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Primary Examiner: Kendall, Ralph S.
Assistant Examiner: Smith, John D.
Attorney: Kenyon & Kenyon, Reilly, Carr & Chapin

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Title: Method for preparing superconductive Nb.sub.3 Sn layers on niobium surfaces for high-frequency applications

Abstract: A method for preparing superconductive Nb.sub.3 Sn layers on niobium surfaces for high frequency applications in which a defined reaction zone which contains a tin source and the niobium surface is formed in an open reaction chamber and sealed off to the extent that, while interfering gases are being drawn off from the reaction zone during the evacuation, the vapor pressure of the tin remains higher within the reaction zone, when heated, than in the rest of the chamber. While pumping continuously, the reaction zone is then heated to a temperature between 930.degree. and 1400.degree. C and held at this temperature until an Nb.sub.3 Sn layer 0.5 to 5 .mu.m thick is formed on the niobium surface.

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Inventors: Martens, Hans (Erlangen, DT)
Hillenbrand, Bernhard (Erlangen, DT)

Application Number: 705418
Filing Date: 1976-07-15
Publication_date: 1978-03-28
Assignee: Siemens Aktiengesellschaft (Munich, DT)
Primary Class(es): 427/62 29/599, 118/715, 228/262.7, 331/96, 331/107S, 427/124, 427/250, 427/295, 505/819
Other Classes:
US Patent Ref:

3085913	Apr, 1963	Caswell	427/250.
3213825	Oct, 1965	Cooper et al.	118/49.
3332800	Jul, 1967	Saur	427/62.
3346467	Oct, 1967	Allen	29/599.
3468021	Sep, 1969	Maier	29/599.
3493809	Feb, 1970	Weissman	29/599.
3533919	Oct, 1970	Prior	427/250.
3576670	Apr, 1971	Hammond	427/250.
3661639	May, 1972	Caslaw	427/62.

Other Refs: Other References: Hillenbrand et al., "Superconducting Nb.sub.3 Sn-Cavities," IEEE Transactions on Magnetics, vol. MAG-II, No. 2, Mar. 1975.