Title: Wrapped tantalum diffusion barrier

Abstract: A multifilamentary stabilized superconductor of the A-15 type is disclosed wherein the A-15 compound is formed on rods of niobium or vanadium by diffusion of tin or gallium, respectively, from a copper alloy matrix and wherein stabilization is provided by an external layer of copper. The stabilizing copper is protected from tin or gallium diffusion by a number of spirally wrapped layers of tantalum separated from one another by copper layers.

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Inventors: Young, Morris S. (Murray Hill, NJ, US)
Larbalestier, David C. (Madison, WI, US)

Application Number: 933302
Filing Date: 1978-08-14
Publication_date: 1980-05-27
Assignee: Airco, Inc. (Montvale, NJ)
Primary Class(es): 428/614 29/599, 174/15.5, 174/125.1, 174/155, 257/E39.017, 428/930, 505/812, 505/813, 505/823
Other Classes:
US Patent Ref:

3296684	Jan, 1967	Allen et al.	428/930.
3540114	Nov, 1970	Roberts et al.	29/599.
3570118	Mar, 1971	Reynolds et al.	428/930.
3579800	May, 1971	Packord	29/423.
3728165	Apr, 1973	Howlett	148/11.
3813764	Jun, 1974	Tonalia et al.	174/126.
3905839	Sep, 1975	Hashimoto	148/11.
3958327	May, 1976	Marancik et al.	29/599.
3996661	Dec, 1976	Ziegler et al.	29/599.

Other Refs: 13947241499507

May, 1975	GB.
Feb, 1978	GB.

Primary Examiner: Rutledge, L. Dewayne
Assistant Examiner: Lewis, Michael L.
Attorney: Bopp; Edmund W., Cassett; Larry R.