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Method for preparing magnesium diboride superconducting wire

A technology of superconducting wire and magnesium diboride, which is applied in cable/conductor manufacturing, electrical components, circuits, etc., can solve the problems of easy oxidation of Mg powder, achieve the effect of reducing oxidation and improving superconducting characteristics

Inactive Publication Date: 2016-05-11
西安艾菲尔德复合材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of this invention is to provide a kind of preparation method of magnesium diboride superconducting wire rod, has solved existing MgB 2 The problem of easy oxidation of Mg powder in the process of superconducting wire preparation

Method used

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preparation example Construction

[0016] A preparation method of a magnesium diboride superconducting wire is implemented according to the following steps:

[0017] step 1,

[0018] Mg powder with a purity of 99.9% and B powder are thoroughly mixed at a ratio of 1:2, and then put into a Cu / Nb alloy tube, and both ends of the tube are sealed.

[0019] Step 2,

[0020] Cover the alloy tube treated in step 1 with a stainless steel tube, and sinter in an Ar gas protective atmosphere at a sintering temperature of 850°C to 870°C and a sintering time of 40 to 50 minutes; at the same time, a section of magnesium strip is placed in the sintering furnace.

[0021] Step 3,

[0022] Take out the Cu / Nb alloy tube treated in step 2, and mechanically peel off the stainless steel tube when the tube temperature drops to 180°C to 200°C to obtain MgB 2 Primary body of superconducting wire.

[0023] Step 4, the MgB processed through step 3 2 The primary body of the superconducting wire is straightened and leveled to obtain M...

Embodiment 1

[0025] Mg powder with a purity of 99.9% and B powder are fully mixed according to the ratio of the amount of substances of 1:2, and then put into a Cu / Nb alloy tube, the two ends of the tube mouth are sealed, and the alloy tube is covered with a stainless steel tube. Sintering under air protection atmosphere, the sintering temperature is 850°C, and the sintering time is 50min; at the same time, a section of magnesium strip is placed in the sintering furnace. Then, the Cu / Nb alloy tube was taken out, and the stainless steel tube was mechanically peeled off when the tube temperature dropped to 180°C to obtain MgB 2 Primary body of superconducting wire. Then to MgB 2 The primary body of the superconducting wire is straightened and leveled to obtain MgB 2 superconducting wire.

Embodiment 2

[0027] Mg powder with a purity of 99.9% and B powder are fully mixed according to the ratio of the amount of substances of 1:2, and then put into a Cu / Nb alloy tube, the two ends of the tube mouth are sealed, and the alloy tube is covered with a stainless steel tube. Sintering under air protection atmosphere, the sintering temperature is 860°C, and the sintering time is 45min; at the same time, a section of magnesium strip is placed in the sintering furnace. Then, the Cu / Nb alloy tube was taken out, and the stainless steel tube was mechanically peeled off when the tube temperature dropped to 190°C to obtain MgB 2 Primary body of superconducting wire. Then to MgB 2 The primary body of the superconducting wire is straightened and leveled to obtain MgB 2 superconducting wire.

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Abstract

The invention discloses a method for preparing a magnesium diboride superconducting wire. The method is applied according to the following steps of mixing Mg powder with purity of 99.9% and B powder according to a mass ratio of 1:2 to uniform, and then filling the mixture into a Cu / Nb alloy pipe; then sleeving a stainless steel pipe and sintering in an Ar gas protecting atmosphere; mechanically peeling the stainless steel pipe; and performing straightening and leveling on a magnesium diboride superconducting wire initial body for obtaining the magnesium diboride superconducting wire. According to the method of the invention, through filling the Mg powder and the B powder into the alloy pipe and performing high-temperature sintering under the protection of the Ar gas and a magnesium ribbon, oxidation of the magnesium in the alloy pipe is reduced and superconducting characteristic of the superconducting wire is improved.

Description

technical field [0001] The invention belongs to the technical field of superconducting material preparation, and relates to a preparation method of a magnesium diboride superconducting wire. Background technique [0002] Superconducting wire is an important application field of superconducting materials. At present, MgB 2 There are three main methods of wire preparation, which are diffusion method, powder casing method and continuous pipeline forming method. The length of the superconducting wire prepared by the diffusion method is limited, and it is brittle, so it cannot be bent to a too small radius, and a long wire strip cannot be prepared; the powder casing method can be produced by using conventional swaging, stretching, and rolling equipment. MgB 2 Superconducting wire tape, but its biggest shortcoming is that it can only prepare a limited length of wire tape. The continuous pipeline forming method enables the preparation of continuous MgB 2 Superconducting wire st...

Claims

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Application Information

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IPC IPC(8): H01B13/00
Inventor 齐海港
Owner 西安艾菲尔德复合材料科技有限公司