NDLI: Evaluation of Electrical Properties of Lap Joints for BSCCO and YBCO Tapes

Content Provider	IEEE Xplore Digital Library
Author	Baldan, C.A. Oliveira, U.R. Shigue, C.Y. Filho, E.R.
Copyright Year	2002
Abstract	The joint process between tapes of coated conductors is a critical issue for the most of the applications of high temperature superconductors (HTS). Using different fabrication techniques joints of YBCO coated superconductors were prepared and characterized through electrical measurements. For soldering material low melting point eutectic alloys, such as In-Sn (m.p. 116degC) and Sn-Pb (m.p. 189degC) were selected to prepare lap joints with effective length between 1 to 20 cm. The splice resistance and the critical current of the joints were evaluated by I-V curve measurements with the maximum current strength above the critical current, in order to evaluate the degree of degradation for each joint method. Pressed lap joints prepared with tapes without external reinforcement presented low resistance lap joint nevertheless some critical current degradation occurs when strong pressing is applied. When mechanical pressure is applied during the soldering process we can reduce the thickness of the solder alloy and a residual resistance arises from contributions of high resistivity matrix and external reinforcement. The lap joints for reinforced tape were prepared using two methods: the first, using ldquoas-suppliedrdquo tape and the other after reinforcement-removal; in the latter case, the tapes were resoldered using Sn-Pb alloy. The results using several joint geometries, distinct surface preparation processes and different soldering materials are presented and analysed. The solder alloy with lower melting point and the longer joint length presented the smallest joint resistance.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2831
Ending Page	2834
Page Count	4
File Size	159096
File Format	PDF
ISSN	10518223
Volume Number	19
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Bismuth compounds Yttrium barium copper oxide High temperature superconductors Soldering Critical current Conducting materials Electrical resistance measurement Joining materials Degradation Fabrication low resistance lap joint HTS tapes joint length
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Electrical and Mechanical Characterization of Coated Conductors Lap Joints

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Lap Joint Characteristics of the YBCO Coated Conductors Under Axial Tension

Analytical Formulation of $I_{c}$ Dependence on Torsion of YBCO and BSCCO Conductors

Evaluation of Electrical Properties of Lap Joints for BSCCO and YBCO Tapes

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Transport alternating current losses of BSCCO and YBCO tapes

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