Preparation method of low-cost NbTiZrHfTa high-entropy superconducting wire

Abstract

The invention discloses a preparation method of a low-cost NbTiZrHfTa high-entropy superconducting wire, and the method comprises the steps: 1, weighing single metal powder according to a chemical atomic ratio, and putting the powder into an agate mortar for grinding to obtain mixed powder; secondly, the mixed powder is loaded into an Nb / Cu composite tube with one end sealed, and a high-entropy superconducting alloy composite body is obtained through assembling; 3, processing the high-entropy superconducting alloy complex into a raw wire; and 4, sealing the raw wire in a quartz tube protected by argon, and carrying out high-temperature diffusion heat treatment to obtain the NbTiZrHfTa high-entropy superconducting wire. According to the high-entropy superconducting wire and the preparation method thereof, all the elementary metal powder is adopted as raw materials, the raw wire is processed after tubing and compounding, and then the high-entropy superconducting wire is prepared through high-temperature diffusion heat treatment, so that the rapid and low-cost preparation process is achieved, the purity and content of a high-entropy superconducting alloy phase are improved, and the high-performance and high-uniformity high-entropy superconducting wire is obtained; the method is suitable for the optimization research of the proportion of the high-entropy superconducting alloy wire.

Description

Technical Field

[0001] The invention belongs to the technical field of high entropy superconducting wires, and in particular relates to a method for preparing a low-cost NbTiZrHfTa high entropy superconducting wire. Background Art

[0002] NbTiZrHfTa high entropy superconducting material is a newly discovered superconducting material. According to the current foreign reports, its film has obtained 10 6 A / cm 2 It has high current-carrying performance and is a very promising superconducting material.

[0003] At present, the largest application market for superconducting materials is superconducting magnets, and to make superconducting magnets, superconducting materials must first be made into superconducting wires. However, alloy wires prepared by conventional methods first need to prepare high-entropy superconducting powders. However, high-entropy superconductors are still niche alloy powders, and there are very few manufacturers. Even if they can produce a single batch of powder, the quantity is relatively large, and the price is very high. This is very unfavorable for the research and development of new materials whose ratios have not yet been determined. Therefore, it is very important to develop a preparation process for low-cost high-entropy superconducting alloys for research and development for the development of NbTiZrHfTa high-entropy superconducting alloy wires. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a low-cost preparation method of NbTiZrHfTa high-entropy superconducting wire in view of the deficiencies of the above-mentioned prior art. The method uses each elemental metal powder as raw material, processes it into raw wire after tube assembly and compounding, and then prepares the high-entropy superconducting wire through high-temperature diffusion heat treatment, realizing a fast and low-cost preparation process, and obtaining high-performance and high-uniformity high-entropy superconducting wire, which is particularly suitable for the optimization research of the ratio of high-entropy superconducting alloy wires, filling the gap of the existing lack of low-cost and high-efficiency high-entropy superconducting alloy preparation process.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: step 1, weighing each elemental metal powder according to the chemical atomic ratio of Nb:Ti:Zr:Hf:Ta=1-2:1-2:1-2:1-2:1-2, and then putting all of them into an agate mortar for grinding to obtain a mixed powder;

[0006] Step 2: Put the mixed powder obtained in step 1 into a Nb / Cu composite tube with a capped end to assemble a high entropy superconducting alloy composite;

[0007] Step 3, processing the high entropy superconducting alloy composite assembled in step 2 into raw wire;

[0008] Step 4: seal the raw wire obtained in step 3 in a quartz tube protected by argon gas, and then perform high-temperature diffusion heat treatment to form a high-entropy superconducting alloy phase to obtain a NbTiZrHfTa high-entropy superconducting wire.

[0009] The above-mentioned method for preparing a low-cost NbTiZrHfTa high-entropy superconducting wire is characterized in that the grinding time in step 1 is 10 minutes to 30 minutes.

[0010] The above-mentioned method for preparing a low-cost NbTiZrHfTa high-entropy superconducting wire is characterized in that the processing method in step three is drawing, and the pass processing amount is 10%, and the wire diameter of the raw wire is φ1mm~φ4mm.

[0011] The above-mentioned method for preparing a low-cost NbTiZrHfTa high-entropy superconducting wire is characterized in that the temperature of the high-temperature diffusion heat treatment in step 4 is 700°C to 1100°C, and the time is 1h to 24h.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] 1. The present invention uses each elemental metal powder as raw material, processes it into raw wire after tube compounding, and then prepares high-entropy superconducting wire through high-temperature diffusion heat treatment. Compared with the alloy method, the preparation process is simple and has strong universality. The raw materials used can be purchased on the market, and the cost is low (less than 1 / 100 of the alloy method), which realizes a fast and low-cost preparation process, and is particularly suitable for the optimization study of the ratio of high-entropy superconducting alloy wires.

[0014] 2. The Nb in the inner layer of the Nb / Cu composite tube used in the present invention effectively isolates the high entropy superconducting alloy powder, i.e., the mixed powder, from contact with Cu, avoids the reaction between the high entropy superconducting alloy powder and the Cu layer, and improves the purity and content of the high entropy superconducting alloy phase, thereby obtaining a high-performance, high-uniformity high entropy superconducting wire.

[0015] 3. The Nb strength of the inner layer in the Nb / Cu composite tube used in the present invention is relatively high, which avoids the contact between the high-entropy superconducting alloy powder, i.e. the mixed powder, and the Cu with lower strength, thereby causing the high-entropy superconducting alloy powder to be embedded in the Cu layer during the processing, resulting in serious uneven performance of the high-entropy superconducting wire. At the same time, the Cu layer has very high plasticity, which is conducive to achieving uniform processing of long wires and obtaining high-performance, high-uniformity high-entropy superconducting wires.

