Check patentability & draft patents in minutes with Patsnap Eureka AI!

Method for preparing C-doped MgB2 superconducting material with low oxygen content

A low-oxygen content, superconducting material technology, applied in the field of MgB2 superconducting material preparation, can solve the problems of reducing the critical current density of materials, reducing critical current density, hindering current transmission, etc., and achieve high critical current density and high Good density and grain connectivity

Inactive Publication Date: 2009-11-18
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] MgB discovered in 2001 2 Superconductors have attracted great attention from all over the world due to their advantages such as high superconducting transition temperature and upper critical field, large coherence length, no weak connection at grain boundaries, simple structure and low cost. However, MgB 2 The critical current density of a superconductor decreases sharply with the increase of the magnetic field, showing a lower irreversible field. These problems seriously affect its application in engineering
A large number of oxides are easy to accumulate at the grain boundary, which hinders the transmission of current and greatly reduces the critical current density of the material

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] First, high-purity crystalline boron powder (purity is 99.999%), analytical pure magnesium powder (purity is 99.8%) and analytical pure amorphous or nano carbon powder (purity is 99.9%) according to Mg:B:C=1:1.95:0.05 After fully mixing and grinding for 2 hours, the powder is pressed into a Φ30mm block; then the pressed block is placed in a vacuum annealing furnace, and the vacuum annealing furnace is evacuated until the vacuum degree of the vacuum annealing furnace reaches 10 -3 After Pa, fill it with argon, then raise the temperature to 700°C at a constant temperature of 2 hours at a heating rate of 35°C / min, and finally cool it to room temperature at a cooling rate of 25°C / min. and C-doped MgB with high critical current density 2 The superconductor has an oxide mass content of less than 3%, and a superconducting transition temperature Tc of 38K.

Embodiment 2

[0018] First, high-purity crystalline boron powder (purity is 99.999%), analytical pure magnesium powder (purity is 99.8%) and analytical pure amorphous or nano carbon powder (purity is 99.9%) according to Mg:B:C=1:1.92:0.08 After fully mixing and grinding for 1.5 hours, the powder is pressed into a Φ30mm block; then the pressed block is placed in a vacuum annealing furnace, and the vacuum annealing furnace is evacuated until the vacuum degree reaches 10 -3 After Pa, fill in the mixed gas of argon and hydrogen, wherein the volume percentage of argon and hydrogen in the mixed gas is 18:1, then raise the temperature to 800°C at a constant temperature of 1.5 hours at a rate of 40°C / min, and finally Cool it to room temperature at a cooling rate of 30°C / min to prepare C-doped MgB with high purity, high density and high critical current density 2 The superconductor has an oxide mass content of less than 3%, and a superconducting transition temperature Tc of 38.5K.

Embodiment 3

[0020] First, high-purity crystalline boron powder (purity is 99.999%), analytical pure magnesium powder (purity is 99.8%) and analytical pure amorphous or nano carbon powder (purity is 99.9%) according to Mg: B: C=1: 1.90: 0.10 After fully mixing and grinding for 2 hours, the powder is pressed into a Φ30mm block; then the pressed block is placed in a vacuum annealing furnace, and the vacuum annealing furnace is evacuated until the vacuum degree reaches 10 -3 After Pa, fill in the mixed gas of argon and hydrogen, wherein the volume percentage of argon and hydrogen in the mixed gas is 19:1, then raise the temperature to 750°C for 3 hours at a heating rate of 40°C / min, and finally Cool it to room temperature at a cooling rate of 35°C / min to prepare C-doped MgB with high purity, high density and high critical current density 2 The superconductor has an oxide mass content of less than 2.5%, and a superconducting transition temperature Tc of 38.5K.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for preparing a C-doped MgB2 superconducting material with low oxygen content. The method comprises the following steps: selecting high-purity crystalline boron, common magnesium powder and amorphous carbon powder or nano carbon powder as raw materials; mixing the three kinds of powder according to a Mg to B to C ratio of 1: 2-x: x (wherein x is more than or equal to 0.05 and less than or equal to 0.20); fully mixing the raw materials; pressing the raw materials into blocks; and thermally treating the raw materials to obtain the C-doped MgB2 superconducting material with low oxygen content finally. The C-doped MgB2 superconducting material prepared by the preparation method has high compactness and low oxide content and other impurity phase content, and the superconducting material with high performance can be prepared at low temperature because the high-purity crystalline boron has small granularity and high activity.

Description

technical field [0001] The present invention relates to a kind of MgB 2 The preparation method of superconducting material, especially relates to a kind of low oxygen content C-doped MgB 2 Methods for the preparation of superconducting materials. Background technique [0002] MgB discovered in 2001 2 Superconductors have attracted great attention from all over the world due to their advantages such as high superconducting transition temperature and upper critical field, large coherence length, no weak connection at grain boundaries, simple structure and low cost. However, MgB 2 The critical current density of a superconductor decreases sharply with the increase of the magnetic field, showing a lower irreversible field. These problems seriously affect its application in engineering. The research results show that an appropriate amount of C doping can not only increase the upper critical field of the material, but also increase the critical current density of the material. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/58
Inventor 刘国庆闫果王庆阳熊晓梅焦高峰李成山冯勇
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com