DocumentCode :
1429751
Title :
Properties of 
Tapes Prepared by Using MA In-Ex Situ Powder
Author :
Kario, A. ; Hasler, W. ; Herrmann, M. ; Rodig, C. ; Scheiter, J. ; Holzapfel, B. ; Schultz, L. ; Schlachter, S. ; Ringsdorf, B. ; Goldacker, W. ; Morawski, A.
Author_Institution :
Inst. for Metallic Mater., IFW Dresden, Dresden, Germany
Volume :
20
Issue :
3
fYear :
2010
fDate :
6/1/2010 12:00:00 AM
Firstpage :
1521
Lastpage :
1523
Abstract :
MgB2 single-filament tapes and wires with Monel/Nb sheath were produced by the Powder in Tube (PIT)-technique using MA in-ex situ powder. This powder prepared by mechanical alloying (MA) of Mg and B was finally reacted to MgB2 at 700??C. The amount of MgB2 after annealing was about 91 wt%. Additionally 9 wt% MgO secondary phase was found. The primary crystallite size was about 25 nm. Critical current density measurements have shown relatively high values of Jc = 104 A/cm2 at 6.7 T for unsintered tapes in parallel magnetic field. Heat treatment at temperatures of up to 900??C could not improve these values, probably due to MgO hindering the sintering process.
Keywords :
annealing; critical current density (superconductivity); magnesium compounds; mechanical alloying; niobium; powders; superconducting magnets; superconducting tapes; type II superconductors; MA in-ex situ powder; MgB2; MgB2 single-filament tapes; MgB2 single-filament wires; MgB2 tapes preparation; MgO; MgO secondary phase; MgO sintering hindrance; Monel/Nb sheath; annealing; critical current density measurements; heat treatment; magnetic flux density 6.7 T; parallel magnetic field; powder in tube-technique; primary crystallite size; temperature 700 degC; unsintered tapes; Ex situ ; ${rm MgB}_{2}$ in-ex situ ; mechanical alloying; tapes; wires;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2009.2039777
Filename :
5422796
Link To Document :
