Title :
The effect of Mn additions on the hysteresis loss and critical current density of power-metallurgy processed superconducting Nb/sub 3/Sn wires
Author :
Mizomata, Y. ; Matsukura, N. ; Inoue, Y. ; Shimada, M. ; Ogawa, R. ; Kawate, Y.
fDate :
3/1/1993 12:00:00 AM
Abstract :
Powder-metallurgy processed Nb/sub 3/Sn conductors were fabricated using a (Cu-1 or 3 wt.% Mn)-22.5 wt.%Nb composite. Plasma rotating electrode processed powders were used to improve workability. The Mn addition to the matrix increased the critical current density. The overall critical current density was about 1.5 approximately 2 times higher than that of conductors without Mn addition. It was found that Mn addition enhanced the reaction rate of Nb/sub 3/Sn through a catalysis-like effect of Mn. The Mn addition to the matrix decreased the hysteresis loss and the effective filament diameter. The lowest hysteresis loss was about 60% of the value of conductors without Mn addition. It was found that Mn addition depressed interfilamentary coupling.<>
Keywords :
alloying additions; composite superconductors; critical current density (superconductivity); magnetic hysteresis; niobium alloys; powder metallurgy; tin alloys; type II superconductors; Nb/sub 3/Sn-Mn; catalysis-like effect; critical current density; effective filament diameter; hysteresis loss; interfilamentary coupling; power-metallurgy processed; reaction rate; superconducting Nb/sub 3/Sn wires; Conducting materials; Conductors; Critical current density; Hysteresis; Niobium; Powders; Steel; Superconducting filaments and wires; Superconducting materials; Tin;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
