METHOD FOR PRODUCING MAGNESIUM DIBORIDE BASED HIGH-TEMPERATURE SUPERCONDUCTORS

摘要

FIELD: electrical engineering; production of magnesium diboride based high-temperature superconductors. ^ SUBSTANCE: proposed method for producing single-core and multicore superconductors for critical current density includes production of hollow metal ampoule, its filling with powder in the form of mixture of stoichiometric composition incorporating homogeneous granulated magnesium having clean passivated surface obtained by centrifugal spraying of magnesium heated to 650-850 °C from crucible revolving at speed of 1000-6000 rpm, as well as crystallization of sprayed magnesium in helium environment and amorphous boron powder, deformation of ampoule-powder element by extrusion at temperature of 450-500 °C and extrusion coefficient of 3-6, followed by drawing with deformation degree of 5-10% per pass, and heat treatment at 800-900 °C for 1-10 in vacuum or argon environment. ^ EFFECT: improved quality of superconductor core due to higher quality of magnesium powder and especially improved condition of magnesium powder surface. ^ 5 cl