US3988178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing superconductors
Assignee: Energy Research and Development Administration ERDA
•
Filing: 1974-11-29
•
Granted: 1976-10-26
•
Expires: 1994-11-29
Abstract
Abstract A superconductor having an equiaxed fine grain beta-tungsten crystalline structure found to have improved high field critical current densities is prepared by sputter-depositing superconductive material onto a substrate cooled to below 200 DEG C. and heat-treating the deposited material.
Inventors
- 👤 Shelley D. Dahlgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:27
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/16; C22F1/18; Y; Y10; Y10S; Y10S420/00; Y10S420/901; Y10S505/00; Y10S505/80; Y10S505/801; Y10S505/805; Y10S505/806; Y10S505/815; Y10S505/816; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12819; Y10T428/12826; Y10T428/12861; Y10T428/12903; Y10T428/12951; Y10T428/12972; Y10T428/12979
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
129 words
A method for preparing a superconductor having an equiaxial fine-grain beta-tungsten structure comprising: a. sputtering superconductive material selected from the group consisting of Nb 3 Al, Nb 3 Al 0 .75 Ge 0 .25, Nb 3 Ga, Nb 3 Sn and V 3 Ga, under a partial pressure of inert gas onto a substrate selected from the group consisting of copper, stainless steel, niobium and tungsten, cooled to and maintained from about 10 to 20° C. to deposit a layer of superconductive material thereon, said deposit having generally a body-centered-cubic type crystal structure, and b. heating the deposit of superconductive material to from 550° to 950° C. for a period of time sufficient to transform the body-centered-cubic type crystal structure into an equiaxial fine-grain beta-tungsten structure having superconductive properties.
Claim 2
Independent Claim
129 words
A method for preparing a superconductor having an equiaxial fine-grain beta-tungsten structure comprising: a. sputtering superconductive material selected from the group consisting of Nb 3 Al, Nb 3 Al 0 .75 Ge 0 .25, Nb 3 Ga, Nb 3 Sn and V 3 Ga, under a partial pressure of inert gas onto a substrate selected from the group consisting of copper, stainless steel, niobium and tungsten, cooled to and maintained from about 10 to 20° C. to deposit a layer of superconductive material thereon, said deposit having generally a body-centered-cubic type crystal structure, and b. heating the deposit of superconductive material to from 550° to 950° C. for a period of time sufficient to transform the body-centered-cubic type crystal structure into an equiaxial fine-grain beta-tungsten structure having superconductive properties.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein the layer of superconductive material is heated for a period of from 1 hour to 20 days.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein the superconductive material is Nb 3 Al.
Claim 5
Dependent Claim
24 words
The method of claim 3 wherein the layer of superconductive material is heated for a period of from 1 hour to about 20 days.
Claim 6
Dependent Claim
18 words
The method of claim 1 wherein the superconductive material is Nb 3 Al 0 .75 Ge 0 .25.
Claim 7
Dependent Claim
24 words
The method of claim 5 wherein the layer of superconductive material is heated for a period of from 1 hour to about 20 days.
Claim 8
Dependent Claim
28 words
The method of claim 1 wherein the superconducting material is Nb 3 Al, and the layer of superconducting material is heated to 750° C. for about 5 days.
Claim 9
Dependent Claim
34 words
The method of claim 1 wherein the superconducting material is Nb 3 Al 0 .75 Ge 0 .25, and the layer of superconducting material is heated to about 750° C. for about 5 days.
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) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |