A kind of preparation method of high-strength mgb2 wire rod

Abstract

The invention discloses a high-strength MgB2 wire manufacturing method. The method includes: 1, manufacturing primary composite wires; 2 assembling secondary composite tubes; 3, drawing the secondary composite tubes for three times at 20%-25% pass processing rate, and then drawing at 10%-15% pass processing rate to obtain wires with required dimensions; 4, performing phase-formation heat treatment on the wires under the protection of argon atmosphere to obtain high-strength MgB2 wires with strength between 220MPa-280MPa. According to the method, CuAg alloy bars are used as reinforcement cores, manufactured multi-core super-conducting wires are transformed evenly, and inner parts are combined tightly, so that the manufactured multi-core super-conducting wires have good plasticity. According to the method, flow of powder in the drawing process is smooth. The method is particularly suitable for processing of MgB two-kilometer long wires and can meet requirements for practical application of super-conducting magnets, especially super-conducting nuclear magnetic resonance spectrometer and the like.

Description

technical field [0001] The invention belongs to the technical field of superconducting material processing engineering, and in particular relates to a high-strength MgB 2 Method of wire preparation. Background technique [0002] MgB 2 Its critical transition temperature is 39k, which has a higher superconducting transition temperature in metal compounds, and can work in the liquid hydrogen temperature region (10-20k), while traditional low-temperature superconductors cannot be applied in this temperature region, and expensive superconductors must be used Liquid helium, which increases the application cost. Through years of research, it has been found that MgB 2 Wires and strips can be prepared in different ways, such as in-situ PIT and ex-situ PIT technologies, both of which can produce kilometer-level long wires. In 2007, ASG, Columbus, and Paramed jointly developed the open MgB used in the temperature zone of the refrigerator. 2 - MRI superconducting magnets, which us...

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Problems solved by technology

In previous studies, it was found that the wire and strip materials with multi-core structure (7, 19, 37 cores, etc.) cannot be processed very well during the drawing process due to the large difference between the plasticity of the central reinforcing core CuNb and the plasticity of the copper stabilization layer. Good synchronous extension causes excessive stress in the center of the wire, and finally makes the deformation thickness of the superconducting core near the central reinforcing core and near the outer sheath matrix material Cu different, and it is easy to draw to a small size (<2.0mm). broken core

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