USH39H
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer super-conducting shield and method of manufacturing same
Assignee: United States Department of the Navy
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Filing: 1985-08-05
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Granted: 1986-03-04
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Expires: 2005-08-05
Abstract
Abstract A multi-layer superconducting shield for shielding superconducting electronic devices from stray magnetic fields. In one embodiment the shield of the present invention comprises alternating concentric layers of a transition metal having a high transition temperature and a metal alloy formed from copper and a non-transition metal, said transition metal and metal alloy forming an interface, and a layer of A 3 B-compound structure metal at the interface of said transition metal and metal alloy. The A 3 B-compound structure metal is a high transition temperature superconductor. In a second embodiment the superconducting shield comprises a thin film of a high transition temperature superconducting nitride compound deposited on a cylindrical substrate. The nitride is deposited by reactive rf sputtering.
Inventors
- 👤 Donald U. Gubser
- 👤 Stuart A. Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:03
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0075; H05K9/0077; H10; H10N; H10N60/00; H10N60/20
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
65 words
A multilayer superconductor shield which comprises: alternating concentric layers of a transition metal having a high transition temperature and a metal alloy formed from copper and a non-transition metal, said transition metal and metal alloy forming an interface; and a layer of A 3 B-compound structure metal at the interface of said metals, said A 3 B-compound structure metal being a high transition temperature superconductor.
Claim 2
Dependent Claim
65 words
A multilayer superconductor shield which comprises: alternating concentric layers of a transition metal having a high transition temperature and a metal alloy formed from copper and a non-transition metal, said transition metal and metal alloy forming an interface; and a layer of A 3 B-compound structure metal at the interface of said metals, said A 3 B-compound structure metal being a high transition temperature superconductor.
Claim 3
Dependent Claim
22 words
The multilayer superconductor shield of Claim 1, wherein said transition metal is chosen from the group consisting of vanadium, niobium, and tantalum.
Claim 4
Dependent Claim
21 words
The multilayer superconductor shield of claim 2, wherein said non-transition metal is chosen from the group consisting of gallium and tin.
Claim 5
Dependent Claim
43 words
A multilayer superconductor shield as claimed in claim 1, wherein said transition metal is niobium and said copper and non-transition metal alloy is copper-tin bronze and said A 3 B-compound structure metal at the interface between said first and second metals is niobium-tin.
Claim 6
Dependent Claim
43 words
A multilayer superconductor shield as claimed in claim 1, wherein said transition metal is vanadium and said copper and non-transition metal alloy is copper-gallium bronze and said A 3 B-compound structure metal at the interface between said first and second metals is vanadium-gallium.
Claim 7
Independent Claim
117 words
A method of manufacturing a high transition temperature superconducting shield, comprising the steps of: wrapping alternating sheets of a transition metal and a copper and non-transition metal alloy around a mandrel, said transition metal having a high transition temperature; extruding said wrapped sheets to form a rod of a desired diameter, said wrapped sheets being cold welded by said extrusion process and said sheets forming an interface; reacting said extruded rod within a temperature range of 700° C. and 800° C. to form a layer of A 3 B-compound structure metal at the interface of said transition metal and said copper and non-transition metal alloy, said A 3 B-compound structure metal being a high transition temperature superconductor.
Claim 8
Independent Claim
117 words
A method of manufacturing a high transition temperature superconducting shield, comprising the steps of: wrapping alternating sheets of a transition metal and a copper and non-transition metal alloy around a mandrel, said transition metal having a high transition temperature; extruding said wrapped sheets to form a rod of a desired diameter, said wrapped sheets being cold welded by said extrusion process and said sheets forming an interface; reacting said extruded rod within a temperature range of 700° C. and 800° C. to form a layer of A 3 B-compound structure metal at the interface of said transition metal and said copper and non-transition metal alloy, said A 3 B-compound structure metal being a high transition temperature superconductor.
Claim 9
Dependent Claim
30 words
A method of manufacturing a high transition temperature superconducting shield, as claimed in claim 6, wherein said transition metal is chosen from the group consisting of niobium, vanadium and tantalum.
Claim 10
Dependent Claim
29 words
A method of manufacturing a high transition temperature superconducting shield, as claimed in claim 7, wherein said non-transition metal is chosen from the group consisting of gallium and tin.