[0016] The technical solution of the present invention is further described in detail below through embodiments. DETAILED DESCRIPTION

[0017] Example 1

[0018] This embodiment includes the following steps:

[0019] Step 1: weigh each elemental metal powder according to the chemical atomic ratio of Nb:Ti:Zr:Hf:Ta=1:1:1:1:1, and then put all of them into an agate mortar and grind them for 10 minutes to obtain a mixed powder;

[0020] Step 2: Put the mixed powder obtained in step 1 into a Nb / Cu composite tube with a capped end to assemble a high entropy superconducting alloy composite;

[0021] Step 3: drawing the high entropy superconducting alloy composite assembled in step 2 into a raw wire with a wire diameter of φ4 mm, and the processing amount per pass is 10%;

[0022] Step 4: seal the raw wire obtained in step 3 in a quartz tube protected by argon gas, and then perform high-temperature diffusion heat treatment at a temperature of 1100° C. for 24 hours to form a high-entropy superconducting alloy phase to obtain NbTiZrHfTa high-entropy superconducting wire.

[0023] Scanning electron microscopy shows that the content of high entropy superconducting alloy phase in the NbTiZrHfTa high entropy superconducting wire prepared in this embodiment exceeds 90%, reaching the phase content index of high-performance superconducting wire, and has a 4000A / cm 2 Above superconducting current carrying performance.

[0024] Example 2

[0025] This embodiment includes the following steps:

[0026] Step 1: weigh each elemental metal powder according to the chemical atomic ratio of Nb:Ti:Zr:Hf:Ta=1:1:2:2:2, and then put all of them into an agate mortar and grind for 30 minutes to obtain a mixed powder;

[0027] Step 2: Put the mixed powder obtained in step 1 into a Nb / Cu composite tube with a capped end to assemble a high entropy superconducting alloy composite;

[0028] Step 3, drawing the high entropy superconducting alloy composite assembled in step 2 into a raw wire with a wire diameter of φ1 mm, and the pass processing amount is 10%;

[0029] Step 4: seal the raw wire obtained in step 3 in a quartz tube protected by argon gas, and then perform high-temperature diffusion heat treatment at a temperature of 700°C for 1 hour to form a high-entropy superconducting alloy phase to obtain NbTiZrHfTa high-entropy superconducting wire.

[0030] Scanning electron microscopy shows that the content of high entropy superconducting alloy phase in the NbTiZrHfTa high entropy superconducting wire prepared in this embodiment exceeds 50%, reaching the phase content index of high-performance superconducting wire, and has a 1000A / cm 2 Above superconducting current carrying performance.

[0031] Example 3

[0032] This embodiment includes the following steps:

[0033] Step 1: weigh each elemental metal powder according to the chemical atomic ratio of Nb:Ti:Zr:Hf:Ta=1:1:1.5:1.5:1.5, and then put all of them into an agate mortar and grind them for 15 minutes to obtain a mixed powder;

[0034] Step 2: Put the mixed powder obtained in step 1 into a Nb / Cu composite tube with a capped end to assemble a high entropy superconducting alloy composite;

[0035] Step 3: drawing the high entropy superconducting alloy composite assembled in step 2 into a raw wire with a wire diameter of φ2 mm, and the pass processing amount is 10%;

[0036] Step 4: seal the raw wire obtained in step 3 in a quartz tube protected by argon gas, and then perform high-temperature diffusion heat treatment at a temperature of 900° C. for 12 hours to form a high-entropy superconducting alloy phase to obtain NbTiZrHfTa high-entropy superconducting wire.

[0037] Scanning electron microscopy shows that the content of high entropy superconducting alloy phase in the NbTiZrHfTa high entropy superconducting wire prepared in this embodiment exceeds 75%, reaching the phase content index of high-performance superconducting wire, and has a 2000A / cm 2 Above superconducting current carrying performance.

[0038] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent change made to the above embodiment according to the technical essence of the invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for preparing a low-cost NbTiZrHfTa high-entropy superconducting wire, characterized in that: The method comprises the following steps: Step 1, weighing each elemental metal powder according to the chemical atomic ratio of Nb:Ti:Zr:Hf:Ta=1-2:1-2:1-2:1-2:1-2, and then putting all of them into an agate mortar for grinding to obtain a mixed powder; Step 2: Put the mixed powder obtained in step 1 into a Nb / Cu composite tube with a capped end to assemble a high entropy superconducting alloy composite; Step 3, processing the high entropy superconducting alloy composite assembled in step 2 into raw wire; Step 4: seal the raw wire obtained in step 3 in a quartz tube protected by argon gas, and then perform high-temperature diffusion heat treatment to form a high-entropy superconducting alloy phase to obtain a NbTiZrHfTa high-entropy superconducting wire.

2. The method for preparing a low-cost NbTiZrHfTa high-entropy superconducting wire according to claim 1, characterized in that: The grinding time in step 1 is 10 min to 30 min.

3. The method for preparing a low-cost NbTiZrHfTa high-entropy superconducting wire according to claim 1, characterized in that: The processing method in step three is drawing, and the processing amount per pass is 10%, and the wire diameter of the raw wire is φ1mm~φ4mm.

4. The method for preparing a low-cost NbTiZrHfTa high-entropy superconducting wire according to claim 1, characterized in that: The temperature of the high temperature diffusion heat treatment in step 4 is 700° C. to 1100° C., and the time is 1 h to 24 h.