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A method for preparing iron-based superconducting materials based on directional solidification technology

A technology of directional solidification and superconducting materials, which is applied in the direction of cable/conductor manufacturing, electrical components, circuits, etc., can solve the problems of insufficient powder density, poor grain connectivity, and current consumption, so as to improve density and performance , Reduce the effect of oxidation and volatilization

Active Publication Date: 2021-03-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many holes in the wire and strip prepared by the powder tube method, resulting in low density. The first reason for these holes is that the powder density itself is not high enough during the powder tube rolling process.
The second is that during the powder sintering process, due to the presence of residual air in the sample or the volatilization of volatile elements in the sample during high-temperature sintering, it causes
Experimental studies have proved that the current consumption is very obvious in the crack and impurity phase area, because the existence of many cracks and FeAs amorphous impurity phase leads to extremely poor connectivity of grains, which is also an important factor for the sharp drop in critical current density

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1): Ingredients. Mix 7.8g of iron powder with a purity higher than 99.99%, 11.25g of arsenic powder, 0.62g of cobalt powder and 10.3g of barium flakes in a glove box under inert gas protection conditions to obtain mixed raw materials.

[0025] (2): Ball milling. Put the mixed raw materials into a ball mill tank, seal it and put it into a ball mill for ball milling for 8 hours at a ball milling speed of 350 rpm, and mix the various raw materials evenly.

[0026] (3): Sintering. Put the ball-milled powder into a niobium tube and seal it, then put the sealed niobium tube into a quartz glass tube for vacuum sealing, and then put it into a heating furnace to sinter the clinker. The sintering mechanism is as follows: heating from 20°C to 500°C for 3 hours, holding at 500°C for 10 hours, heating from 500°C to 880°C for 2 hours, then holding at 880°C for 35 hours, and finally closing the furnace for sampling.

[0027] (4): Secondary ball milling. The sintered cooked powder...

Embodiment 2

[0033] (1): Ingredients. Mix 7.8g of iron powder with a purity higher than 99.99%, 11.25g of arsenic powder, 0.62g of cobalt powder and 10.3g of barium flakes in a glove box under inert gas protection conditions to obtain mixed raw materials.

[0034] (2): Ball milling. Put the mixed raw materials into a ball mill tank, seal it and put it into a ball mill for ball milling for 8 hours at a ball milling speed of 350 rpm, and mix the various raw materials evenly.

[0035] (3): Sintering. Put the ball-milled powder into a niobium tube and seal it, then put the sealed niobium tube into a quartz glass tube for vacuum sealing, and then put it into a heating furnace to sinter the clinker. The sintering mechanism is as follows: heating from 20°C to 500°C for 3 hours, holding at 500°C for 10 hours, heating from 500°C to 880°C for 2 hours, then holding at 880°C for 35 hours, and finally closing the furnace for sampling.

[0036] (4): Secondary ball milling. The sintered cooked powder...

Embodiment 3

[0042] (1): Ingredients. Mix 7.8g of iron powder with a purity higher than 99.99%, 11.25g of arsenic powder, 0.62g of cobalt powder and 10.3g of barium flakes in a glove box under inert gas protection conditions to obtain mixed raw materials.

[0043] (2): Ball milling. Put the mixed raw materials into a ball mill tank, seal it and put it into a ball mill for ball milling for 8 hours at a ball milling speed of 350 rpm, and mix the various raw materials evenly.

[0044] (3): Sintering. Put the ball-milled powder into a niobium tube and seal it, then put the sealed niobium tube into a quartz glass tube for vacuum sealing, and then put it into a heating furnace to sinter the clinker. The sintering mechanism is as follows: heating from 20°C to 500°C for 3 hours, holding at 500°C for 10 hours, heating from 500°C to 880°C for 2 hours, then holding at 880°C for 35 hours, and finally closing the furnace for sampling.

[0045] (4): Secondary ball milling. The sintered cooked powder...

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Abstract

The invention provides a preparation method of an iron-based superconducting material based on directional solidification technology, and belongs to the field of material preparation. The preparationmethod comprises the following steps of 1, mixing; 2, ball milling; 3, sintering; 4, secondary ball milling; 5, pressing; and 6, directional solidification. In the step 1, raw materials are mixed in proportion; in the step 2, the mixed raw materials are milled into powder which is uniformly mixed. In the step 3, the powder is sintered; 4, the sintered materials are milled into powder with uniformparticles in a ball milling mode; in the step 5, the powder after secondary ball milling is pressed into a formed blank with high compactness through a die; and in the step 6, directional solidification is carried out on the blank subjected to compression forming, and the high-performance iron-based superconducting bar is finally obtained (the above step is completed in a vacuum or protective atmosphere). The preparation method of the iron-based superconducting material is simple in process and high in controllability, and can prepare large-size, high-density and high-orientation iron-based superconducting materials. The prepared iron-based superconducting material has the characteristics of being excellent in performance, and particularly high in critical current density.

Description

technical field [0001] The invention provides a method for preparing an iron-based superconducting material based on directional solidification technology, belonging to the field of material preparation. Background technique [0002] As an important class of functional materials, superconducting materials are widely used in many fields such as electric power, computer, transportation, nuclear energy utilization and daily life. Since their discovery, superconducting materials have been a research hotspot in the scientific community. Among the many known superconducting material systems, iron-based superconducting materials, as an emerging high-temperature superconducting material, have attracted widespread attention from scientists and engineers due to their high superconducting critical transition temperature and high critical current density. [0003] At present, the preparation methods of iron-based superconducting materials mainly include powder tube method to prepare iro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00B22D27/04H01B13/00
CPCB22D27/045C22C30/00H01B13/00
Inventor 黄海友杨玉通李铖谢建新
Owner UNIV OF SCI & TECH BEIJING