Preparation method of magnesium diboride superconducting thin film used for superconducting cables

Abstract

The invention discloses a preparation method of magnesium diboride superconducting thin film used for superconducting cables. The preparation method comprises following steps: a substrate is selected,washed, and is introduced into a deposition chamber; the deposition chamber is vacuumized, the substrate is heated, a mixed gas of argon and hydrogen is introduced into the deposition chamber, diborane is introduced into the deposition chamber, the substrate is heated to a temperature higher than 400 DEG C so as to realize deposition of elementary B onto the substrate and generation of an amorphous B film; the amorphous B film is cooled to room temperature, the amorphous B film and high purity magnesium particles are introduced into a sealed crucible; annealing is carried out in high purity argon for 10min, wherein in the annealing process, the temperature is increased to 800 to 1000 DEG C at a temperature increasing speed of 20 DEG C / min, thermal insulation treatment is carried out for 30 to 40min, natural cooling to room temperature is carried out. The MgB2 superconductor prepared through the preparation method is high in density and purity; the steps are simple; operation is convenient; cost is low; no environment pollution is caused; and the practical value is high.

Description

technical field [0001] The present invention relates to a kind of MgB 2 A method for preparing a base superconducting thin film, the superconducting thin film is used to manufacture superconducting cables, has excellent superconducting characteristics, such as exhibiting high critical current density, etc., and is easy to manufacture. Background technique [0002] Metal-based superconductor materials such as NbTi and Nb 3 Sn is currently the most common material used for superconducting wires used in high-field magnets and the like. However, because these materials have very low critical temperatures, their use is limited to the temperature range of liquid helium. In terms of quenching, MgB 2 is favorable because its critical temperature T c Higher, at 39K, and usable temperatures are expected to reach 20K, which is higher than what can be achieved with conventional intermetallic superconductors. However, in order to obtain a material exhibiting a high critical current ...

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Problems solved by technology

However, in order to obtain a material exhibiting a high critical current density, the material must be synthesized in a high-pressure atmosphere (eg, 40,000-60,000 atm), and therefore, it has little prospect for use as a superconducting material, which is currently Requires low-cost mass production

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