US5066513A
Expired / Lapsed
US
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Method of producing titanium nitride coatings by electric arc thermal spray
Assignee: Air Products and Chemicals Inc
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Filing: 1990-02-06
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Granted: 1991-11-19
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Expires: 2010-02-06
Abstract
Abstract Wear resistant surfaces can have their service life increased by being coated with a titanium nitride based coating applied by the electric arc thermal spray process using at least one pre-nitrided titanium feed wire and nitrogen in the arc spray gun.
Inventors
- 👤 Zbigniew Zurecki
- 👤 Edward A. Hayduk, Jr.
- 👤 John G. North
- 👤 Robert B. Swan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:08
CPC Classifications
C; C23; C23C; C23C4/00; C23C4/04; C23C4/10; C23C4/12; C23C4/131; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
78 words
A method of improving the mechanical wear resistance of a substrate comprising the steps of: exposing said substrate to an effluent from an electric arc thermal spray gun operated in the atmosphere using a pretreated titanium wire, said titanium wire being pretreated by annealing in nitrogen to increase the nitrogen content of the wire to at least 500 PPM, and a nitrogen gas as the atomizing/propelling gas, whereby a substantially titanium nitride coating is produced on said substrate.
Claim 2
Independent Claim
78 words
A method of improving the mechanical wear resistance of a substrate comprising the steps of: exposing said substrate to an effluent from an electric arc thermal spray gun operated in the atmosphere using a pretreated titanium wire, said titanium wire being pretreated by annealing in nitrogen to increase the nitrogen content of the wire to at least 500 PPM, and a nitrogen gas as the atomizing/propelling gas, whereby a substantially titanium nitride coating is produced on said substrate.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein said coating has a thickness of at least 0.001 inch.
Claim 4
Dependent Claim
30 words
A method according to claim 1 wherein the electric arc thermal spray gun is operated to produce a coating having a titanium to nitrogen ratio of between 1 and 2.
Claim 5
Dependent Claim
24 words
A method according to claim 1 wherein said electric arc thermal spray gun is operated with a current supply between 100 and 400 amperes.
Claim 6
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 said substrate.
Claim 7
Dependent Claim
15 words
A method according to claim 4 wherein said spacing is between 3 and 8 inches.
Claim 8
Dependent Claim
60 words
A method according to claim 1 wherein said effluent from said electric arc thermal spray gun is formed using at least two feed wires with only one of the feed wires being titanium wire, and the other feed wire is made of Fe, Cr, Ni, Mo, W, lower melting point non-ferrous metals, and their alloys and ceramic or intermetallic compounds.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-18 | 1995-05-20 | 1995-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-18 | 1999-05-20 | 1999-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-18 | 2003-05-20 | 2003-11-19 | $7700.00 | Window Closed / Lapsed |