Preparation method of Nb3Al superconducting material

A technology of superconducting material and solid solution is applied in the field of preparation of Nb3Al superconducting material, which can solve the problems of low Al content and grain growth, and achieve the effects of low cost, small grain size and simple preparation method.

Active Publication Date: 2015-05-20
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of Nb 3 Preparation method of Al superconducting material, solves Nb existing in prior art 3 Problems of low Al content and grain growth in Al superconducting materials

Method used

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  • Preparation method of Nb3Al superconducting material
  • Preparation method of Nb3Al superconducting material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In the first step, take Nb powder with a purity of 99.99% and Al powder with a purity of 99.99%, mix it according to the ratio of Nb and Al atomic ratio of 3:1, weigh 5g of the uniformly mixed powder and place it in a boron nitride crucible, Install a water-cooled copper casting mold on the lower part of the crucible, and then vacuumize the vacuum chamber of the strip machine to 10 -3 Pa, and then fill the cavity with argon to normal pressure. See belt spinner figure 1 , including a vacuum chamber 1, a crucible 2 and a water-cooled copper mold 4 are arranged in the vacuum chamber 1, the crucible 2 has a power supply 3, the vacuum chamber 1 is connected with the intake pipe 5, the exhaust pipe 6, and the two-way pipe 7, and the two-way pipe 7 is connected with the The molecular pump 8 and the mechanical pump 9 are connected.

[0024] The second step is to turn on the power supply, control the heating temperature of the induction coil to 2450°C, keep it for 20 minutes t...

Embodiment 2

[0028] In the first step, take Nb powder with a purity of 99.99% and Al powder with a purity of 99.99%, mix it according to the ratio of Nb and Al atomic ratio of 3:1, weigh 2 g of the powder evenly mixed and place it in a boron nitride crucible, Install a water-cooled copper casting mold on the lower part of the crucible, and then vacuumize the vacuum chamber of the strip machine to 10 -4 Pa, then fill the chamber with argon to normal pressure, refer to figure 1 ;

[0029] The second step is to turn on the power supply, control the heating temperature of the induction coil to 2450°C, keep it for 20 minutes to make Nb and Al form a liquid phase, then cool down to 1950°C at a rate of 50°C / h, and keep it for 30 minutes to form a solid-liquid coexistence phase, and then Quickly fill the crucible cavity with high-purity argon, and use the pressure to spray the melt into the mold through the nozzle at the bottom of the crucible to obtain supersaturated solid solution Nb(Al)ss;

...

Embodiment 3

[0033] In the first step, take Nb powder with a purity of 99.99% and Al powder with a purity of 99.99%, mix it according to the ratio of Nb and Al atomic ratio of 3:1, weigh 8g of powder mixed uniformly and place it in a boron nitride crucible, Install a water-cooled copper casting mold on the lower part of the crucible, and then vacuumize the vacuum chamber of the strip machine to 10 -5 Pa, then fill the chamber with argon to normal pressure, refer to figure 1 ;

[0034] The second step is to turn on the power supply, control the heating temperature of the induction coil to 2450°C, keep it for 20 minutes to make Nb and Al form a liquid phase, then cool down to 2040°C at a rate of 50°C / h, and keep it for 30 minutes to form a solid-liquid coexistence phase, and then Quickly fill the crucible cavity with high-purity argon, and use the pressure to spray the melt into the water-cooled copper mold through the nozzle at the bottom of the crucible to obtain supersaturated solid solu...

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Abstract

The invention relates to a preparation method of an Nb3Al superconducting material. The preparation method comprises the following steps: heating Nb powder and Al powder by using a belt throwing machine and through an induction coil; after completely melting, cooling to form a solid-liquid coexistence body; introducing high-purity argon and jetting melt in a water-cooling copper casting mould or a rolling wheel which rotates at high speed to form a supersaturated solid solution; performing low-temperature heat treatment to obtain the Nb3Al superconducting material. According to the preparation method of the Nb3Al superconducting material, the problems that the Al content is slightly low in the process of preparing the Nb3Al superconducting material and crystal grains grow in the high-temperature heat treatment process in the prior art are overcome; the Al content of the obtained Nb3Al superconducting material is close to 25%, the crystal grains are small, and the superconducting transition temperature and the critical current density can reach ideal values.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of superconducting materials, and relates to a kind of Nb 3 Preparation method of Al superconducting material. Background technique [0002] Compared to NbTi and Nb 3 Sn superconducting material, intermetallic compound Nb with A15 structure 3 Al has higher critical magnetic field and critical current density, and Nb at high field 3 The stress-strain relationship study of Al shows that the material has very good strain resistance and good radiation sensitivity. It is an ideal material for high-field applications such as large-scale nuclear fusion reactors, high-energy particle accelerators, and NMR in the future. [0003] Since the Nb / Al diffusion distance is very small, the Nb prepared by the low-temperature diffusion method 3 The Al content in the Al superconducting material is lower than 25%, which makes the superconducting transition temperature lower than the ideal value, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/06H01B12/00
CPCY02E40/60
Inventor 崔利军闫果潘熙锋王大友侯艳荣王韵涵冯勇刘向宏张平祥
Owner 西部超导材料科技股份有限公司
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