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Method for manufacturing iron-based superconductor by using SPS (Spark Plasma Sintering) technology

An iron-based superconductor and technology, applied in the field of high-temperature superconducting material preparation, can solve the problems of affecting performance, poor transport performance, long heat treatment time, etc., and achieve the effects of increasing density, improving performance, and reducing element loss

Inactive Publication Date: 2012-08-01
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the commonly used preparation method of iron-based superconductors is the traditional solid-state reaction. This method requires a long heat treatment time when preparing iron-based superconductors. The long-time heat treatment leads to a large loss of some elements (such as: As and F), which reduces the quality of the prepared material, thereby affecting its performance; in addition, the iron-based superconductor prepared by the traditional heat treatment method is not dense and contains more holes, resulting in poor transport performance

Method used

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  • Method for manufacturing iron-based superconductor by using SPS (Spark Plasma Sintering) technology
  • Method for manufacturing iron-based superconductor by using SPS (Spark Plasma Sintering) technology
  • Method for manufacturing iron-based superconductor by using SPS (Spark Plasma Sintering) technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: SmO 0.8 f 0.2 Preparation of FeAs Superconductor

[0018] Step 1: Preparation of initial powder

[0019] Sm powder and As powder were weighed according to the molar ratio of 1:1.03 and mixed under Ar protection atmosphere. The mixed Sm powder and As powder were packaged in a quartz tube for sintering, and the vacuum degree was 10 -6 Pa, the heat treatment process is as follows: from room temperature to 400°C, the heating rate is 5°C / min; from 400°C to 600°C, the heating rate is 1°C / min; at 600°C for 5 hours; from 600°C to 900°C, the heating rate is 1°C / min; heat preservation at 900°C for 10 hours; finally cool the furnace to room temperature.

[0020] Step 2: SmO 0.8 f 0.2 Preparation of FeAs Superconductor

[0021] In a high-purity argon-protected glove box, the initial powder SmAs powder, Fe powder, and Fe powder prepared in the first step were 2 o 3 Powder, FeF 3 The powder is mixed according to the ratio of 30:12:8:2; then ball milling is carri...

Embodiment 2

[0023] Example 2: CeO 0.8 f 0.2 Preparation of FeAs Superconductor

[0024] Step 1: Preparation of initial powder

[0025] Ce powder and As powder were weighed according to the molar ratio of 1:1 and mixed under Ar protection atmosphere. The mixed Ce powder and As powder are packaged in a high-vacuum quartz tube for sintering, and the vacuum degree of the quartz tube is 10 -4 Pa, the heat treatment process is as follows: from room temperature to 400°C, the heating rate is 5°C / min; from 400°C to 600°C, the heating rate is 3°C / min; at 600°C for 10 hours; from 600°C to 900°C, the heating rate is 3°C / min; heat preservation at 900°C for 20 hours; finally cool the furnace to room temperature.

[0026] Step 2: CeO 0.8 f 0.2 Preparation of FeAs Superconductor

[0027] In a high-purity argon-protected glove box, the initial powder CeAs powder, Fe powder, Fe powder prepared in the first step were 2 o 3 Powder, FeF 3 The powder is mixed according to the ratio of 30:12:8:2; the...

Embodiment 3

[0028] Example 3: NdO 0.8 f 0.2 Preparation of FeAs Superconductor

[0029] Step 1: Preparation of initial powder

[0030] Weigh the Nd powder and As powder according to the molar ratio of 1:1.1 and mix them under Ar protective atmosphere; package the mixed Nd powder and As powder in a high-vacuum quartz tube for heat treatment, and the vacuum degree of the quartz tube is 10 -5Pa. The heat treatment process is as follows: from room temperature to 400°C, the heating rate is 5°C / min; from 400°C to 600°C, the heating rate is 3°C / min; at 600°C for 5 hours; from 600°C to 900°C, the heating rate is 3°C / min ; 900 ° C for 20 hours; Finally, the furnace was cooled to room temperature.

[0031] Step 2: NdO 0.8 f 0.2 Preparation of FeAs Superconductor

[0032] In a high-purity argon-protected glove box, the initial powder NdAs powder, Fe powder, Fe powder prepared in the first step were 2 o 3 Powder, FeF 3 The powder is mixed according to the ratio of 30:12:8:2; then ball milli...

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Abstract

The invention discloses a method for manufacturing an iron-based superconductor by using an SPS (Spark Plasma Sintering) technology and belongs to the technical field of high-temperature superconductive materials. The method comprises the following steps of: carrying out thermal treatment on rare earth powder Ln and As powder according to the ratio being 1:(1-1.1) in a high vacuum quartz tube to prepare initial powder LnAs; carrying out ball milling on LnAs and Fe powder, Fe2O3 powder and FeF3 powder according to mol ratio being 3:(1+x):(1-x):x; placing a die filled with powder into sintering equipment; manufacturing the iron-based superconductor by adopting a spark plasma sintering technology; and pressurizing and sintering at a sintering pressure of 30-50Mpa and the sintering temperature of 900-1100DEG C for 5-60 minutes under vacuum conditions. According to the method disclosed by the invention, the sintering time is short, so that the loss of component elements is reduced and the compactness of the material is reduced, thus the high-performance iron-based superconductor is obtained.

Description

technical field [0001] The invention relates to a method for preparing an iron-based superconductor, belonging to the technical field of high-temperature superconducting material preparation. Background technique [0002] Iron-based superconductors have a high critical transition temperature, relatively high upper critical field and irreversible field, so they are expected to be applied in strong electric fields with magnetic fields such as superconducting transformers, superconducting motors, and superconducting current limiters. At present, the commonly used preparation method of iron-based superconductors is the traditional solid-state reaction. This method requires a long heat treatment time when preparing iron-based superconductors. The long-time heat treatment leads to a large loss of some elements (such as: As and F), which reduces the quality of the prepared material, thereby affecting its performance; in addition, the iron-based superconductor prepared by the tradit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F1/00
Inventor 索红莉刘志勇郭志超马麟刘敏王毅
Owner BEIJING UNIV OF TECH
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