Method for preparing Mg0.8CUO.2B2 superconduct bulk material

A technology of mg0.8cu0.2b2 and superconducting blocks, which is applied in the usage of superconducting elements, the manufacture/processing of superconducting devices, superconducting devices, etc., can solve the problems of complex reaction process, large energy consumption, and large investment in equipment , to achieve the effect of rapid reaction process, energy saving and low investment

Inactive Publication Date: 2006-01-18
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

The above methods generally react at 600-900°C, under high pressure or normal pressure, and keep warm for 3 to 10 hours. The process is character

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  • Method for preparing Mg0.8CUO.2B2 superconduct bulk material
  • Method for preparing Mg0.8CUO.2B2 superconduct bulk material
  • Method for preparing Mg0.8CUO.2B2 superconduct bulk material

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Embodiment Construction

[0013] The present invention adopts powders of Mg and B. First, the powders of Mg, Cu and B are weighed in a stoichiometric ratio of 0.8:0.2:2, and then 1% of the weight of the weighed Mg is added. Then put the weighed Mg, Cu powder and B powder in a ball mill for grinding and mixing. The speed of the ball mill is 200 revolutions per minute, and the time for ball milling is 2 hours. The grinding balls are mixed with Mg, Cu, and B powders. The total weight ratio of the materials is 35-40:1. Press the milled powder into a sheet or column blank under a pressure of 150Mpa, and put it into a vacuum furnace. The vacuum furnace is evacuated or filled with inert gas, and preheated at a heating rate of 30℃ / min. Use an arc to ignite the billet at the top of the billet at ℃. When the ignition temperature reaches 700°C, the arc is extinguished. The reaction is allowed to continue for 3 seconds. The adiabatic temperature is 1461°C. Mg can be obtained by natural cooling to room temperature. 0.8...

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Abstract

This invention relates to a method for preparing Mg0.8CU0.2B2 superconductive block material, which comprises the following steps: mixing the powder stock evenly in the ball grinder, compressing it into blank, heating the blank in the vacuum furnace protected with inactive gas to certain temperature, using arc ignition, activating the reaction, then, cooling it naturally to the ambient temperature to get the production with its critical temperature Tc=36.9K, when T=5K, at self field, critical current density Ic=6.8X105A/cm2. Compared with other methods, the Mg0.8CU0.2B2 superconductive material prepared by this method has the advantages of simpler process, shorter time, less energy consumption, higher production efficiency, even product component and being suitable for batch production.

Description

Technical field [0001] The invention relates to a preparation method of a superconducting block material. Background technique [0002] Metal compound superconducting material MgB 2 Its ductility is much better than that of oxide superconductors, and it is easy to form. Mg and B are relatively cheap and simple to synthesize, but their own shortcomings limit their development. Since doping elements can change MgB later 2 Deficiencies, especially its superconducting transition temperature and critical current density (J 2 )Have a great impact. Doped MgB is currently prepared at home and abroad 2 The main methods are PLD (pulsedlaser deposition) method, co-evaporation method, suspension deposition method, magnesium diffusion method, PIT (powder intube) method, etc., has prepared bulk, single crystal, wire, strip, film and powder, etc. MgB 2 Superconducting materials. The above method generally reacts at 600-900°C, high pressure or normal pressure, and heats for 3-10 hours. The proce...

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Application Information

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IPC IPC(8): H01B12/00H01B13/00H01L39/24C04B35/622
CPCY02E40/64Y02E40/60
Inventor 冯旺军夏天东杨鹏源
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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