NDLI: Manufacture and superconductivity of tantalum matrix RHQT processed Nb/sub 3/Al superconductors

Content Provider	IEEE Xplore Digital Library
Author	Takeuchi, T. Tatsumi, N. Nimori, S. Kitaguchi, H. Banno, N. Iijima, Y. Kikuchi, A. Inoue, K.
Copyright Year	2002
Abstract	The replacement of Nb matrix with Ta for rapid-heating, quenching and transformation annealing (RHQT) processed Nb/sub 3/Al conductor seems to be advantageous for facilitating the RHQ operation due to a higher mechanical strength at elevated temperatures and less reactivity with the molten Ga in the quench bath and suppressing flux jumps in low magnetic fields. We have fabricated three grades of the Ta matrix precursor, in which the volume fraction of Ta matrix is different, so as to examine the drawability of such Ta matrix precursors. Also examined are the effects of using the Ta matrix on the RHQ condition, T/sub c/ values after quenching and subsequent annealing, respectively, J/sub c/ (core), overall residual resistivity, and magnetization curves. We have succeeded in drawing all of Ta matrix precursors and confirmed the favorable existence of a plateau region in the I/sub RHQ/-T/sub c/ relationship even for the Ta matrix RHQT Nb/sub 3/Al conductors. The resulting superconducting properties were comparative to those of Nb matrix conductors. The replacement of Nb matrix with Ta was very effective in suppressing flux jumps even at 4.2 K.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	3372
Ending Page	3375
Page Count	4
File Size	828155
File Format	PDF
ISSN	10518223
Volume Number	15
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Manufacturing processes Superconductivity Niobium Conductors Annealing Temperature Magnetic fields Magnetic cores Conductivity Magnetization workability Disappearance of flux jumps less reactivity with Ga RHQ condition
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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