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US5087434A
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Synthesis of diamond powders in the gas phase
Assignee: Pennsylvania Research Corp
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Filing: 1989-04-21
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Granted: 1992-02-11
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Expires: 2009-04-21
Abstract
Abstract Compositions of synthetic diamond particles and their synthesis by homogeneous nucleation of seed particles in the gas phase followed by growth of diamond or diamond-like carbon on these seeds is disclosed. These particles are characterized by their controlled size, shape, purity, surface characteristics, and their electrical properties and crystal structure.
Inventors
- 👤 Michael Y. Frenklach
- 👤 Karl E. Spear
- 👤 Richard J. Koba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:49
CPC Classifications
C; C30; C30B; C30B25/00; C30B25/02; C30B25/10; C30B25/105; C01; C01B; C01B32/00; C01B32/25; C01B32/26; C30B29/00; C30B29/02; C30B29/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
80 words
A method for the synthesis of diamond or diamond-like carbon particles directly in the gas phase through homogeneous nucleation independent of any surface which comprises: providing a reaction vessel for containment of reaction gases; homogeneously precipitating a diamond or diamond-like growth seed from a gas phase in said reaction vessel; depositing diamond or diamond-like carbon from a second gas phase about said seed to produce diamond or diamond-like particles in said reaction vessel; and removing said particles from said vessel.
Claim 2
Independent Claim
80 words
A method for the synthesis of diamond or diamond-like carbon particles directly in the gas phase through homogeneous nucleation independent of any surface which comprises: providing a reaction vessel for containment of reaction gases; homogeneously precipitating a diamond or diamond-like growth seed from a gas phase in said reaction vessel; depositing diamond or diamond-like carbon from a second gas phase about said seed to produce diamond or diamond-like particles in said reaction vessel; and removing said particles from said vessel.
Claim 3
Independent Claim
88 words
A method for the synthesis of diamond or diamond-like carbon particles directly in the gas phase through homogeneous nucleation independent of any surface which comprises: providing a reaction vessel having a nucleation zone and a growth zone; precipitating a diamond or diamond-like growth seed from a first gas phase in said nucleation zone; depositing diamond or diamond-like carbon from a second gas phase about said seed in said growth zone to form a diamond or diamond-like particle; and removing the diamond or diamond-like particle from the reaction vessel.
Claim 4
Independent Claim
88 words
A method for the synthesis of diamond or diamond-like carbon particles directly in the gas phase through homogeneous nucleation independent of any surface which comprises: providing a reaction vessel having a nucleation zone and a growth zone; precipitating a diamond or diamond-like growth seed from a first gas phase in said nucleation zone; depositing diamond or diamond-like carbon from a second gas phase about said seed in said growth zone to form a diamond or diamond-like particle; and removing the diamond or diamond-like particle from the reaction vessel.
Claim 5
Dependent Claim
18 words
A method according to claim 2 wherein the nucleation zone and the reaction zone are the same zone.
Claim 6
Dependent Claim
21 words
A method according to claim 2 which further comprises adding a nucleating stimulant to the nucleation zone in the reaction vessel.
Claim 7
Dependent Claim
25 words
A method according to claim 4 wherein said nucleating stimulant is taken from the group consisting boron, silicon, and titanium containing gases and mixtures thereof.
Claim 8
Dependent Claim
25 words
A method according to claim 2 wherein the particles comprise crystalline diamond, non-crystalline diamond-like carbon, cubic 3C diamond, hexagonal 6H diamond, and hexagonal 2H diamond.
Claim 9
Independent Claim
115 words
A method for the synthesis of diamond or diamond-like carbon particles directly in the gas phase through homogeneous nucleation independent of any surface which comprises: providing a reaction vessel having a nucleation zone and a growth zone which may be the same or different; adding a gas mixture comprising hydrocarbon gases, a halogenated-hydrocarbon gas, an inert gas, and hydrogen into said reaction vessel; activating the gas mixture in said vessel and thereby homogeneously precipitating a diamond or diamond-like growth seed; depositing diamond or diamond-like carbon from a second gas mixture about said seed in said growth zone to form a diamond or diamond-like particle; and removing the diamond or diamond-like particle from the reaction vessel.
Claim 10
Independent Claim
115 words
A method for the synthesis of diamond or diamond-like carbon particles directly in the gas phase through homogeneous nucleation independent of any surface which comprises: providing a reaction vessel having a nucleation zone and a growth zone which may be the same or different; adding a gas mixture comprising hydrocarbon gases, a halogenated-hydrocarbon gas, an inert gas, and hydrogen into said reaction vessel; activating the gas mixture in said vessel and thereby homogeneously precipitating a diamond or diamond-like growth seed; depositing diamond or diamond-like carbon from a second gas mixture about said seed in said growth zone to form a diamond or diamond-like particle; and removing the diamond or diamond-like particle from the reaction vessel.
Claim 11
Dependent Claim
23 words
A method according to claim 7 wherein said activating comprises exposing the gas mixture to an externally applied activating energy field or heat.
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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) | 1995-02-10 | 1995-08-12 | 1996-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-10 | 1999-08-12 | 2000-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-10 | 2003-08-12 | 2004-02-11 | $7700.00 | Window Closed / Lapsed |