Connecting method of MgB* superconduction in strip shape

A connection method and superconducting technology, applied in the direction of connecting contact materials, etc., can solve the problems of inability to properly guarantee the mechanical strength of the joint, high reaction temperature, and inability to connect easily oxidized superconducting cores, etc., so as to improve the critical current characteristics and reduce the joints. resistance, the effect of reducing the influence of the external atmosphere

Inactive Publication Date: 2011-04-20
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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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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  • Connecting method of MgB* superconduction in strip shape
  • Connecting method of MgB* superconduction in strip shape
  • Connecting method of MgB* superconduction in strip shape

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Embodiment Construction

[0015] first as figure 1 As shown in a, peel off the sheath material with a length of about 5-10 mm on one side of the two sections of strip ends to be connected by mechanical means, exposing a superconducting core with a length of about 10 mm, and the strip after removing the sheath material is shown as figure 2 as shown, figure 2 A is a single-core strip, and b is a multi-core strip. Then if figure 1 As shown in b, two sections of strip superconducting cores with cladding materials removed are relatively attached, and a small amount of Mg, which has been mixed and ground according to the atomic ratio Mg:B=1:2, is added between the contact surfaces of the two sections of superconducting cores. B Mix the powder, the particle size of the added powder is 325 mesh, and keep the two strips to be connected in close contact. Then if figure 1 As shown in c, use a thin Cu sheet to tightly wrap the outer side of the connecting part of the superconducting strip, so that the two st...

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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 involves a MGB 2 Band superconducting connection method. Background technique [0002] MGB 2 It is a new type of superconducting material discovered in 2001. At present, there are already small batches of MGB supplied at home and abroad. 2 Strip.In order to further simplify the production process, MGB is more effective in the fields of magnets and superconducting power transmission 2 Band materials, such as realizing closed operations in applications such as medical nuclear magnetic resonance magnets, reducing thermal loss of connector resistance caused by constant -directed connections, etc., superconducting the superconducting material is needed.Traditional alloy superconducting materials such as NBTI, etc., such as plastic alloys, can directly implement the superconducting connection by melting or pressurizing, and MGB 2 The melting point is high, and it is a crispy ceramic material. It cannot be used to achieve superconducting conn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01R4/68
Inventor 李晓航叶立阳高召顺金明剑杜晓纪张正臣孔令启杨晓乐马衍伟肖立业
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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