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MgB2 superconducting material and its preparation method

A superconducting material and preparation technology, applied in the usage of superconducting elements, the manufacture/processing of superconducting devices, superconducting devices, etc., can solve the problems of high cost, poor critical current density, poor inter-grain connection performance, etc. To achieve the effect of strengthening the grain boundary pinning, the preparation method is practical and simple, and the effect of improving the critical current density

Inactive Publication Date: 2002-01-02
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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Problems solved by technology

However, compared with low-temperature superconductors and A15 superconductors at present, MgB 2 The critical current density is still very low
MgB is usually prepared 2 The method is to solid-state sinter a mixture of B and Mg under an argon atmosphere, and form MgB through a diffusion reaction. 2 , the MgB prepared by this method 2 The bulk and wire materials are usually loose, resulting in poor connection performance between grains, resulting in poor critical current density
Preparation of MgB by solid-state sintering 2 During the process, the MgB can be increased by applying pressure 2 Density, however, this method is costly and reduces the MgB 2 transition temperature, it is difficult to prepare practical wires and strips, which greatly affects the MgB 2 The practical process of materials

Method used

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preparation example Construction

[0010] A kind of MgB of the present invention 2 The preparation method of the superconducting material is characterized in that Mg powder, Me powder and B powder are prepared according to the molar ratio (0.8-0.9): (0.1-0.2): 2 and mixed evenly, (whether compacted, how about the pressure?) , sintering in an argon atmosphere at normal pressure, heat preservation at 600°C-650°C for 1-2 hours, heat preservation at 750°C-800°C for 1-2 hours, heat preservation at 850°C-950°C for 2-4 hours, and prepare the MgB of the present invention 2 superconducting material.

[0011] Using the method of the present invention, Mg powder, Me powder and B powder can be prepared and mixed evenly, and then directly obtained after sintering MgB powder with high critical current density 2 Superconducting block material; in addition, the mixed material is put into a copper tube with Ta as a barrier layer, processed into a 0.3mm×4.0mm strip, and then sintered in an argon atmosphere at normal pressure to...

example 1

[0014] Preparation of MgB Doped with Metal Element Ti 2 blocks. Mg powder, Ti powder and B powder were prepared according to the molar ratio: 0.9:0.1:2 and mixed evenly, and sintered and heat-treated in an atmosphere of atmospheric pressure argon, at 650°C for 1 hour, at 750°C for 1.5 hours, and at 850°C for 2 hours. hours, the preparation of MgB containing doped metal element Ti boride 2 blocks. This MgB 2 The bulk material is at 5K, and its critical current density can reach 2×10 6 A / cm 2 , at 2T, the critical current density can reach 3×10 5 A / cm 2 ; At 20K, its critical current density can reach 1.3×10 6 A / cm 2 , at 2T, the critical current density can reach 9.4X10 4 A / cm 2 .

example 2

[0016] Preparation of MgB Doped with Metal Element Ti 2 Strip. Prepare Mg powder, Ti powder and B powder according to the molar ratio: 0.85:0.15:2 and mix them uniformly, put them into a copper tube with Ta as the barrier layer, process it into a strip of 0.3mm×4.0mm, and place it under normal pressure argon Carry out sintering heat treatment in air atmosphere, keep at 600°C for 1 hour, at 800°C for 1 hour, at 900°C for 2 hours, and prepare MgB containing doped metal element Ti boride 2 Strip. This MgB 2 At 10K, the critical current density of the strip can reach 1.58×10 6 A / cm 2 , at 2T, the critical current density can reach 1.6×10 5 A / cm 2 ; At 20K, its critical current density can reach 9.3×10 5 A / cm 2 , at 2T, the critical current density can reach 4.27×10 4 A / cm 2 .

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Abstract

The present invention relates to a novel MgB2 superconductivity material with high critical current density and its preparation method. It is characterized by that in the MgB2 superconductivity material, one method element Me selected from Ti, Zr, Mo, Nb, W or Hf is doped, and the mole ratio of its composition is Mg:Me:B=(0.8-0.9):(0.1-0.2):2. Its preparation method includes the steps of proportioning Mg powder, Me powder and B material component, mixing them uniformly and sintering at normal pressure in argon atmosphere. This invented MgB2 superconductivity material possesses high critical curcent density at above 10K temp., and its performance also is excellent under the magnetic field.

Description

technical field [0001] a MgB 2 Superconducting material and preparation method thereof, involving a novel MgB with high critical current density 2 Superconducting materials and methods for their preparation. Background technique [0002] MgB 2 It is a newly discovered new type of superconducting material. It is an intermetallic compound superconductor with a transition temperature of 39K. It is very promising to be widely used in the temperature range of 20K-30K. Due to MgB 2 With simple chemical composition and crystal structure, in MgB 2 There is no weak link between the grains, compared with high temperature oxide superconductors, MgB 2 It will have incomparable advantages in preparation and material production. At the same time, compared with low-temperature superconductors and A15 superconductors, MgB 2 The superconducting transition temperature is as high as 39K, and the application between 20K-30K just fills the gap between low-temperature superconductors and A...

Claims

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Application Information

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IPC IPC(8): C04B35/00H01B12/00H01L39/12H01L39/24
CPCY02E40/64Y02E40/60
Inventor 冯勇付宝全赵勇刘奉生刘向宏纪平张平祥周廉刘春芳杜社军阎果吴晓祖
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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