Connecting method of MgB* superconduction in strip shape

Abstract

The invention provides a superconducting connection method for MgB2 strips. The connection method is characterized in that: a small amount of mixture of Mg powder and B powder is put between two MgB2 strips to be connected; heat treatment is carried out to ensure that molten Mg infiltrates an MgB2 superconducting core of the part to be connected; meanwhile, the molten Mg reacts with B to form MgB2 during the heat treatment; finally, the MgB2 is cooled and then connected with the MgB2 superconducting core. The resistance of a joint part in the invention is below 10 <-11>; the maximum critical current of the joint can reach about 389 A, which is converted into the critical current density of 6.94x10<4>A / cm<2> and is equivalent to the critical current density (about 7x10<4>A / cm<2>) of a complete short sample of the strips in the same batch under the same conditions.

Description

technical field [0001] The present invention relates to a kind of MgB 2 Strip superconducting connection method. Background technique [0002] MgB 2 It is a new type of superconducting material discovered in 2001 and has wide application prospects. At present, there are MgB which can be supplied in small batches at home and abroad. 2 Strip. In order to further simplify the production process and make more efficient use of MgB in fields such as magnets and superconducting power transmission 2 Strip materials, such as realizing closed operation in application devices such as medical nuclear magnetic resonance magnets, reducing joint resistance heat loss caused by normal conduction connections, etc., require superconducting connections for superconducting strips. Traditional alloy superconducting materials such as NbTi and other superconducting materials represented by plastic alloys can directly realize superconducting connection by welding or pressing, while MgB 2 It has...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the existing superconducting strip connection technology in the high reaction temperature, the inability to properly ensure the mechanical strength of the joint, the density of the superconducting core, and the inability to connect the easy-to-oxidize superconducting core. According to Mg, B and MgB 2 Physicochemical properties of superconductors and commonly used MgB such as Fe 2 The properties of superconducting tape sheathing materials provide a way to realize the MgB 2 Method for Reliable Superconducting Connection of Superconducting Strips

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