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Title: Niobium-titanium superconductors produced by powder metallurgy having artificial flux pinning centers

Abstract

Superconductors formed by powder metallurgy have a matrix of niobium-titanium alloy with discrete pinning centers distributed therein which are formed of a compatible metal. The artificial pinning centers in the Nb-Ti matrix are reduced in size by processing steps to sizes on the order of the coherence length, typically in the range of 1 to 10 nm. To produce the superconductor, powders of body centered cubic Nb-Ti alloy and the second phase flux pinning material, such as Nb, are mixed in the desired percentages. The mixture is then isostatically pressed, sintered at a selected temperature and selected time to produce a cohesive structure having desired characteristics without undue chemical reaction, the sintered billet is reduced in size by deformation, such as by swaging, the swaged sample receives heat treatment and recrystallization and additional swaging, if necessary, and is then sheathed in a normal conducting sheath, and the sheathed material is drawn into a wire. The resulting superconducting wire has second phase flux pinning centers distributed therein which provide enhanced J.sub.ct due to the flux pinning effects.

Inventors:
 [1];  [1]
  1. (Madison, WI)
Issue Date:
Research Org.:
UNIVERSITY OF WISCONSIN
OSTI Identifier:
868850
Patent Number(s):
5226947
Assignee:
Wisconsin Alumni Research Foundation (Madison, WI) OSTI
DOE Contract Number:  
AC02-82ER40077
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
niobium-titanium; superconductors; produced; powder; metallurgy; artificial; flux; pinning; centers; formed; matrix; alloy; discrete; distributed; therein; compatible; metal; nb-ti; reduced; size; processing; steps; sizes; coherence; length; typically; range; 10; nm; produce; superconductor; powders; centered; cubic; phase; material; nb; mixed; desired; percentages; mixture; isostatically; pressed; sintered; selected; temperature; time; cohesive; structure; characteristics; undue; chemical; reaction; billet; deformation; swaging; swaged; sample; receives; heat; treatment; recrystallization; additional; sheathed; normal; conducting; sheath; drawn; wire; resulting; superconducting; provide; enhanced; due; effects; flux pinning; coherence length; selected time; pinning centers; titanium alloy; chemical reaction; heat treatment; superconducting wire; processing steps; selected temperature; isostatically pressed; processing step; powder metallurgy; centered cubic; receives heat; provide enhanced; distributed therein; compatible metal; conducting wire; /75/252/419/420/428/505/

Citation Formats

Jablonski, Paul D., and Larbalestier, David C. Niobium-titanium superconductors produced by powder metallurgy having artificial flux pinning centers. United States: N. p., 1993. Web.
Jablonski, Paul D., & Larbalestier, David C. Niobium-titanium superconductors produced by powder metallurgy having artificial flux pinning centers. United States.
Jablonski, Paul D., and Larbalestier, David C. Fri . "Niobium-titanium superconductors produced by powder metallurgy having artificial flux pinning centers". United States. https://www.osti.gov/servlets/purl/868850.
@article{osti_868850,
title = {Niobium-titanium superconductors produced by powder metallurgy having artificial flux pinning centers},
author = {Jablonski, Paul D. and Larbalestier, David C.},
abstractNote = {Superconductors formed by powder metallurgy have a matrix of niobium-titanium alloy with discrete pinning centers distributed therein which are formed of a compatible metal. The artificial pinning centers in the Nb-Ti matrix are reduced in size by processing steps to sizes on the order of the coherence length, typically in the range of 1 to 10 nm. To produce the superconductor, powders of body centered cubic Nb-Ti alloy and the second phase flux pinning material, such as Nb, are mixed in the desired percentages. The mixture is then isostatically pressed, sintered at a selected temperature and selected time to produce a cohesive structure having desired characteristics without undue chemical reaction, the sintered billet is reduced in size by deformation, such as by swaging, the swaged sample receives heat treatment and recrystallization and additional swaging, if necessary, and is then sheathed in a normal conducting sheath, and the sheathed material is drawn into a wire. The resulting superconducting wire has second phase flux pinning centers distributed therein which provide enhanced J.sub.ct due to the flux pinning effects.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {1}
}

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