mass of the coated particles in a mold cavity of size and shape corresponding to the size and shape of the desired bonded polycrystalline body; (c) infiltrating said mass of coated particles in the mold cavity under pressure with molten metal selected from the group consisting of silicon and silicon-base alloy; (d) cooling the infiltrated mass thereby solidifying the molten metal; and (e) recovering the resulting bonded polycrystalline cubic boron nitride body from the mold.
Claim 3
Dependent Claim
28 words
The process of claim 1 in which the coating step is carried out so as to substantially entirely cover the surface area of each cubic boron nitride particle.
Claim 4
Dependent Claim
23 words
The process of claim 1 in which molybdenum is the coating metal and silicon-30% rhenium alloy is the bonding medium of the system.
Claim 5
Dependent Claim
22 words
The process of claim 1 in which tungsten is the coating metal and elemental silicon is the bonding medium of the system.
Claim 6
Dependent Claim
39 words
The process of claim 1 wherein the amount of coating metal added to the cubic boron nitride particles is in the range of from about 5 to about 20 weight percent of the mass of cubic boron nitride particles.
References Cited (Backward Citations)
DE197806C
Cited
US3982911A
Cited
US4011064A
Cited
US4063907A
Cited
US4220677A
Cited
US4124401A
Cited
US4168957A
Cited
US4220455A
Cited
US4247304A
Cited
US4242106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-11 | 1986-04-12 | 1986-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-11 | 1990-04-12 | 1990-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-11 | 1994-04-12 | 1994-10-12 | $7700.00 | Window Closed / Lapsed |