Some effects of matrix additions to internal tin processed multifilamentary Nb/sub 3/Sn superconductors

Author

Pyon, T. ; Gregory, E.

Author_Institution

IGC Adv. Superconductors, Waterbury, CT, USA

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

1760

Lastpage

1763

Abstract

Internal tin processed Nb/sub 3/Sn multifilamentary wires were fabricated with matrices containing either Ti or Ge. Some effects of these matrix additions on the formation rate of Nb/sub 3/Sn and on the J/sub c/´s obtained, have been determined. The effect of a 0.7 wt.% Ge addition on material with Nb 1 wt.% Ta, Nb 7.5 wt.% Ta and pure Nb filaments has been examined as has that of three different levels of Ti in the Cu matrix with the filament compositions. The tubular-tin-source (TTS) process was chosen for this work, because this process was believed to be less sensitive to the hardness of the matrix than the tin-core process. In this study, three different reaction heat treatments were carried out to explore the variation of J/sub c/ of these materials. A discussion of the results and significant effects of the addition elements is given.<>

Keywords

alloying additions; critical current density (superconductivity); germanium alloys; heat treatment; multifilamentary superconductors; niobium alloys; tin alloys; titanium alloys; work hardening; Nb/sub 3/Sn; Nb/sub 3/Sn multifilamentary wires; Nb/sub 3/Sn-Cu; Nb/sub 3/Sn-Ge; Nb/sub 3/Sn-Ti; critical current density; filament composition; formation rate; internal tin processing; matrix additions; multifilamentary Nb/sub 3/Sn superconductors; reaction heat treatments; tubular-tin-source process; work hardening; Composite materials; Copper; Grain size; Heat treatment; Multifilamentary superconductors; Niobium; Niobium-tin; Speech synthesis; Superconducting materials; Tin;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402919

Filename

402919