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Method for preparing MgB2 single core supper conducting wire material using continuous pipeline forming and filling technique

A technology for superconducting wires and powder core wires, which is applied in the field of continuous preparation of MgB2 superconducting wires, can solve the problems of limited industrial production, affecting the quality of finished products, and low production efficiency, and achieves favorable critical current density, improved compactness, Effects with controllable parameters

Inactive Publication Date: 2008-12-10
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the continuous large-scale production of factories, this method has the following disadvantages: 1. The powder filling method is clumsy, and the powder filling density is uneven; 2. It can only prepare wires with a limited length; 3. It cannot be produced automatically.
Not only affects the quality of the finished product, but also the production efficiency is low, which seems stretched for industrialized production

Method used

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  • Method for preparing MgB2 single core supper conducting wire material using continuous pipeline forming and filling technique
  • Method for preparing MgB2 single core supper conducting wire material using continuous pipeline forming and filling technique
  • Method for preparing MgB2 single core supper conducting wire material using continuous pipeline forming and filling technique

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The Mg, B and SiC powders were weighed according to the molar ratio of 1.1:2:0.05 and fully mixed under the Ar protection atmosphere. The mixed powder is extruded into a powder core billet with a powder extrusion molding machine, and the pressing pressure is 15 MPa. On the powder core molding equipment, introduce a 10mm wide and 0.3mm thick Nb strip, fill in the extruded powder core billet, close the joint, and reduce the diameter to Ф1.38mm one by one. Put the wire into the vacuum annealing furnace, vacuum to 10 -3 Above Pa, heat to 830°C, keep warm for 15 minutes and then cool with the furnace to get the final MgB 2 / Nb single core wire. The critical current density of the wire is calculated by the magnetic measurement method as: 6.92×10 5 A / cm 2 (0T, 4.2K), image 3 is the critical current density J of the superconducting wire under the self-field c Variation curve with temperature T.

Embodiment 2

[0027] Mg and B are weighed according to the molar ratio of 1:2 (undoped SiC) and fully mixed under the Ar protective atmosphere. Afterwards, the powder core billet is made by a powder extrusion molding machine, and the pressing pressure is 20MPa. On the powder core molding equipment, a 10mm wide and 0.4mm thick Fe belt is used as the coating material, filled with the extruded powder core billet, jointed, and reduced to Ф1..01mm step by step. Put the wire into the vacuum annealing furnace, vacuum to 10 -3 Above Pa, heat to 770°C, keep warm for 30 minutes and then cool with the furnace to get the final MgB 2 / Fe single core wire. The critical current density of the wire is calculated by the magnetic measurement method as: 5.47×10 5 A / cm 2 (0T, 4.2K), Figure 4 is the critical current density J of the superconducting wire under the self-field c Variation curve with temperature T.

Embodiment 3

[0029] The Mg, B and SiC powders were weighed according to the molar ratio of 1.1:2:0.08 and fully mixed under the Ar protection atmosphere. The mixed powder is extruded into a powder core billet with a powder extrusion molding machine, and the pressing pressure is 20 MPa. On the powder core molding equipment, introduce a 14mm wide and 0.3mm thick Fe belt, fill in the extruded powder core billet, close the joint, and reduce the diameter to Ф0.98mm step by step. Put the wire into the vacuum annealing furnace, vacuum to 10 -3 Above Pa, heat to 850°C, keep warm for 5 minutes and then cool with the furnace to get the final MgB 2 / Fe single core wire. The critical current density of the wire is calculated by the magnetic measurement method as: 6.02×10 5 A / cm 2 (0T, 4.2K), Figure 5 is the critical current density J of the superconducting wire under the self-field c Variation curve with temperature T.

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Abstract

The invention relates to the method used continual pipe line molding and filling technique to make MgB2 single core superconducting wire which belongs to MgB2 superconducting wire field. It includes the following steps: weighting Mg, B, SiC powder as given; mixing under the protection of Ar; making powder core wire; rolling the metal tape to U type groove; making powder core butt; filling the U type groove; forming delta type bonding structure; reducing its diameter; putting into sintering furnace with 10-3Pa vacuum degree, 770-850 degree centigrade for 5-30 minutes; cooling to form finished product. The invention is of great advantages to automatically consecutively make MgB2 superconducting wire rod with given length.

Description

technical field [0001] The present invention relates to a kind of MgB 2 Continuous preparation method of superconducting wire, belonging to MgB 2 The field of superconducting wire preparation. Background technique [0002] MgB 2 Superconductors have many superior characteristics, such as a critical transition temperature of 39K, no weak links, low cost of raw materials, and so on. Under the condition of 20-30K temperature and low field use, its superconducting performance has reached and surpassed that of the traditional low-temperature superconducting material Nb that has been maturely used. 3 Sn. Nb 3 The use temperature of Sn needs to be maintained by using expensive liquid helium, and the cost remains high, while MgB 2 You can use liquid nitrogen and a refrigerator to reach its superconducting temperature at low cost. Therefore, MgB 2 Superconductors are more expensive than traditional NbTi and Nb in terms of manufacturing cost and operating cost. 3 Sn supercond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B12/04H01B12/00H01B13/00
CPCY02E40/60
Inventor 索红莉蒋建敏马麟王颖马红霞李亚明张子立刘敏赵跃周美玲
Owner BEIJING UNIV OF TECH