US5254359A
Expired / Lapsed
US
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Method of forming titanium nitride coatings on carbon/graphite substrates by electric arc thermal spray process using titanium feed wire and nitrogen as the atomizing gas
Assignee: Air Products and Chemicals Inc
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Filing: 1991-06-14
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Granted: 1993-10-19
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Expires: 2011-06-14
Abstract
Abstract Graphite and/or carbon surfaces are coated with a titanium nitride coating by exposing the substrate to electric arc thermal spray process wherein titanium wire as the source of titanium and nitrogen is used as the propelling (atomizing) gas.
Inventors
- 👤 Zbigniew Zurecki
- 👤 Edward A. Hayduk, Jr.
- 👤 John G. North
- 👤 Robert B. Swan
- 👤 David L. Mitchell, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:34
CPC Classifications
H; H01; H01R; H01R43/00; H01R43/12; C; C23; C23C; C23C4/00; C23C4/12; C23C4/131; H05; H05B; H05B7/00; H05B7/02; H05B7/06; H05B7/08; H05B7/085; Y; Y10; Y10S; Y10S29/00; Y10S29/039; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12625
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
82 words
A method of improving the high temperature oxidation and mechanical wear resistance of a carbon or graphite substrate comprising the steps of: exposing said substrate without preheating and without being confined in a pressure or atmosphere controlled chamber to the effluent from an electric arc thermal spray gun using titanium wire and nitrogen gas as the atomizing/propelling gas, whereby a substantially titanium nitride electrically conductive coating having a titanium to nitrogen ratio of between 1 and 2 is produced on said substrate.
Claim 2
Independent Claim
82 words
A method of improving the high temperature oxidation and mechanical wear resistance of a carbon or graphite substrate comprising the steps of: exposing said substrate without preheating and without being confined in a pressure or atmosphere controlled chamber to the effluent from an electric arc thermal spray gun using titanium wire and nitrogen gas as the atomizing/propelling gas, whereby a substantially titanium nitride electrically conductive coating having a titanium to nitrogen ratio of between 1 and 2 is produced on said substrate.
Claim 3
Dependent Claim
17 words
A method according to claim 1 where the coating has a thickness of at least 0.002 inches.
Claim 4
Dependent Claim
24 words
A method according to claim 1 wherein said electric arc thermal spray gas is operated with a current supply between 50 and 300 amperes.
Claim 5
Dependent Claim
31 words
A method according to claim 1 wherein the distance from the electric arc thermal spray gun to said substrate is set at the minimum spacing to prevent overheating of the substrate.
Claim 6
Dependent Claim
15 words
A method according to claim 4 wherein said distance is between five and eight inches.
Claim 7
Dependent Claim
15 words
A process according to claim 1 wherein said substrate is an electric arc furnace electrode.
Claim 8
Dependent Claim
14 words
A process according to claim 1 wherein said substrate is an electrical contact device.
Claim 9
Dependent Claim
15 words
A process according to claim 1 wherein said substrate is a sliding electrical contact device.
Claim 10
Independent Claim
93 words
A method of improving the high temperature oxidation and mechanical wear resistance of a carbon or graphite substrate comprising the steps of: exposing said substrate without preheating and without being confined in a pressure or atmosphere controlled chamber to the effluent from an electric arc thermal spray gun using a titanium wire and a wire of pure metal or pre-alloyed metal capable of forming a protective oxide coating and nitrogen gas as the atomizing/propelling gas, whereby a titanium nitride and titanium metal or titanium pre-alloyed electrically conductive coating is produced on said substrate.
Claim 11
Independent Claim
93 words
A method of improving the high temperature oxidation and mechanical wear resistance of a carbon or graphite substrate comprising the steps of: exposing said substrate without preheating and without being confined in a pressure or atmosphere controlled chamber to the effluent from an electric arc thermal spray gun using a titanium wire and a wire of pure metal or pre-alloyed metal capable of forming a protective oxide coating and nitrogen gas as the atomizing/propelling gas, whereby a titanium nitride and titanium metal or titanium pre-alloyed electrically conductive coating is produced on said substrate.
Claim 12
Dependent Claim
14 words
A method according to claim 4 wherein the non-titanium wire is an aluminum-silicon alloy.
Claim 13
Dependent Claim
17 words
A method according to claim 4 where the coating has a thickness of at least 0.002 inches.
Claim 14
Dependent Claim
24 words
A method according to claim 4 wherein said electric arc thermal spray gas is operated with a current supply between 50 and 300 amperes.
Claim 15
Dependent Claim
31 words
A method according to claim 4 wherein the distance from the electric arc thermal spray gun to said substrate is set at the minimum spacing to prevent overheating of the substrate.
Claim 16
Dependent Claim
15 words
A method according to claim 13 wherein said distance is between five and eight inches.
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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) | 1996-10-18 | 1997-04-19 | 1997-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-18 | 2001-04-19 | 2001-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-18 | 2005-04-19 | 2005-10-19 | $7700.00 | Window Closed / Lapsed |