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A kind of preparation method of multi-core mgb2 superconducting wire/tape

A technology of superconducting wires and strips, applied in the usage of superconducting elements, superconducting/high-conducting conductors, superconducting devices, etc. Inertness, reduced diffusion behavior, reduced effect of disconnection

Active Publication Date: 2011-12-14
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because many sheath materials include commonly used Nb, Fe, etc., when the heat treatment temperature is high (greater than 750 degrees), the sheath material will chemically react with Mg or B to form a certain thickness of the diffusion layer. It will inhibit the critical current density of the wire / strip, and it is difficult for the carbon atoms in the SiC dopant to replace the boron atoms due to the low heat treatment temperature, and the SiC dopant can only exist as a two-phase particle at the grain boundary It is difficult to significantly increase the critical current density of the wire / ribbon under high field

Method used

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  • A kind of preparation method of multi-core mgb2 superconducting wire/tape
  • A kind of preparation method of multi-core mgb2 superconducting wire/tape
  • A kind of preparation method of multi-core mgb2 superconducting wire/tape

Examples

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Embodiment 1

[0035] 7-core MgB 2 Preparation of superconducting wires:

[0036] Step 1. Magnesium powder (particle size is -325 mesh, mass purity is 99.8%), amorphous boron powder (mass purity is 99%) and submicron SiC powder (mass purity is 99%, particle size is not more than 1 μ m) according to The atomic ratio of Mg: B: SiC=1: 3.96: 0.04 is batched, mixed evenly and pressed into a block, and then the block is placed in an argon-hydrogen mixed atmosphere (the volume percentage of argon in the argon-hydrogen mixed atmosphere is 92%) , the balance is hydrogen), under the protection of 900 ° C for 2 hours, after cooling, use an agate mortar to manually crush the block for 20 minutes, put the crushed block into an agate jar, and mix the crushed block with agate The mass ratio of the balls is 1:10, put into the agate ball, and add ethanol whose mass is 1 / 4 of the mass of the crushed block, and ball mill at a speed of 300rpm for 60min, and put the ball milled block into a 200-mesh filter siev...

Embodiment 2

[0043] 7-core MgB 2 Preparation of superconducting tape:

[0044] The preparation method of this embodiment is the same as that of Example 1, the difference being that the prepared 7-core wire rod is rolled into a 7-core strip at a pass processing rate of 10%, and then both ends of the 7-core strip are sealed. Be placed in vacuum furnace and carry out vacuum sintering (vacuum sintering condition is the same as embodiment 1), obtains that thickness is 0.4mm, and width is the kilometer level 7 core MgB of 4.0mm 2 superconducting tape.

[0045] In this embodiment, the conductor structure reinforced by the central copper-niobium composite rod is beneficial to improve the MgB 2 The density of superconducting core wire effectively strengthens MgB 2 The connectivity of the crystal grains increases the critical current density of the strip, which is more suitable for the preparation of practical kilometer-level multi-core strips. The kilometer-level 7-core MgB prepared in this exa...

Embodiment 3

[0047] 13-core MgB 2 Preparation of superconducting wires:

[0048] Step 1. Magnesium powder (particle size is -325 mesh, mass purity is 99.8%), amorphous boron powder (mass purity is 99%) and submicron SiC powder (mass purity is 99%, particle size is not more than 1 μ m) according to The atomic ratio of Mg: B: SiC=1: 3.8: 0.2 is batched, mixed uniformly and pressed into a block, and then the block is placed in an argon-hydrogen mixed atmosphere (the volume percentage of argon in the argon-hydrogen mixed atmosphere is 96%) , the balance is hydrogen), under the protection of 950 ° C for 1 hour, after cooling, use an agate mortar to manually crush the block for 30 minutes, put the crushed block into an agate jar, and mix the crushed block with agate The mass ratio of the balls is 1:15, put into the agate ball, and add ethanol whose mass is 1 / 3 of the mass of the crushed block, and mill at a speed of 400 rpm for 30 minutes, and put the milled block into a 325-mesh filter sieve ...

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Abstract

The invention discloses a preparation method for a multi-core MgB2 superconducting wire / band. The method comprises the following steps of: 1, preparing precursor powder; 2, feeding the precursor powder into a Nb / Cu composite metal tube to obtain a tubing complex; 3, performing rotary swaging and drawing treatment, and thus obtaining single-core wires; 4, placing a copper-niobium composite rod anda plurality of single-core wires into an anaerobic copper tube for secondary assembly to obtain a secondary composite rod, performing the rotary swaging and drawing treatment, and thus obtaining multi-core wires; and 5 sintering in vacuum, and thus obtaining the multi-core MgB2 superconducting wire; or rolling into multi-core bands, then sintering in vacuum, and thus obtaining the multi-core MgB2superconducting band. By the preparation method, powder is subjected to high-temperature heat treatment, so that the condition that high-activity carbon which is decomposed from SiC can better replace boron can be ensured, and the improvement on the critical current density of the wire / band in a magnetic field is better facilitated. Due to the adoption of a center copper-niobium composite bar enhanced conductor structure, the improvement on the density of the MgB2 superconducting wire is facilitated, the connectivity of MgB2 crystal grains is enhanced, and the critical current density of the wire / band is improved.

Description

technical field [0001] The invention belongs to the technical field of superconducting material processing engineering, and in particular relates to a multi-core MgB 2 Method for the preparation of superconducting wires / tapes. Background technique [0002] Center-enhanced kilometer-level multi-core MgB 2 The wire / strip structure includes four parts: superconducting core wire, outer copper niobium tube, secondary oxygen-free copper tube and central reinforcement core. The superconducting core wire carries the working current in superconducting state, and the outer copper niobium tube mainly acts as a chemical barrier As well as the effect of facilitating processing, the secondary oxygen-free copper tube mainly plays the role of shunting and stabilizing heat dissipation. The central reinforcing core can improve the mechanical strength of the wire / strip, avoid wire breakage caused by processing defects, and at the same time improve to a certain extent The density of the super...

Claims

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Application Information

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IPC IPC(8): H01B12/16H01B13/00C01B35/04C04B35/58C04B35/622
CPCY02E40/647Y02E40/60
Inventor 李成山刘国庆纪平熊晓梅王庆阳焦高峰闫果
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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