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Method for pre-sintering copper-containing active magnesium diboride superconducting block

A technology of magnesium diboride and superconducting block, which is applied in the field of superconducting, and achieves the effects of strong controllability, stable structure and simple preparation method

Inactive Publication Date: 2017-10-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it still needs to be improved to meet the actual production application.

Method used

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  • Method for pre-sintering copper-containing active magnesium diboride superconducting block
  • Method for pre-sintering copper-containing active magnesium diboride superconducting block
  • Method for pre-sintering copper-containing active magnesium diboride superconducting block

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Adding mass fraction of 3wt.% copper and MgB 2 The powder is fully mixed in an agate mortar, and then it is pressed into small pieces under a pressure of 5MPa, and the pressed sample is put into a thermogravimetric differential thermal analyzer (Mettler Toledo TGA / DSC1 / ), and passed into Argon gas is used for low-temperature sintering, and the setting program is as follows: after heating up to 900°C at a heating rate of 20°C / min, heat preservation and sintering at this temperature for 10 minutes, and then cool down to 650°C at a cooling rate of 40°C / min, and heat preservation for one Hours, and finally down to room temperature at a cooling rate of 40°C / min.

Embodiment 2

[0022] Adding copper and MgB with a mass fraction of 1wt.% 2 The powder is fully mixed in an agate mortar, and then pressed into small pieces under a pressure of 2MPa, and the pressed sample is put into a thermogravimetric differential thermal analyzer (Mettler Toledo TGA / DSC1 / ), and passed into Argon gas is used for low-temperature sintering, and the setting program is: after heating up to 1000°C at a heating rate of 10°C / min, heat preservation and sintering at this temperature for 0 minutes, and then cool down to 600°C at a cooling rate of 50°C / min, and heat preservation for 0 Hours, and finally cooled down to room temperature at a cooling rate of 50°C / min.

Embodiment 3

[0024] Adding mass fraction of 5wt.% copper and MgB 2 The powders were fully mixed in an agate mortar, and then pressed into small pieces under a pressure of 8 MPa, and the pressed samples were put into a thermogravimetric differential thermal analyzer (Mettler Toledo TGA / DSC1 / ), and passed into Argon gas is used for low-temperature sintering, and the setting program is as follows: after heating up to 800°C at a heating rate of 10°C / min, heat preservation and sintering at this temperature for 20 minutes, and then cool down to 700°C at a cooling rate of 10°C / min, and then hold heat for 3 hours, and finally cooled down to room temperature at a cooling rate of 10°C / min.

[0025] The first sintering method is selected to obtain more superconducting phases. By adding copper, not only can the oxidation rate be effectively reduced, but also a certain effective pinning center can be introduced on this basis to obtain a better superconducting phase. .

[0026] From figure 2 It can be...

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Abstract

The invention belongs to a method for pre-sintering a copper-containing active magnesium diboride superconducting block. The method comprises the following steps: adding 1-5 wt% of copper powder to a precursor powder MgB2 powder, fully mixing the copper powder and the precursor powder in an agate mortar, and processing the obtained mixture under a pressure of 2-8 MPa to prepare a small cylindrical sheet; placing the small cylindrical sheet in a thermogravimetric-differential thermal analyzer, heating the small cylindrical sheet in a flowing highly-pure argon atmosphere to 800-1000 DEG C, keeping the temperature for 0-20 min, and sintering the small cylindrical sheet; and cooling the sintered small cylindrical sheet to 600-700 DEG C, keeping the temperature for 0-3 h, and cooling the cooled small cylindrical sheet to room temperature according to a speed of 10-40 DEG C / min. The above prepared MgB2 superconducting material with a high current carrier is obtained through introducing a copper adding technology to a pre-sintering technology, has a stable structure and a high critical conversion temperature, and is better than all MgB2 superconducting blocks prepared through the pre-sintering technology in the current carrying ability; and the preparation method ahs the advantages of simplicity, high controllability, no pollution, wide sources of raw materials, low preparation cost, and wide engineering application and promotion prospect.

Description

technical field [0001] The invention belongs to the field of superconducting technology, and particularly proposes to activate MgB through copper doping 2 Superconducting bulk in-situ sintering preparation technology. Background technique [0002] Research on new high-temperature superconducting materials, superconducting physics and applications has been a hot research field in recent years. In early 2001, Nagamatsu et al. found that the superconducting critical transition temperature (T c )39K of MgB 2 The new superconductor has aroused widespread concern in the scientific community. MgB 2 It has excellent characteristics such as simple structure, long coherence length, high critical current density and stable chemical properties. It is well known that before the discovery of high-temperature superconductors, the T of conventional metal or alloy superconductors c not improved for a long time. The previous champion of metal superconductors was Nb 3 Ge, its T c =23K....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/64
CPCC04B35/58057C04B35/64C04B2235/407C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/658C04B2235/80C04B2235/96
Inventor 马宗青程芳刘永长余黎明李冲刘晨曦
Owner TIANJIN UNIV
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