Welding two intermetallic superconductor parts made of magnesium diboride useful in superconductive magnet of device for e.g. shielding a magnetic field in a specified region of space, comprises heating the parts in oxygen-free atmosphere

摘要

The method comprises: supplying two intermetallic superconductor parts (10, 20) of magnesium diboride type; providing a mold (30) in the two superconductor parts so that geometrically complementary surfaces of the parts contact each other; heating the two superconductor parts in an oxygen-free atmosphere so as to achieve an uniform temperature in the vicinity of geometrically complementary surfaces of the parts; and assembling the two superconductor parts by maintaining the temperature and simultaneously applying a pressure and pulsated or direct current of great intensity. The method comprises: supplying two intermetallic superconductor parts (10, 20) of magnesium diboride type, where each part includes a surface geometrically complementary to the other surface; providing a mold (30) in the two superconductor parts so that the geometrically complementary surfaces of the parts contact each other; heating the two superconductor parts in an oxygen-free atmosphere at a temperature of 900-1500[deg] C so as to achieve an uniform temperature in the vicinity of geometrically complementary surfaces of the parts; assembling the two superconductor parts by maintaining the temperature and simultaneously applying a pressure (P) of 50-200 MPa and pulsated or direct current of great intensity for a period of = 10 seconds; and cooling and extracting the mold of the two assembled superconductor parts. An average quadratic value of the intensity of the pulsated or direct current is 1-2.5 kA. An average quadratic value of the tension applied to obtain the pulsated or direct current is 4-6 V. The supplying step is preceded by a step of shaping the intermetallic superconductor parts by faceting and/or polishing the parts. An independent claim is included for intermetallic superconductor parts of magnesium diboride type.