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

Patent · Fri Jan 01 00:00:00 EST 1993

OSTI ID:868850

Jablonski, Paul D ^[1]; Larbalestier, David C ^[1]

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1. Madison, WI

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.

• Research Organization: Univ. of Wisconsin, Madison, WI (United States)
• DOE Contract Number: AC02-82ER40077
• Assignee: Wisconsin Alumni Research Foundation (Madison, WI)
• Patent Number(s): US 5226947
• OSTI ID: 868850
• Country of Publication: United States
• Language: English

Related Subjects

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/