US4629631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment of metals
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1985-09-09
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Granted: 1986-12-16
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Expires: 2005-09-09
Abstract
Abstract A process for hardening the surface of a metal body in which the surface is first bombarded with ions capable of occupying interstitial sites in its crystal lattice, then a coating of a reactive metal is deposited on the surface, and finally the coating is bombarded with ions which will react with it to form a hard material such as a carbide or nitride. The bombardment is continued until the hard material has become embodied in the surface by means of radiation enhanced diffusion.
Inventors
- 👤 Geoffrey Dearnaley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:03
CPC Classifications
C; C23; C23C; C23C26/00; C23C10/00; C23C14/00; C23C14/22; C23C14/48; C23C28/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
A method of modifying the properties of a surface of a metal body, wherein there is included the operations of implanting into the said surface ions of a material capable of occupying interstitial sites in the crystal lattice of the body, so as to harden initially the said surface, depositing onto the hardened surface a layer of a reactive metal, and subjecting the deposited layer to bombardment with a reactive ion species capable of reacting with the said reactive metal to provide a hard, wear resisting compound, the energy of the reactive ions species initially being such as to cause radiation enhanced diffusion of the metal layer into the substrate and then reduced so as to implant the reactive ion species into the metallic layer to form the said hard, wear resisting compound.
Claim 2
Independent Claim
133 words
A method of modifying the properties of a surface of a metal body, wherein there is included the operations of implanting into the said surface ions of a material capable of occupying interstitial sites in the crystal lattice of the body, so as to harden initially the said surface, depositing onto the hardened surface a layer of a reactive metal, and subjecting the deposited layer to bombardment with a reactive ion species capable of reacting with the said reactive metal to provide a hard, wear resisting compound, the energy of the reactive ions species initially being such as to cause radiation enhanced diffusion of the metal layer into the substrate and then reduced so as to implant the reactive ion species into the metallic layer to form the said hard, wear resisting compound.
Claim 3
Dependent Claim
35 words
A method according to claim 1 wherein the ions which are capable of occupying interstitial sites in the crystal lattice are selected from the group comprising N + , C + and B + ions.
Claim 4
Dependent Claim
21 words
A method according to claim 1 wherein the reactive metals are selected from the group comprising titanium, tantalum, zirconium, and hafnium.
Claim 5
Dependent Claim
25 words
A method according to claim 1, wherein the reactive ions are selected from the group comprising N + , B + and CO + .
Claim 6
Dependent Claim
46 words
A method according to claim 1 wherein the initial ion bombardment is carried out with ion energies in the range 100-150 KeV, and the final operation is commenced with ion energies in the range 100-150 KeV, and finished with ion energies in the range 10-30 KeV.
Claim 7
Dependent Claim
52 words
A method according to claim 1 wherein there is included the operation of implanting ions of a material which are oversized in relation to the crystal lattice of the material of the said body simultaneously with the ions which are capable of occupying interstitial sites in the crystal lattice of the body.
Claim 8
Dependent Claim
21 words
A method according to claim 2 wherein the reactive metals are selected from the group comprising titanium, tantalum, zirconium, and hafnium.
References Cited (Backward Citations)
GB1380583A
Cited
US3900636A
Cited
US3832219A
Cited
AT326971B
Cited
GB1423412A
Cited
US4105443A
Cited
US4465524A
Cited
GB2073254A
Cited
US4532149A
Cited
US4486247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |