Preparation method of Fe (Se, Te) superconducting wire

Abstract

The invention discloses a preparation method of a Fe (Se, Te) superconducting wire, which comprises the following steps of: 1, grinding mixed powder consisting of selenium powder and tellurium powder; 2, pressing the ground mixed powder to obtain a Se-Te green body; 3, sintering the Se-Te green body to obtain a SeTe block body; 4, performing high-energy ball milling on the SeTe block to obtain SeTe solid solution powder; and 5, loading the SeTe solid solution powder into a Fe tube to prepare a tube body, and then carrying out sintering treatment to obtain the Fe (Se, Te) superconducting wire. According to the method, the Fe (Se, Te) superconducting wire is prepared by adopting the diffusion method, the diffusion reaction of the SeTe solid solution and the Fe sheath is regulated and controlled by accurately controlling the diffusion heat treatment process, the in-situ generated Fe (Se, Te) superconducting layer is obtained, the problem of poor grain boundary connectivity of a superconducting core wire in a traditional powder tubing method is solved, and the superconducting current-carrying performance of the Fe (Se, Te) superconducting wire is improved.

Description

technical field

[0001] The invention belongs to the technical field of superconducting material preparation, in particular to a preparation method of Fe(Se,Te) superconducting wire. Background technique

[0002] LaO with a critical temperature of 26K was first reported by Hosono's group in Japan in 2008 1-x F x FeAs iron-based superconducting materials opened the prelude to the research of iron-based superconducting materials. Iron-based superconducting materials have a very high upper critical field (H c2 ) and the critical current density (J c ) is relatively high and decays very slowly with the magnetic field, making it a substitute for NbTi and Nb in future applications at low temperature and high field. 3 Sn becomes possible.

[0003] Among many iron-based superconducting materials, although the critical temperature of FeSe-based superconducting materials is low, the critical temperature T can be effectively increased by doping Te at the Se site. c , making it sui...

Examples

Embodiment 1

[0031] This embodiment includes the following steps:

[0032] Step 1, in a glove box full of inert gas, place the mixed powder in an agate mortar and grind for 30min; the mixed powder is composed of selenium powder and tellurium powder in a molar ratio of 1.0:1.0;

[0033] The mass purity of the selenium powder and the tellurium powder are both 99.99%;

[0034] Step 2, in a glove box filled with inert gas, put the mixed powder after grinding in step 1 into a tableting die and seal it, then take it out and place it on a tableting machine for pressing to obtain a Se-Te green body; The pressure of the pressing treatment is 10MPa, and the time is 10min;

[0035]Step 3: The Se-Te body obtained in step 2 is taken out from the tableting die and placed in a quartz tube, sealed with a oxyhydrogen flame, and then placed in a sintering furnace for sintering treatment, and cooled to room temperature to obtain SeTe block; the sintering treatment is carried out in an argon atmosphere, and...

Embodiment 2

[0049] This embodiment includes the following steps:

[0050] Step 1. In a glove box filled with inert gas, the mixed powder is placed in an agate mortar and ground for 120 min; the mixed powder is composed of selenium powder and tellurium powder in a molar ratio of 1.5:1.0;

[0051] The mass purity of the selenium powder and the tellurium powder are both 99.99%;

[0052] Step 2, in a glove box filled with inert gas, put the mixed powder after grinding in step 1 into a tableting die and seal it, then take it out and place it on a tableting machine for pressing to obtain a Se-Te green body; The pressure of the pressing treatment is 18MPa, and the time is 10min;

[0053] Step 3: The Se-Te body obtained in step 2 is taken out from the tableting die and placed in a quartz tube, sealed with a oxyhydrogen flame, and then placed in a sintering furnace for sintering treatment, and cooled to room temperature to obtain SeTe block; the sintering treatment is carried out in an argon atm...

Embodiment 3

[0062] This embodiment includes the following steps:

[0063] Step 1, in a glove box filled with inert gas, place the mixed powder in an agate mortar and grind for 60min; the mixed powder is composed of selenium powder and tellurium powder in a molar ratio of 1.2:1.0;

[0064] The mass purity of the selenium powder and the tellurium powder are both 99.99%;

[0065] Step 2, in a glove box filled with inert gas, put the mixed powder after grinding in step 1 into a tableting die and seal it, then take it out and place it on a tableting machine for pressing to obtain a Se-Te green body; The pressure of the pressing treatment is 5MPa, and the time is 10min;

[0066] Step 3: The Se-Te body obtained in step 2 is taken out from the tableting die and placed in a quartz tube, sealed with a oxyhydrogen flame, and then placed in a sintering furnace for sintering treatment, and cooled to room temperature to obtain SeTe block; the sintering treatment is carried out in an argon atmosphere,...

technical field

[0001] The invention belongs to the technical field of superconducting material preparation, in particular to a preparation method of Fe(Se,Te) superconducting wire. Background technique

[0002] LaO with a critical temperature of 26K was first reported by Hosono's group in Japan in 2008 1-x F x FeAs iron-based superconducting materials opened the prelude to the research of iron-based superconducting materials. Iron-based superconducting materials have a very high upper critical field (H c2 ) and the critical current density (J c ) is relatively high and decays very slowly with the magnetic field, making it a substitute for NbTi and Nb in future applications at low temperature and high field. 3 Sn becomes possible.

[0003] Among many iron-based superconducting materials, although the critical temperature of FeSe-based superconducting materials is low, the critical temperature T can be effectively increased by doping Te at the Se site. c , making it sui...

Examples

Embodiment 1

[0031] This embodiment includes the following steps:

[0032] Step 1, in a glove box full of inert gas, place the mixed powder in an agate mortar and grind for 30min; the mixed powder is composed of selenium powder and tellurium powder in a molar ratio of 1.0:1.0;

[0033] The mass purity of the selenium powder and the tellurium powder are both 99.99%;

[0034] Step 2, in a glove box filled with inert gas, put the mixed powder after grinding in step 1 into a tableting die and seal it, then take it out and place it on a tableting machine for pressing to obtain a Se-Te green body; The pressure of the pressing treatment is 10MPa, and the time is 10min;

[0035]Step 3: The Se-Te body obtained in step 2 is taken out from the tableting die and placed in a quartz tube, sealed with a oxyhydrogen flame, and then placed in a sintering furnace for sintering treatment, and cooled to room temperature to obtain SeTe block; the sintering treatment is carried out in an argon atmosphere, and...

Embodiment 2

[0049] This embodiment includes the following steps:

[0050] Step 1. In a glove box filled with inert gas, the mixed powder is placed in an agate mortar and ground for 120 min; the mixed powder is composed of selenium powder and tellurium powder in a molar ratio of 1.5:1.0;

[0051] The mass purity of the selenium powder and the tellurium powder are both 99.99%;

[0052] Step 2, in a glove box filled with inert gas, put the mixed powder after grinding in step 1 into a tableting die and seal it, then take it out and place it on a tableting machine for pressing to obtain a Se-Te green body; The pressure of the pressing treatment is 18MPa, and the time is 10min;

[0053] Step 3: The Se-Te body obtained in step 2 is taken out from the tableting die and placed in a quartz tube, sealed with a oxyhydrogen flame, and then placed in a sintering furnace for sintering treatment, and cooled to room temperature to obtain SeTe block; the sintering treatment is carried out in an argon atm...

Embodiment 3

[0062] This embodiment includes the following steps:

[0063] Step 1, in a glove box filled with inert gas, place the mixed powder in an agate mortar and grind for 60min; the mixed powder is composed of selenium powder and tellurium powder in a molar ratio of 1.2:1.0;

[0064] The mass purity of the selenium powder and the tellurium powder are both 99.99%;

[0065] Step 2, in a glove box filled with inert gas, put the mixed powder after grinding in step 1 into a tableting die and seal it, then take it out and place it on a tableting machine for pressing to obtain a Se-Te green body; The pressure of the pressing treatment is 5MPa, and the time is 10min;

[0066] Step 3: The Se-Te body obtained in step 2 is taken out from the tableting die and placed in a quartz tube, sealed with a oxyhydrogen flame, and then placed in a sintering furnace for sintering treatment, and cooled to room temperature to obtain SeTe block; the sintering treatment is carried out in an argon atmosphere,...

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