A rapid preparation of nb 3 al superconductor method

A superconducting and fast technology, applied in the field of materials, can solve the problems of low superconducting transition temperature, low critical current density, and difficulty in preparation, and achieve high superconducting transition temperature, high critical current density, and good grain connectivity Effect

Active Publication Date: 2022-08-09
FUJIAN NORMAL UNIV
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  • Claims
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Problems solved by technology

And the Nb obtained by the low-temperature diffusion method 3 The Al superconducting phase deviates from the stoichiometric ratio, and the superconducting transition temperature (Tc) is low, making it difficult to prepare high-quality Nb 3 Al phase
Nb prepared by mechanical alloying 3 The structure of Al sample is loose, the critical current density (Jc) is low, and the superconductivity is poor
The fast heating and fast cooling method must accurately control the RHQ parameters, otherwise it is very easy to break the wire, and the uneven performance of the prepared wire has not yet been able to achieve commercial production

Method used

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  • A rapid preparation of nb <sub>3</sub> al superconductor method
  • A rapid preparation of nb <sub>3</sub> al superconductor method
  • A rapid preparation of nb <sub>3</sub> al superconductor method

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preparation example Construction

[0037] see figure 1 , the Nb provided by the present invention 3 The preparation method of Al superconductor comprises the following steps:

[0038] Step S10, the Nb powder and the Al powder are weighed according to the stoichiometric ratio of 74:26, and then fully mixed in a planetary ball mill to obtain a mixed powder;

[0039] In step S20, the mixed powder is placed in a discharge plasma sintering furnace for heating and pressure sintering at a temperature of 1200°C to 1400°C to obtain Nb 3 Al superconductor;

[0040] Step S30, the Nb sintered by SPS 3 The Al superconductor was put into a quartz tube for post-annealing treatment at a temperature of 850°C to 950°C and a time of 1.8 to 2.2 hours. After sintering, it was cooled in the furnace to obtain post-annealed Nb 3 Al superconductor.

[0041] In the step S10, in the glove box, the Nb powder and the Al powder are weighed according to the stoichiometric ratio of 74:26, and then put into a ball mill jar, and then fully...

Embodiment 1

[0046]Under the protection of argon, Nb powder with a particle size of 10.5 μm and a purity of 99.95% and Al powder with a particle size of 325 mesh and a purity of >99.7% were weighed according to the stoichiometric ratio of 74:26, and then milled in a planetary ball mill. Fully mixed in the tank, the ball milling speed is 300 PRM, the ball milling time is 30 min, and the ball-to-material ratio is 10:1 to obtain mixed powder.

[0047] The mixed powder was placed in a spark plasma sintering furnace (SPS) to maintain a vacuum of 2.5×10 -2 Pa, the pressure is 25Mpa, the sintering temperature is 1200°C, the heating rate is 50°C / min, and the holding time is 5min to obtain Nb 3 Al superconductor.

Embodiment 2

[0049] Under the protection of argon, Nb powder with a particle size of 10.5μm and a purity of 99.95% and Al powder with a particle size of -325 mesh and a purity of >99.7% were weighed according to the stoichiometric ratio of 74:26, and then placed on the planet Mix thoroughly in a ball milling tank, the ball milling speed is 300 PRM, the ball milling time is 30 min, and the ball-to-material ratio is 10:1 to obtain mixed powder.

[0050] The mixed powder was placed in a spark plasma sintering furnace (SPS) to maintain a vacuum of 2.5×10 -2 Pa, the pressure is 25Mpa, the sintering temperature is 1300°C, the heating rate is 50°C / min, and the holding time is 5min to obtain Nb 3 Al superconductor.

[0051] The method of Example 2 is basically the same as that of Example 1, the difference is that the sintering temperature of SPS is 1300°C.

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Abstract

The invention discloses a rapid preparation of Nb 3 The method of Al superconductor, the method includes the following steps: weighing Nb powder and Al powder according to the stoichiometric ratio of 74:26, and then fully mixing them in a planetary ball mill to obtain a mixed powder; placing the mixed powder in a discharge plasma Heat and pressure sintering at a temperature of 1200 ° C ~ 1400 ° C in a bulk sintering furnace to obtain Nb 3 Al superconductor; Nb after SPS sintering 3 The Al superconductor was put into a quartz tube for post-annealing at a temperature of 850°C to 950°C, and then cooled in the furnace after sintering to obtain post-annealed Nb 3 Al superconductor. Preparation of Nb provided by the present invention 3 The method of Al superconductor is novel, the production efficiency is high, and it is more energy-saving and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a rapid preparation of Nb 3 Methods for Al superconductors. Background technique [0002] Nb 3 Al superconducting material has better strain resistance and higher current transport properties at high fields, and is considered as a substitute for Nb 3 Sn is an ideal material for high-field superconducting magnets. [0003] Nb 3 The conventional preparation methods of Al superconducting materials include: low temperature diffusion method, mechanical alloying method and rapid heating and rapid cooling method (RHQT). The Nb obtained by low temperature diffusion method 3 The Al superconducting phase deviates from the stoichiometric ratio and the superconducting transition temperature (Tc) is low, making it difficult to prepare high-quality Nb 3 Al phase. Nb prepared by mechanical alloying 3 The Al samples have loose structure, low critical current density (Jc) and poor super...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C27/02B22F3/105B22F3/24C22F1/18C22F1/02
CPCC22C1/045C22C27/02B22F3/105B22F3/24C22F1/18C22F1/02B22F2003/1051B22F2003/248Y02E40/60
Inventor 陈小凤赵勇王丽丽周大进
Owner FUJIAN NORMAL UNIV
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