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Ceramic/metal and A15/metal superconducting composite materials exploiting the superconducting proximity effect and method of making the same

United States Patent

5,998,336
December 7, 1999
View the Complete Patent at the US Patent & Trademark Office
A composite superconducting material made of coated particles of ceramic superconducting material and a metal matrix material. The metal matrix material fills the regions between the coated particles. The coating material is a material that is chemically nonreactive with the ceramic. Preferably, it is silver. The coating serves to chemically insulate the ceramic from the metal matrix material. The metal matrix material is a metal that is susceptible to the superconducting proximity effect. Preferably, it is a NbTi alloy. The metal matrix material is induced to become superconducting by the superconducting proximity effect when the temperature of the material goes below the critical temperature of the ceramic. The material has the improved mechanical properties of the metal matrix material. Preferably, the material consists of approximately 10% NbTi, 90% coated ceramic particles (by volume). Certain aspects of the material and method will depend upon the particular ceramic superconductor employed. An alternative embodiment of the invention utilizes A15 compound superconducting particles in a metal matrix material which is preferably a NbTi alloy.
Holcomb; Matthew J. (Manhattan Beach, CA)
The Board of Trustees of the Leland Stanford Junior University (Palo Alto, CA)
08/ 806,697
February 26, 1997
The development of this invention was supported in part by grant number DEFG03-86ER45245-A012 from the U.S. Department of Energy. The United States Government has certain rights to the invention.