The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 11, 2003
Filed:
Aug. 28, 1997
Gregory Kozlowski, Centerville, OH (US);
Charles E. Oberly, Urbana, OH (US);
The United States of America as represented by the Secretary of the Air Force, Washington, DC (US);
Abstract
A new process for making a neodymium gallate (NGO) surface layer on the inside surface of a protective outer sheath of nickel surrounding a core of yttrium-based copper oxide (YBCO) superconductor material permits manufacture of very high performance superconducting wire and tape. The NGO surface layer acts as a diffusion barrier to prevent diffusion of nickel into the YBCO during high temperature melt-processing. The NGO is applied, preferably by slurry casting, to a flat strip of solid nickel and then sintered at temperatures above about 1000° C. The sintering binds the NGO to the nickel strip and fixes it so that it will not react chemically with the YBCO during later melt-processing. The nickel strip and NGO diffusion barrier layer are next rolled into a trough and YBCO ceramic powder inserted inside the trough. The trough is then further rolled into a tube leaving an open seam for oxygen to penetrate during the oxygen anneal procedure of melt-processing. Finally, the tube sheath acts as a crucible for melt-processing of the YBCO to complete the manufacture of a high performance superconducting wire.