Preparation of modified MgB2 superconducting wire by powder-in-tube method and its properties

• 1、Chemistry and Chemical Engineering School, Chongqing University,Chongqing 400000
• 2、Physical Engineering School, Chongqing University,Chongqing 400000

Abstract：In order to achieve the accuracy of liquid hydrogen measurement, liquid hydrogen level measurement is the main basis for controlling liquid hydrogen filling flow, so the superconducting core is an important guarantee for the accurate measurement technology of liquid hydrogen level. The modified MgB2/Fe superconducting wire was prepared by powder sleeve method, the ball milling technology for preparing precursor powder and the influence of different heat treatment temperatures on the superconducting properties of the wire were studied, and the diffusion behavior of the Fe jacketed material in the superconducting phase was analyzed. The results show that the average particle size of the precursor powder decreases to 269.13nm after 6 h of ball milling under vacuum, and the superconducting transition width decreases first and then increases with the increase of ball milling time. After 800 C heat treatment, the modified MgB2/Fe superconducting wire was obtained, which had obvious superconducting transition, the superconducting transition width was 0.8K, and the thickness of the diffusion layer was in the range of 30~60μm.

Keywords： MgB2 Superconducting wire powder-in-tube method Ball milling process