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Preparation method of nb3al superconducting material

A technology for superconducting materials and blanks, which is applied in the field of preparation of Nb3Al superconducting materials, can solve the problems of unavoidable raw material powder, difficult to expand large-scale production, complicated and difficult processes, etc., and achieves convenient large-scale production and reduced activation energy. , the effect of reducing the difficulty of synthesis

Inactive Publication Date: 2017-10-24
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The phase purity of this method is not high, and the equipment is not popular. Multiple adjustments are required in terms of ball type, ball milling medium, ball-to-material ratio, speed and time. In order to fully mix and avoid the formation of an alloy shell at the bottom of the ball mill tank, The ball mill tank also needs intermittent treatment, and the possibility of contamination of the raw material powder by the balls is unavoidable, so it is difficult to use for large-scale production
[0006] The process of high temperature synthesis is generally complex and difficult, or requires high equipment

Method used

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  • Preparation method of nb3al superconducting material
  • Preparation method of nb3al superconducting material
  • Preparation method of nb3al superconducting material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation method of the Nb3Al superconducting material of this embodiment includes:

[0036] a. Niobium powder pretreatment

[0037]Sprinkle Nb powder with a purity of 99.99% evenly in a quartz boat, put it into a tube furnace, introduce hydrogen gas with a purity of 99.99%, raise the temperature to 380°C, keep it for 3 hours, and take it out after cooling with the furnace to obtain pretreated niobium pink.

[0038] b. Tablet preparation

[0039] According to the Nb3Al molecular formula, the molar ratio of Nb and Al atoms is 3:1, and the Al powder with a purity of 99.99% and the pretreated niobium powder obtained in step a are weighed, and the pretreated niobium powder and aluminum powder are loaded into the agate grinding chamber. In a bowl, grind and mix evenly, and then use a mold to press and form, the pressing pressure is 10MPa, to make a block-shaped blank, wrap it with niobium foil, and put the wrapped block-shaped blank into a quartz boat.

[0040] c. S...

Embodiment 2

[0046] The preparation method of this example and the embodiment Nb3Al superconducting material, on the basis of embodiment 1, the only difference is:

[0047] a. Niobium powder pretreatment

[0048] Sprinkle Nb powder with a purity of 99.99% evenly in a quartz boat, put it into a tube furnace, feed a mixture of 4.7% hydrogen and 95.3% argon, raise the temperature to 380°C, and keep it warm for 3 hours. After the furnace is cooled, take it out to obtain pretreated niobium powder.

[0049] image 3 The XRD comparison chart of the pretreated niobium powder and the raw niobium powder prepared by the method of this example shows that the diffraction peak of the pretreated niobium powder is obviously broadened and there are trace impurities. According to the XRD data, the half width of the three strong peaks can be obtained. The average half width of the raw niobium powder is 0.1288 (2θ / °), and the average half width of the pretreated niobium powder is 0.468 (2θ / °). Calculated a...

Embodiment 3

[0052] The preparation method of this example and the embodiment Nb3Al superconducting material, on the basis of embodiment 1, the only difference is:

[0053] a. Niobium powder pretreatment

[0054] Sprinkle Nb powder with a purity of 99.99% evenly in a quartz boat, put it into a tube furnace, feed a mixture of 4.7% hydrogen and 95.3% argon, raise the temperature to 347°C, keep it warm for 3 hours, and then After the furnace is cooled, take it out to obtain pretreated niobium powder.

[0055] Figure 5 The XRD comparison chart of the pretreated niobium powder and the raw niobium powder prepared by the method of this example shows that the diffraction peak of the pretreated niobium powder is obviously broadened and there are trace impurities. According to the XRD data, the half peak width of the three strong peaks can be obtained. The average half peak width of the raw niobium powder is 0.1288 (2θ / °), and the average half peak width of the pretreated niobium powder is 0.4056...

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Abstract

The invention discloses a method for preparing a Nb3Al superconducting material. The physical and chemical action of niobium powder and hydrogen is used as the pretreatment process of fine niobium powder. The method includes heating the niobium powder in a hydrogen-argon mixed atmosphere, and the pretreated The niobium powder and the aluminum powder are uniformly mixed according to the stoichiometric ratio of Nb3Al, then pressed into tablets, and then sintered to obtain the Nb3Al superconducting material. The Nb3Al superconducting material does not introduce other metal impurities during the preparation process, has high purity and excellent superconducting performance. The invention has simple preparation process, short preparation cycle, low energy consumption, simple equipment, greatly reduces production cost, and is suitable for production of different scales.

Description

technical field [0001] The invention relates to a preparation method of Nb3Al superconducting material. Background technique [0002] High-field superconducting magnets play an irreplaceable and important role in technical fields such as nuclear magnetic resonance, ITER thermonuclear fusion, and high-energy particle accelerators. In the existing superconducting magnet preparation technology, magnets of 10T and below are made of NbTi alloy superconducting wire with excellent mechanical ductility. Due to the low critical magnetic field of NbTi alloys, higher magnetic fields above 10T require the use of A-15 type intermetallic compound superconducting materials with higher critical magnetic field characteristics to build magnets. Existing 10-20T magnets are mostly made of low-temperature superconductor NbTi alloy and Nb3Sn superconductor mixed coil nesting structure. The A-15 type intermetallic compound Nb3Sn superconducting material has good economy and high technical maturi...

Claims

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Application Information

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IPC IPC(8): H01B12/00H01B13/00
CPCH01B12/00H01B13/00Y02E40/60
Inventor 邓水全柴均博阚香张月萍张勇赵勇
Owner SOUTHWEST JIAOTONG UNIV