Corbon-containing superconductive MgB2 material and its preparing process

A technology of superconducting materials and molar ratios, applied in superconducting devices, chemical instruments and methods, boron/boride, etc., can solve the problems of low performance of wire and strip materials, achieve low cost, performance improvement, and optimization The effect of the preparation process

Inactive Publication Date: 2007-06-27
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

But regarding carbon doping to improve MgB 2 There are few reports on the properties of wire and strip

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0012] Preparation (MgB 2 ) 0.95 C 0.05 superconducting tape. Mg powder, B powder, and nano C powder are accurately weighed and mixed uniformly according to the molar ratio of 0.95:1.9:0.05, put into an iron pipe with a diameter of 8 mm and seal, then carry out swaging and drawing in sequence with a deformation rate of 10%. Drawing, rolling, obtain the strip of width 3.7 millimeters, thickness 0.5 millimeters. The strip was kept at 750 °C for 1 hour in an argon vacuum furnace with a flowing atmosphere, and then cooled to room temperature in the vacuum furnace to obtain C-containing MgB 2 superconducting tape. Measured by the standard four-lead method, the critical current density of the prepared strip reaches 1.85×10 at 4.2K and 10T. 4 A / cm 2 , reaching 2.8×10 at 4.2K, 14T 3 A / cm 2 .

example 2

[0014] Preparation (MgB 2 ) 0.975 C 0.025 superconducting tape. Mg powder, B powder, and nano C powder are accurately weighed and mixed uniformly according to the molar ratio of 0.975:1.95:0.025, put into an iron pipe with a diameter of 8 mm and seal, then carry out swaging and drawing in sequence with a deformation rate of 10%. Drawing, rolling, obtain the strip of width 3.1 millimeters, thickness 0.5 millimeters. The strip was kept at 650 °C for 1 hour in an argon vacuum furnace with flowing atmosphere, and then cooled to room temperature in the vacuum furnace to obtain MgB containing C 2 superconducting tape. Measured by the standard four-lead method, the critical current density of the prepared strip reaches 1.5×10 at 4.2K and 10T. 4 A / cm 2 , reaching 1.6×10 at 4.2K, 14T 3 A / cm 2 .

example 3

[0016] Preparation (MgB 2 ) 0.8 C 0.2 superconducting wire. Mg powder, B powder, nano C powder are accurately weighed and mixed uniformly according to the molar ratio of 0.8:1.6:0.2, put into an iron pipe with a diameter of 8 mm and seal it, then carry out swaging and drawing in sequence with a deformation rate of 5%. Pull out to obtain a wire rod with a diameter of 0.8 mm. The wire was kept at 900°C for 0.5 hours in an argon vacuum furnace with flowing atmosphere, and then cooled to room temperature in the vacuum furnace to obtain MgB containing C 2 superconducting wire.

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Abstract

The present invention is carbon-containing superconductive MgB2 material and its preparation process, and features that the carbon-containing superconductive MgB2 material is prepared with Mg powder, B powder and nanometer C powder in the molar ratio of (0.8-0.975) to (1.8-1.95) to (0.025-0.2), and through mixing, sealing into metal pipe, swage forging and drawing or rolling successively in certain deformation rate to obtain carbon-containing superconductive MgB2 wire or belt; or tabletting the mixture to obtain carbon-containing superconductive MgB2 block; setting the obtained wire, belt or block into vacuum furnace, vacuumizing, filling argon, and maintaining at 600-1000 deg.c for 0.5-2 hr to obtain carbon-containing superconductive MgB2 material ultimately. Thus prepared superconductive MgB2 material has excellent performance in magnetic field and good repeatability.

Description

technical field [0001] The present invention relates to a carbon-containing MgB 2 Superconducting materials and methods for their preparation. Background technique [0002] MgB 2 It is a new type of superconducting material discovered in 2001. It has the characteristics of high transition temperature, large coherence length, high upper critical field, no weak connection at grain boundary, simple structure, and low cost. These application advantages make MgB 2 Become the most powerful competitor for materials used in the 20K-30K temperature range. However, currently prepared MgB 2 The critical current density of the material is still relatively low compared with low-temperature superconductors and A15 superconductors. The critical current density is a key characteristic that determines whether a superconducting material can be applied on a large scale, thin film or bulk MgB 2 Superconductors have a high critical current density at zero field (at 4.2K, J C >10 6 A / c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/00C01B31/00C01B35/00C01B35/04
CPCH01L39/141H10N60/855H10N60/202
Inventor 张现平马衍伟
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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