High performance Fe/Cu wrapping structure magnesium diboride multiple core superconductive wire preparation method

A magnesium diboride, high-performance technology, applied in the field of magnesium diboride superconducting wire preparation, can solve the problems affecting the structure and performance of the superconducting wire core, the large amount of mechanical tensile deformation, and affecting the composite interface state, etc., to achieve It is convenient for industrial application, the effect of mechanical tensile resistance is large, and the equipment is easy to achieve

Inactive Publication Date: 2008-03-26
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main bottlenecks in the commercial application of magnesium diboride superconductivity are: 1) increasing the critical current density value under high magnetic field; 2) having good thermal stability; 3) preparing superconducting wires with small AC loss and mechanical resistance to tensile deformation large
In particular, the cross-sectional deformation rate of the single pass in the middle requires strict process control. The cross-sectional deformation rate not only affects the structure and performance of the superconducting wire core, but also affects the composite interface between Fe / Cu, thereby affecting the low-temperature thermal stability of the superconducting wire.

Method used

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  • High performance Fe/Cu wrapping structure magnesium diboride multiple core superconductive wire preparation method

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Experimental program
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Effect test

Embodiment 1

[0030] (1) To process iron pipes and copper pipes with a certain diameter, it is required that the Fe pipes can be tightly inserted into the Cu pipes. Carry out chemical polishing treatment on the inner and outer surfaces of Cu tube and Fe tube, and then clean them;

[0031] (2) Put the Fe pipe into the Cu pipe, then carry out mechanical swaging to the iron / copper pipe to obtain the iron / copper composite pipe;

[0032] (3) Prepare two types of raw material powders by mixing and ball milling process, the formulas are respectively 1) Mg powder and B powder with a molar ratio of 1:2, and 2) Mg powder, B powder and B powder with a molar ratio of 1:2:0.5 Nano NbC powder;

[0033] (4) Pack the raw material powder not containing doping material and the doping material raw material powder containing nano-NbC powder into the iron / copper composite tube respectively, compress and seal the port;

[0034](5) Under the condition of single-pass processing deformation rate of 2%, doped sing...

Embodiment 2

[0040] (1) To process iron pipes and copper pipes with a certain diameter, it is required that the Fe pipes can be tightly inserted into the Cu pipes. In order to make the iron pipes and copper pipes form close contact, the inner and outer surfaces of the Cu pipes and Fe pipes must be chemically polished. , and then cleaned;

[0041] (2) Insert the Fe tube into the Cu tube, and perform mechanical swaging to prepare the iron / copper composite tube;

[0042] (3) Prepare two types of raw material powders by mixing and ball milling process, the raw material formulations are respectively 1) Mg powder and B powder with a molar ratio of 1:2, and 2) Mg powder and B powder with a molar ratio of 1:2:0.5 and nano C powder;

[0043] (4) Pack the raw material powder not containing doping material and the doping material raw material powder containing nano-C powder into the iron / copper composite tube respectively, compress and seal the port;

[0044] (5) Under the condition of processing d...

Embodiment 3

[0050] (1) To process iron pipes and copper pipes of a certain diameter, it is required that the Fe pipe can be tightly inserted into the Cu pipe, and the inner and outer surfaces of the Cu pipe and Fe pipe are chemically polished, and then cleaned;

[0051] (2) Fe tubes are inserted into Cu tubes, and then iron / copper tubes are mechanically swaged to prepare iron / copper composite tubes;

[0052] (3) Prepare two types of raw material powders by mixing and ball milling process, the raw material formulations are respectively 1) Mg powder and B powder with a molar ratio of 1:2, and 2) Mg powder and B powder with a molar ratio of 1:2:0.5 and magnesium stearate;

[0053] (4) Pack the raw material powder not containing magnesium stearate doping material and the raw material powder containing doping material into the iron / copper composite tube respectively, compress and seal the port;

[0054] (5) Under the condition of processing deformation rate of 7% in each pass, two kinds of do...

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Abstract

This invention relates to a preparation method for MgB2 multi-core super-conductive wires with Fe / Cu jacket structure including the following steps: putting Mg and B powder in the mol ratio of 1 : 2 and Mg, B powder and doped material in the mol ratio of 1 : 2 : 0.5 into a Fe / Cu composite pipe to be pressed and sealed to get a single-core lead with Fe / Cu composite jacket after swaging, pass rolling and drawing, then a processed hardened layer of the single-core structure is eliminated and aligned to assemble the doped and non-doped single-core wires tightly in a seamless Cu pipe to be swaged and drawn to a MgB2 wire of multi-core Fe / Cu jacket structure to be processed for 0.5-5h under 650-950deg.C to become a MgB2 multi-core superconductive wire in the high performance Fe / Cu jacket.

Description

technical field [0001] The invention relates to a multi-core structure MgB 2 The invention relates to a method for preparing a superconducting wire, in particular to a method for preparing a magnesium diboride superconducting wire covered with Fe / Cu compound. Background technique [0002] Magnesium diboride (MgB) was discovered in 2001 2 ) At 39K, it has superconducting properties. It is the binary intermetallic compound superconductor with the highest critical temperature found so far. The binary compound with the highest Tc found in the past is niobium trigermanium (Nb 3 Ge), its transition temperature is only 23.2K, an increase of nearly 16K. And the magnesium diboride material is a binary compound of A15 structure, which has the characteristics of simple synthesis process, low cost, no weak connection of grain boundary and low normal resistivity. In addition, MgB 2 Magnets wound with superconducting wires can also work at a temperature of 20-30K. This temperature ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B12/00
CPCY02E40/64Y02E40/60
Inventor 禹争光马衍伟王栋樑张现平高召顺
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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