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Method for preparing iron-based superconductor through short-time solid-phase sintering technology

An iron-based superconductor and solid-phase sintering technology, which can be used in cable/conductor manufacturing, electrical components, circuits, etc., can solve the problems of low efficiency of iron-based superconductors

Inactive Publication Date: 2010-11-10
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the traditional solid-state sintering technology usually requires at least 40 hours of holding time for the preparation of iron-based superconductors, which makes it very inefficient to use this method to prepare iron-based superconductors

Method used

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  • Method for preparing iron-based superconductor through short-time solid-phase sintering technology
  • Method for preparing iron-based superconductor through short-time solid-phase sintering technology
  • Method for preparing iron-based superconductor through short-time solid-phase 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 glove box protected by high-purity argon gas, SmAs powder, Fe powder, Fe 2 o 3 Powder, FeF 3 The powder is mixed according to the ratio of 30:12:8:2.4; then it is fully ground; it is pressed into a sheet by a hydraulic press, and t...

Embodiment 2

[0022] Example 2: CeO 0.8 f 0.2 Preparation of FeAs Superconductor

[0023] Step 1: Preparation of initial powder

[0024] 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: room temperature-400°C, heating rate is 5°C / min; 400°C-600°C, heating rate is 5°C / min; 600°C for 10 hours; 600°C-900°C heating rate is 5°C / min; heat preservation at 900°C for 20 hours; finally cool the furnace to room temperature.

[0025] Step 2: CeO 0.8 f 0.2 Preparation of FeAs Superconductor

[0026] In a glove box protected by high-purity argon gas, CeAs powder, Fe powder, Fe 2 o 3 Powder, FeF3 The powder is mixed according to the ratio of 30:12:8:2.4; then it is fully ground; it is pressed into a sheet by a hydraulic press, and the use pressure...

Embodiment 3

[0027] Example 3: NdO 0.7 f 0.3 Preparation of FeAs Superconductor

[0028] Step 1: Preparation of initial powder

[0029] 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.

[0030] Step 2: NdO 0.7 f 0.3 Preparation of FeAs Superconductor

[0031] In a glove box protected by high-purity argon gas, NdAs powder, Fe powder, Fe 2 o 3 Powder, FeF 3 The powder is mixed according to the ratio of 30:13:7:3.6; then it is fully ground; it is pressed into a sheet by a hydraul...

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Abstract

The invention discloses a method for preparing an iron-based superconductor through a short-time solid-phase sintering technology, which comprises the following steps: mixing Ln and As powder by the molar ratio of 1: (1 to 1.1) under the high-purity Ar protection atmosphere, sealing the mixed powder in a high-vacuum quartz tube for hot treatment, finally furnace cooling to room temperature to obtain LnAs powder; in a glove box protected by high-purity argon, mixing and grinding the LnAs powder, Fe powder, Fe2O3 powder and FeF3 powder by the molar ratio of 3: (1+x): (1-x): (1.1 to 1.5)x and tabletting the mixed powder; then annealing under high vacuum, furnace cooling to room temperature to finally prepare the LnO1-xFxFeAs superconductor, wherein Ln=La, Ce, Pr, Nd, Sm and Eu, and x is more than 0 and less than 0.6. The method improves the performance of the iron-based superconductor, and simultaneously improves the iron-based superconductor preparation efficiency.

Description

technical field [0001] The invention relates to a method for preparing an iron-based superconductor, in particular to a short-time solid-phase sintering technique for preparing LnO 1-x f x The invention relates to a method for FeAs (La, Ce, Pr, Nd, Sm, Eu, etc.) iron-based superconductors, belonging to the technical field of preparation of iron-based superconducting materials. Background technique [0002] Iron-based superconductors have many superior properties. Under the conditions of 40-50K temperature range and high-field use, their superconducting performance has reached and exceeded that of the traditional low-temperature superconducting material Nb 3 Sn and high-temperature YBCO coated superconducting materials and Bi-based superconducting wire strips. In addition, Nb 3 The operating temperature of Sn needs to be maintained by expensive liquid helium, and the operating cost is high, while the iron-based superconductor can use a refrigerator to reach its superconduc...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/40H01B13/00
Inventor 刘志勇索红莉马麟刘敏叶帅田辉袁慧萍邱火勤周美玲
Owner BEIJING UNIV OF TECH
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