Contraction pre-annealing superconducting wire for length stabil

Details Contraction pre-annealing superconducting wire for length stabil Contraction pre-annealing superconducting wire for length stabil

1989-03-31

1991-01-08

Roy, Upendra

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

29599, 428930, 148 115F, 148154, H01L 3908, H01L 3924, H01B 1300

Patent

active

049832280

ABSTRACT:
A method for contraction annealing niobium-tin wire is disclosed. An improved niobium-tin wire is provided by loosely winding the wire on a mandrel, or by coiling the wire on a circumferentially retractile mandrel, and contraction annealing the wire without reaction-forming substantial amounts of Nb.sub.3 Sn. Such contraction annealing allows the wire to contract in length unconstrained thereby preventing the formation of internal tensile stresses in the wire and its surrounding insulation. Prevention of internal stresses in the wire greatly reduces the susceptibility of the wire to breakage, cracking, sintering, shorting, tin leakage, or substantial shifting of the wire from desired wrap positions when it is reaction annealed to form the brittle superconducting intermetallic compound Nb.sub.3 Sn.

REFERENCES:
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patent: 4040173 (1977-08-01), McDougall
patent: 4186039 (1980-01-01), Bache et al.
patent: 4343867 (1982-08-01), Luhman et al.
patent: 4376662 (1983-03-01), Brimm
patent: 4447946 (1984-05-01), Marancik
patent: 4505762 (1985-03-01), Fukutsuka et al.

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