Claim 11
Dependent Claim
20 words
The method of claim 6 wherein said reacting step is performed within the range of 740° C. and 760° C.
Claim 12
Independent Claim
122 words
A method of manufacturing superconducting shields of transition metals having high transition temperatures for use in magnetic shielding applications by the process of reactive rf sputtering, comprising the steps of: providing a clean conventional vacuum sputtering chamber, said chamber prepumped to a pressure of approximately 3×10 -9 torr; backfilling said vacuum chamber with high purity argon to a pressure of approximately 50×10 -3 torr; providing a sputtering target of niobium; suspending a rotatable substrate within said vacuum chamber; and igniting the aron to start the reacting process; injecting nitrogen into the vacuum sputtering chamber thereby depositing niobium nitride onto said rotating substrate, said niobium nitride deposited at a power density of about 15 watts-cm -3 to a thickness of approximately 1 micron.
Claim 13
Independent Claim
122 words
A method of manufacturing superconducting shields of transition metals having high transition temperatures for use in magnetic shielding applications by the process of reactive rf sputtering, comprising the steps of: providing a clean conventional vacuum sputtering chamber, said chamber prepumped to a pressure of approximately 3×10 -9 torr; backfilling said vacuum chamber with high purity argon to a pressure of approximately 50×10 -3 torr; providing a sputtering target of niobium; suspending a rotatable substrate within said vacuum chamber; and igniting the aron to start the reacting process; injecting nitrogen into the vacuum sputtering chamber thereby depositing niobium nitride onto said rotating substrate, said niobium nitride deposited at a power density of about 15 watts-cm -3 to a thickness of approximately 1 micron.
Claim 14
Dependent Claim
25 words
The method of claim 10 including the additional step of heating said substrate to improve the crystallization process of the niobium nitride on the substrate.
Claim 15
Dependent Claim
31 words
The method of claim 10 including the additional step of precleaning said niobium target in an argon plasma at a power density of approximately 5 watts-cm -3 for approximately 15 minutes.
Claim 16
Independent Claim
125 words
A method of manufacturing superconducting shields of transition metals having high transition temperatures for use in magnetic shielding applications by the process of reactive rf sputtering, comprising the steps of: providing a clean conventional vacuum puttering chamber, said chamber prepumped to a pressure of approximately 3×10 -9 torr; backfilling said vacuum chamber with high purity argon to a pressure of approximately 50×10 -3 torr; providing a sputtering target of niobium; suspending a rotatable substrate within said vacuum chamber; and igniting the argon to start the reacting process; injecting nitrogen and carbon into the vacuum sputtering chamber thereby depositing niobium carbonitride onto said rotating substrate, said niobium carbonitride deposited at a power density of about 15 watts-cm 31 3 to a thickness of approximately 1 micron.
Claim 17
Independent Claim
125 words
A method of manufacturing superconducting shields of transition metals having high transition temperatures for use in magnetic shielding applications by the process of reactive rf sputtering, comprising the steps of: providing a clean conventional vacuum puttering chamber, said chamber prepumped to a pressure of approximately 3×10 -9 torr; backfilling said vacuum chamber with high purity argon to a pressure of approximately 50×10 -3 torr; providing a sputtering target of niobium; suspending a rotatable substrate within said vacuum chamber; and igniting the argon to start the reacting process; injecting nitrogen and carbon into the vacuum sputtering chamber thereby depositing niobium carbonitride onto said rotating substrate, said niobium carbonitride deposited at a power density of about 15 watts-cm 31 3 to a thickness of approximately 1 micron.
Claim 18
Dependent Claim
20 words
A superconductor shield which comprises a thin film of a high transition temperature superconductingnitride compound formed by reactive rf sputtering.
Claim 19
Dependent Claim
20 words
A superconductor shield which comprises a thin film of a high transition temperature superconductingnitride compound formed by reactive rf sputtering.
Claim 20
Dependent Claim
19 words
A superconductor shield as claimed in claim 14, wherein said high transition temperature superconducting nitride compound is niobium nitride.
Claim 21
Dependent Claim
19 words
A superconductor shield as claimed in claim 14, wherein said high transition temperature superconducting nitride compound is niobium carbonitride.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-03 | 1989-09-02 | 1990-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-03 | 1993-09-02 | 1994-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-03 | 1997-09-02 | 1998-03-04 | $7700.00 | Window Closed / Lapsed |