Development of Textured Buffer Layer on Metal Tapes for Oxide Superconductors

Period of Performance: 09/27/2002 - 09/27/2004

$600K

Phase 2 STTR

Recipient Firm

Ues, Inc.
4401 Dayton-Xenia Road Array
Dayton, OH 45432
Principal Investigator
Firm POC

Research Institution

Argonne National Laboratory
9700 South Cass Avenue
Lemont, IL 60439
Institution POC

Abstract

High current carrying conductors for various commercial and military applications can be fabricated by using a coating of high-temperature superconductor such as Yttrium-Barium-Copper-Oxide (YBCO) on a suitable metallic tape. It has been shown, however, that YBCO films deposited directly on polycrystalline metal substrates exhibit poor superconducting properties at liquid nitrogen temperature. A textured buffer layer on metal substrates is needed for the growth of YBCO films with a high critical current density. In Phase I, UES has demonstrated the feasibility of growing highly textured MgO films on polycrystalline substrates using inclined substrate deposition (ISD) technique. A multilayer architecture incorporating ISD MgO layer on metal substrates exhibited optimum properties of the overlaying YBCO films. In Phase II, UES proposes to further optimize the multilayer architecture and develop a pilot production process for coating long metal tapes. A reel-to-reel sputter deposition system at UES will be equipped with an electron beam evaporation source for this scale-up. Argonne National Laboratory and State University of New York, Albany will provide support in YBCO depositions and characterizations of coated conductors.