Method for preparing six-core MgB2 superconducting wire by magnesium diffusion method

Abstract

The invention discloses a method for preparing a six-core MgB2 superconducting wire by a magnesium diffusion method. The preparing method comprises the steps that first, a niobium strip coil is manufactured to be a niobium tube, amorphous boron and SiC mixed powder are filled into the niobium tube with a metal magnesium rod being used as a centering rod, and continuous groove rolling is conducted to obtain single-core wires; second, a Cu-Nb composite rod and the single-core wires are placed in an oxygen-free Cu tube to be assembled to obtain a secondary composite body, and the six-core wire is manufactured by route processing through the technology with drawing and rolling combined; third, the two ends of the six-core wire are sealed to be protected and then are coiled, and then the six-core wire is placed on a stainless steel plate, phase heat processing is conducted in an annealing furnace, and the six-core MgB2 superconducting wire through magnesium diffusion is obtained. The core wire of the wire prepared by the method is higher in compactness, meanwhile, uneven tubulating caused by human factors is avoided, the tubulating process is suitable for full-automatic mechanical operation, mass production is facilitated while the evenness of tubulated powder is guaranteed, and therefore the production efficiency of the wire is greatly improved.

Description

Technical field [0001] The present invention belongs to the field of superconducting material processing engineering technology, which involves a 6 -core MGB 2 Preparation method of superconducting wire material. Background technique [0002] MGB 2 Due to the high critical temperature (TC = 39K), large coherent length, and no weak connection of the crystal world due to its critical temperature (TC = 39K), the preparation of its line belt materials has always been the focus of research in various research groups at home and abroad, and the choice of packaging materials is the choice of packaging materials.For the problem that prepare high -performance wire bands is a problem that must be solved, the package materials must be able to withstand certain strength and bending, and have superior thermal stability and low cost. At the same time, it is necessary to avoid chemical reactions with the original powder., To ensure that high critical current density is obtained. [0003] Curren...

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Problems solved by technology

Although people in the multi-core MgB 2 Great achievements have been made in the preparation of wire strips, but they are still in the experimental stage in the laboratory, and the equipment requirements are high and the process is complicated, so they cannot be used for industrial production and meet the needs of practical applications.

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