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Heat treatment method for iron base MgB2 superconductor wire and belt

A technology of iron-based magnesium diboride and heat treatment method, applied in the usage of superconductor elements, heat treatment furnace, heat treatment equipment, etc., can solve the problems of low defect density, reduction of superconducting critical current density value, increase of material defect density, etc.

Inactive Publication Date: 2006-11-22
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the resistance furnace equipment structure, the temperature rise and fall speed generally does not exceed 90°C / min, which is not conducive to increasing the defect density of the sintered magnesium diboride material
However, if the defect density is low, the effective pinning center density will inevitably decrease, and the superconducting critical current density will decrease accordingly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Mix the magnesium powder with a purity of 99.5% and a particle size of 100 mesh with the boron powder with a purity of 92% and a particle size of 100 mesh according to a molar ratio of 1:2, and after ball milling, fill it into an iron pipe with an outer diameter of 14 mm and an inner diameter of 10 mm, compact and fill Finally, seal both ends of the iron pipe. Then the iron pipe undergoes 40 passes of rotary forging and drawing series of cold processing, and the deformation of each pass is controlled within the range of 1% to 5%, so as to obtain an iron-based Φ1.75mm thin wire filled with magnesium powder and boron powder in the center. Connect the lead wires at both ends and place them in the quartz tube, cover the two ends with a quartz cap, pump the quartz tube with a vacuum pump to a vacuum degree < 1Pa, then pass in Ar gas, adjust the output current of the power supply to 70A, and control the current value flowing through the sample. After heating the sample at a r...

Embodiment 2

[0017] Mix the magnesium powder with a purity of 99.5% and a particle size of 200 meshes and boron powder with a purity of 99.99% and a particle size of 100 meshes in a molar ratio of 1:2, and after ball milling, fill them into an iron pipe with an outer diameter of 14 mm and an inner diameter of 10 mm, compact and fill Finally, the two ends of the iron pipe are sealed, and then the iron pipe is swaged and drawn for 36 passes, and the deformation of each pass is controlled within the range of 3% to 16%, so as to obtain thin lines, and then rolled to obtain the center Iron base 4×0.5mm filled with magnesium powder and boron powder 2 Thin belt. Connect the lead wires at both ends and place them in the quartz tube, cover the two ends with a quartz cap, pump the quartz tube with a vacuum pump to a vacuum degree < 1Pa, then pass in Ar gas, adjust the output current of the power supply to 100A, and control the current value flowing through the sample. After heating the sample at a ...

Embodiment 3

[0019] Mix the magnesium powder with a purity of 99.5% and a particle size of 150 mesh and boron powder with a purity of 96% and a particle size of 100 mesh according to a molar ratio of 1:2, and after ball milling, fill it into an iron pipe with an outer diameter of 14 mm and an inner diameter of 10 mm, compact and fill it Finally, the two ends of the iron pipe are sealed, and the iron pipe is subjected to 20 passes of swaging and drawing to control the deformation of each pass within the range of 2% to 30% to obtain a thin line, which is then rolled to obtain a center filler. Iron base 4×0.5mm with magnesium powder and boron powder 2 Thin tape, both ends are connected with lead wires and placed in the quartz tube, the two ends are covered with quartz caps, the quartz tube is pumped with a vacuum pump to a vacuum degree < 1Pa, then Ar gas is introduced, the output current of the power supply is adjusted to 30-50A, and the flow through the sample is controlled. The size of the...

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PUM

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Abstract

The invention discloses a heat disposal method of iron-base magnesium diboride superconductive wire, which is characterized by the following: disposing the core superconductive material through joule heat of current flow; blending magnesite powder and boron powder evenly according to chemical gauge rate; filling the mixture in the iron pipe after grinding; producing iron-base leptctene and fasciola material with magnesite powder and boron powder in the middle through rotating, drawing and rolling; connecting two ends of leptctene or fasciola with blaster fuse in the Ar quartz tube; controlling the heating speed at 45-900 deg.c per min and heat disposal temperature at 600-900 deg.c; keeping temperature for 10-60 min; cooling at 30-300 deg.c per min to approach indoor temperature. The invention can improve the heating and cooling speed in the heat disposal course, which increases the marginal current density value of magnesium diboride superconductive wire.

Description

technical field [0001] The invention belongs to a method for preparing a superconducting material, in particular to a heat treatment method for a magnesium diboride superconducting wire strip. Background technique [0002] On January 10, 2001, Professor J. Akimitsu of Aoyama College in Japan announced the discovery of magnesium diboride (MgB 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 work well at temperatures as low as 20K, and can be cool...

Claims

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Application Information

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IPC IPC(8): C21D9/52C21D1/40C21D11/00H01B12/00
CPCY02E40/60
Inventor 禹争光马衍伟张现平高召顺
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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