Metal working – Method of mechanical manufacture – Electrical device making
Patent
1981-04-24
1985-08-06
Goldberg, Howard N.
Metal working
Method of mechanical manufacture
Electrical device making
148133, 148 2, 148127, 148 115Q, 75 10C, 219 69E, 174126S, 174126CP, 420495, H01L 3924
Patent
active
045327033
ABSTRACT:
An improved method of preparing composite multifilament superconducting wire of Nb.sub.3 Sn in a copper matrix which eliminates the necessity of coating the drawn wire with tin. A generalized cylindrical billet of an alloy of copper containing at least 15 weight percent niobium, present in the copper as discrete, randomly distributed and oriented dendritic-shaped particles, is provided with at least one longitudinal opening which is filled with tin to form a composite drawing rod. The drawing rod is then drawn to form a ductile composite multifilament wire containing a filament of tin. The ductile wire containing the tin can then be wound into magnet coils or other devices before heating to diffuse the tin through the wire to react with the niobium forming Nb.sub.3 Sn. Also described is an improved method for making large billets of the copper-niobium alloy by consumable-arc casting.
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patent: 3817746 (1974-06-01), Tsuei
patent: 3905839 (1975-09-01), Hashimoto
patent: 4002504 (1977-01-01), Howe
Tsuei et al., "Superconductivity of Copper Containing Small Amounts of Niobium" Journal of Material Sciences, 1973, pp. 1307-1314.
Tsuei, "Ductile Superconducting Copper-Rich Alloys Containing A-15 Filaments", IEEE Transactions on Magnetics, vol. MAG-111, No. 2, Mar. 1975, pp. 272-275.
Verhoeven et al., "Superconducting Properties on In-Situ Prepared Nb-Cu-Sn Alloys", Appl. Phys. Letters, 33, 101, 1978.
"Vast Savings Promised in Producing Magnets for Fusion Research", Mar. 1980, Industrial Research and Development, pp. 100-101.
Finnemore Douglas K.
Gibson Edwin D.
Ostenson Jerome E.
Owen Charles V.
Schmidt Frederick A.
Goldberg Howard N.
Hightower Judson R.
Rees Walter L.
Rising Vernon K.
The United States of America as represented by the United States
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