mgb2 superconducting wire and its manufacturing method

Abstract

The utility model discloses a manufacturing method of an MgB2 superconducting wire, comprising the following steps: intensively mixing dry powder of magnesium, boron, hafnium and silicon for 1-3 hours according to an atomic ratio of Mg, Hf, B to Si of 1-x, x, 2-x to x, wherein x is larger than or equal to 0.05 and smaller than or equal to 0.20; loading the mixed powder in a seamless low-silicon steel tube or niobium tube, and then loading the complex in an oxygen-free copper tube to assemble another complex; processing the complex into wire bars at room temperature through the comprehensive use of three technologies of swaging, groove rolling and drawing; placing the wire bars in a vacuum annealing furnace, charging pure argon or gas mixture of argon and hydrogen after vacuumizing till 10 to the power of -3 under room temperature, and then heating till the temperature of 740-760 DEG C at a speed of no less than 60 DEG C per minute and keeping warm for 1-10 hours; and cooling till room temperature at a speed of no less than 25 DEG C per minute so that the MgB2-based superconducting wire with a round cross section is manufactured. The method is simple in preparation process and is suitable for producing and manufacturing the MgB2-based superconducting wire with high critical current density in a background magnetic field of more than 3T in large scale.

Description

technical field

[0001] The invention relates to a superconducting material and a preparation method thereof. Background technique

[0002] Magnesium diboride (MgB 2 ) is the intermetallic compound superconducting material with the highest critical transition temperature at present, and its critical transition temperature (39-40K) is higher than that of Nb which has been practically applied so far. 3 Superconducting materials such as Sn and NbTi. The advantages of high transition temperature, large coherence length, high upper critical field, no weak connection at grain boundary, simple structure and low cost make MgB 2 Become the most powerful competitor for materials used in the 20K-30K temperature range.

[0003] Especially in the field of low field, such as in magnetic resonance imaging magnet applications, MgB 2 showed a great advantage, and data have shown that MgB 2 The practical application will bring billions of economic benefits, and because it can work under t...