日本金属学会誌

J. Japan Inst. Metals, Vol. 71, No. 11 (2007),
pp. 966-971

Fabrication of Superconducting Alloy Wires by Clad-Chip Extrusion Method

Sakae Saito1, Takao Yamazaki1, Yutaka Ando1, Yuji Kubo1, Yukio Konno1, Takao Takeuchi2, Nobuya Banno2, Akihiro Kikuchi2, Yasuo Iijima2 and Shigeki Nimori3

1Department of Mechanical Engineering, Faculty of Engineering, Ashikaga Institute of Technology, Ashikaga 326-8558
2Superconducting Materials Center, National Institute for Materials Science, Tsukuba 305-0047
3High Magnetic Field Station, National Institute for Materials Science, Tsukuba 305-0003

Abstract:

This paper describes a new fabrication process of V-Ti and Nb-Ti superconducting alloy wires by the clad-chip extrusion (CCE) method. It is one of unique fabrication method of alloy wire without melting and casting process. The CCE method is characterized by the extrusion of thin chips of metal-clad sheet. Its chemical composition is controlled by the thickness ratio of the layers of constituent metals at clad-rolling. The CCE method produces the segregation-free composite because each chip is regarded as the deformation element with the intended chemical composition. The CCE-processed precursor wires with fine-layered structure of constituent metals are then converted to the alloys with the intended chemical composition by the heat treatment of solid state diffusion. The finally obtained wires are measured the critical transition temperature Tc and the critical current density Jc at 4.2 K under the applied magnetic field up to 9 T.
The present experiments showed that V-Ti and Nb-Ti superconducting wires were successfully fabricated by the CCE method and the following diffusive heat treatment. Their superconducting properties were measured as follows; (1) 7.82 K of Tc and 80 A/mm2 of Jc at 6 T for the V-Ti wire. (2) 10.0 K of Tc and 100 A/mm2 of Jc at 8 T for the Nb-Ti wire.


(Received 2007/5/28)

Keywords:

superconducting alloy, vanadium-titanium wire, niobium-titanium wire, clad-chip extrusion method, critical temperature, critical current density


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