Preparation method of MgB2 superconducting wire

Abstract

The invention discloses a preparation method of an MgB2 superconducting wire. The preparation method comprises the steps of preparing magnesium diboride crystal as an inner core, including the steps of firstly, dissolving magnesium di-n-propyl alcohol and diborane in a nonpolar solvent, reacting to obtain magnesium borohydride, and separating impurities by a solid-liquid separation process; secondly, leading in argon to form protective atmosphere under standard pressure, and carrying out thermal decomposition on the obtained magnesium borohydride, so that magnesium borate is formed; encapsulating the magnesium diboride crystal inner core into metal, and drawing the inner core and the metal to obtain the superconducting wire with the magnesium diboride inner core. The magnesium diboride can be prepared by the preparation method under a reducing condition and prevented from being polluted by an oxide by-product, and the magnesium diboride inner core with small crystal particles and good degree of crystallinity is obtained, so as to prepare the superconducting wire with excellent performance.

Description

technical field [0001] The invention relates to a method for manufacturing a superconducting wire, in particular to a method for manufacturing a superconducting wire including magnesium diboride. Background technique [0002] With the rapid development of science and technology, more and more people begin to use various superconductors, such as superconducting tapes or superconducting wires. Magnesium diboride has the highest transition temperature among metal superconductors. Due to its high transition temperature, if the purity of the manufactured magnesium diboride material is good, it can be used without cooling by liquid helium. [0003] In the prior art, a manufacturing method of magnesium diboride that can be applied industrially is to manufacture a mixture of elemental magnesium and elemental boron, and then undergo a furnace process at a temperature of 800°C-1200°C under the condition of argon as a protective gas. The reaction is strongly exothermic. This method h...

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Problems solved by technology

However, its disadvantage is that the mechanical alloying is very slow, and impurities in the material, for example, increase through wear

After the furnace process, the powder must nonetheless be ground, because although the powder is produced with finer particles than the first conventional method, it always contains a significant portion of overcoarse particles

Second product grinding again increases the fraction of impurities in the powder, is time consuming and limits throughput