DocumentCode :
1010465
Title :
Manufacturing of titanium-bronze processed multifilamentary Nb3Sn conductors
Author :
Kamata, K. ; Moriai, H. ; Tada, N. ; Fujinaga, T. ; Itoh, K. ; Tachikawa, K.
Author_Institution :
Metal Research Laboratory, Hitachi Cable Ltd. Ibaraki-Ken, Japan
Volume :
21
Issue :
2
fYear :
1985
fDate :
3/1/1985 12:00:00 AM
Firstpage :
277
Lastpage :
280
Abstract :
It has been revealed that small amount of titanium addition to the bronze matrix is most effective for improving the high-field current-carrying capacities of bronze-processed multifilamentary Nb3Sn conductor. Multifilamentary Nb/Cu-7.5 at %Sn-0.4 at %Ti round wires with 4-5 μm-diam 31×331-cores fabricated through drawing process only showed the overall critical current density Jc(overall) over 3.5 × 104A/cm2at 15 T after the heat treatment at 690°c for 200 hr. It was also shown that the critical current anisotropy became larger with increasing aspect ratio of the rectangular shaped multifilamentary Nb/Cu-7. 5Sn-0.4Ti conductors. Rectangular shaped 5 μm-diam 31 × 361-core Nb/Cu-7.5Sn- 0.45Ti conductors prepared through double extrusions showed about the same tendencies in the aspect ratio dependence of Ic( H_{\\parallel}) as those prepared through drawing process only, after the heat treatment at 690°C for 200 hr. 9.5 mm wide and 1.8 mm thick Nb/Cu-7.5Sn-0.4Ti conductors with 5 μm-diam 349 × 361-cores have been successfully fabricated in full production scale through three steps hydrostatic extrusion process. These rectangular shaped practical multifilamentary Ti bronze Nb3Sn conductors make feasible to generate a central magnetic field over 16 T in the 190 mm winding inner diameter intermediate coil of the 18 T superconducting magnet at NRIM.
Keywords :
Superconducting cables; Anisotropic magnetoresistance; Conductors; Critical current; Critical current density; Heat treatment; Manufacturing processes; Niobium; Tin; Titanium; Wires;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1985.1063838
Filename :
1063838
Link To Document :
بازگشت