Low resistivity joints for joining wires and methods for making the same

a technology of low resistivity and joints, which is applied in the direction of superconductor details, superconductor devices, connection contact members, etc., can solve the problems of using this technology for applications, achieving the very high operating field and critical current values of magnesium diboride, and achieve the effect of low resistivity

Inactive Publication Date: 2008-10-02
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]In accordance with another aspect of the present technique, there is provided a superconductive wire. The superconductive wire comprises a first wire segment having superconductive filaments comprising magnesium diboride. The wire further comprises

Problems solved by technology

However, the existing methods of making these powders prevent magnesium diboride from achieving the very high operating fields and critical current values, particularly, when

Method used

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  • Low resistivity joints for joining wires and methods for making the same
  • Low resistivity joints for joining wires and methods for making the same
  • Low resistivity joints for joining wires and methods for making the same

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Embodiment Construction

[0020]Referring now to FIG. 1, a magnetic resonance imaging (MRI) system 10 is illustrated diagrammatically as including a scanner 12, scanner control circuitry 14, and system control circuitry 16. While MRI system 10 may include any suitable MRI scanner or detector, in the illustrated embodiment the system includes a full body scanner comprising a patient bore 18 into which a table 20 may be positioned to place a patient 22 in a desirable position for scanning. Scanner 12 may be of any suitable type of rating, including scanners varying from 0.5 Tesla ratings to 1.5 Tesla ratings and beyond.

[0021]Scanner 12 includes a series of associated coils for producing controlled magnetic fields, for generating radiofrequency excitation pulses, and for detecting emissions from gyromagnetic material within the patient in response to such pulses. In the diagrammatical view of FIG. 1, a primary magnet coil 24 is provided for generating a primary magnetic field generally aligned with patient bore...

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Abstract

Method for joining wires using low resistivity joints is provided. More specifically, methods of joining one or more wires having superconductive filaments, such as magnesium diboride filaments, are provided. The wires are joined by a low resistivity joint to form wires of a desired length for applications, such in medical imaging applications.

Description

BACKGROUND[0001]The invention relates generally to methods of the formation of persistent joints in superconducting wires, and more specifically, to the formation of persistent joints in magnesium diboride wires.[0002]Typically, magnesium diboride is employed as a superconductor in applications such as magnetic resonance imaging (MRI), generators, motors and fault current limiters. Advantageously, magnesium diboride powders display very strongly linked current flows having large critical current densities (Jc) on the order of 107 A / cm2 in thin films. Additionally, magnesium diboride powders in the shape of wires, tapes or ribbons display Jc values on the order of 105 A / cm2. Further, the upper critical fields (Hc) and irreversibility fields (Hirr) of these powders are greater than about 30 Tesla in thin films.[0003]Typically, magnesium diboride powders are formed by the reaction of elemental magnesium and boron. The result of this process is the production of a fine powder that exhib...

Claims

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Application Information

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IPC IPC(8): H01L39/02H01B12/00
CPCH01L39/02H01R4/68Y10T29/49194Y10T29/49014H01R13/03H10N60/80
Inventor MARTE, JUDSON SLOANHUANG, XIANRUILASKARIS, EVANGELOS TRIFONKNUDSEN, BRUCE ALANRABER, THOMAS ROBERTZABALA, ROBERT JOHNBRAY, JAMES WILLIAMTHOMPSON, PAUL SHADFORTHLOUREIRO, SERGIO PAULO MARTINSJOHNSON, CURTIS ALANDECARR, SYLVIA MARIE
Owner GENERAL ELECTRIC CO
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