Production method for nb3sn superconducting wire rod, precursor for nb3sn superconducting wire rod, and nb3sn superconducting wire rod using same

A technology of superconducting wire rod and manufacturing method, which is applied in superconducting/high-conducting conductor, cable/conductor manufacturing, usage of superconducting element, etc. Effects of strain characteristics

Active Publication Date: 2019-12-24
NAT INST FOR MATERIALS SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the conventional internal tin method, there is a problem that large voids are generated after the central Sn core diffuses into the Cu base material, which impairs the mechanical properties of the wire.

Method used

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  • Production method for nb3sn superconducting wire rod, precursor for nb3sn superconducting wire rod, and nb3sn superconducting wire rod using same
  • Production method for nb3sn superconducting wire rod, precursor for nb3sn superconducting wire rod, and nb3sn superconducting wire rod using same
  • Production method for nb3sn superconducting wire rod, precursor for nb3sn superconducting wire rod, and nb3sn superconducting wire rod using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Follow the steps below to create image 3 The cross-sectional shape of the precursor is shown. First, a Cu-1Zn-5Ge bar material with an outer diameter of 30 mm (it should be noted that in this example, copper was arranged at the center to improve workability) was prepared as a base material 10 (S100). Next, a hole with an inner diameter of 2 mm was opened in the center of the base material 10 as a Nb insertion hole. Next, a total of 20 holes were drilled along the first outer circumference and the second outer circumference around the central hole as Sn insertion holes 12 . In addition, a total of 36 Nb insertion holes 14 are provided between the third outer periphery located on the outer periphery of the Sn insertion hole 12 and the fourth outer periphery that is inside the outer peripheral surface of the Cu-1Zn-5Ge rod material as the base material (S102). That is, there are 37 Nb insertion holes 14 in total.

[0085] Next, a Sn-2 mass % Ti alloy rod having a diame...

Embodiment 2

[0092] For a composite precursor wire with a wire diameter of 0.814mm prepared in the same way using the Cu-1Zn-10Ga alloy base material, after preheating at 650°C×100h in an Ar gas atmosphere, in order to generate Nb 3 The Sn layer is heat-treated at 750°C×100h.

[0093] As a result of composition distribution analysis, it was confirmed that Ga diffused into Nb after heat treatment 3 Sn layer. When the magnetization-temperature curve of this sample is measured by SQUID, if Figure 5 As shown, it was confirmed that the critical temperature for becoming a superconducting state increased by 0.3K compared to the case where Ga was not added.

Embodiment 3

[0095] For the composite precursor wire prepared in the same way using the Cu-0.2Zn-1Mg alloy base material, after preheating at 650℃×100h in an Ar gas atmosphere, in order to generate Nb 3 The Sn layer is heat-treated at 800°C×20h.

[0096] SEM observation was carried out on the fractured surface of the wire rod, and it was found that the average crystal grain size of the Cu base material without adding Mg was about 500 nm or more, while the coarsening of the crystal grains of the base material with Mg was suppressed, and the average grain size was . Around 300nm.

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Abstract

The present invention provides: a Nb3Sn superconducting wire rod that is produced by the internal tin process and that has a number of useful functions in such aspects as promotion of Nb3Sn layer generation, mechanical strength (and increase in interfacial resistance) of superconducting filaments, critical temperature (magnetic field), miniaturization of crystal grains, etc.; and a production method therefor. The Nb3Sn superconducting wire rod production method according to one embodiment of the present invention comprises: a step for providing a rod material 10 which has an alloy compositionrepresented by Cu-xZn-yM (where, x is 0.1-40 mass%; M=Ge, Ga, Mg or Al, provided that x is 0-40 mass% for Mg), and a central part of which is provided with a Sn insertion hole 12, and which has a plurality of Nb insertion holes 14 that are discretely disposed along the outer peripheral surface of the Sn insertion hole 12; a step for installing an alloy bar having an alloy composition of Sn-zQ (Q=Ti, Zr, Hf) in the Sn insertion hole 12, and inserting a Nb core in the Nb insertion holes 14; a step for reducing the diameter of the rod material 10 so as to prepare a Cu-xZn-yM / Nb / Sn-zQ composite multicore wire having a prescribed outer diameter; and a step for subjecting the composite multicore wire to a heat treatment for generating a Nb3Sn phase.

Description

technical field [0001] The present invention relates to a kind of Nb 3 Sn superconducting wires, especially a kind of Nb using inner tin method 3 A method for producing a Sn superconducting wire. In addition, the present invention relates to a suitable Nb 3 Nb used in the manufacturing method of Sn superconducting wire 3 Precursor for Sn superconducting wire and Nb using the precursor 3 Sn superconducting wire. Background technique [0002] Nb 3 Sn (niobium tritin) is an intermetallic compound of niobium (Nb) and tin (Sn), which is often processed into wire rods and used in superconducting magnets for nuclear fusion and nuclear magnetic resonance (NMR: Nuclear Magnetic Resonance) devices, etc. . [0003] Although Nb 3 Sn is more expensive than niobium titanium (NbTi), but from the viewpoint of the critical magnetic field Hc, it is about 15T relative to NbTi, and Nb 3 The magnetic field strength of Sn is as high as about 30T. In addition, Nb 3 Sn has a critical tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00C22C9/00C22C9/01C22C9/04C22C13/00C22C27/02C22F1/00C22F1/08C22F1/16H01B12/10
CPCC22C9/00C22C9/01C22C9/04C22C13/00C22C27/02C22F1/00C22F1/08C22F1/16H01B12/10Y02E40/60H10N60/0184C22F1/18Y10T428/12708Y10T428/12819Y10T428/12903
Inventor 伴野信哉太刀川恭治
Owner NAT INST FOR MATERIALS SCI
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