Iron-based superconductor preparation method based on cold isostatic pressing and directional solidification technology

Abstract

The invention provides an iron-based superconductor preparation method based on a cold isostatic pressing and directional solidification technology, and belongs to the field of material preparation. The main preparation process of the preparation method comprises the steps of 1, proportioning: mixing raw materials proportionally; 2, ball-milling: ball-milling the mixed raw materials in vacuum or protective atmosphere to form uniformly mixed powder; 3, sealing of a silicon case: filling the uniformly mixed powder into the silicon case in the vacuum or protective atmosphere and sealing the silicon case; 4, cold isostatic pressing: putting the silicon case filled with the powder into cold isostatic pressing equipment, and pressurizing and pressing the silicon case into a high-density formingblank; and 5, directional solidification: directionally solidifying the blank formed by pressing, and finally obtaining an iron-based superconducting bar with high performance. The iron-based superconducting material preparation method disclosed by the invention is simple in technology and high in controllability, and iron-based superconducting materials with large size, and high density and orientation can be prepared. The prepared iron-based superconducting materials are excellent in performance, and specially have the feature of high critical current density.

Description

technical field [0001] The invention provides a method for preparing an iron-based superconducting material based on cold isostatic pressing and directional solidification technology, belonging to the field of material preparation. Background technique [0002] As an important class of functional materials, superconducting materials are widely used in many fields such as electric power, computer, transportation, nuclear energy utilization and daily life. Since their discovery, superconducting materials have been a research hotspot in the scientific community. Among the many known superconducting material systems, iron-based superconducting materials, as an emerging high-temperature superconducting material, have attracted widespread attention from scientists and engineers due to their high superconducting critical transition temperature and high critical current density. [0003] At present, the preparation methods of iron-based superconducting materials mainly include powde...

AI Technical Summary

Problems solved by technology

There are many holes in the wire and strip prepared by the powder tube method, resulting in low density. The first reason for these holes is that the powder density itself is not high enough during the powder tube rolling process.

The second is that during the powder sintering process, due to the presence of residual air in the sample or the volatilization of volatile elements in the sample during high-temperature sintering, it causes

Experimental studies have proved that the current consumption is very obvious in the crack and impurity phase area, because the existence of many cracks and FeAs amorphous impurity phase leads to extremely poor connectivity of grains, which is also an important factor for the sharp drop in critical current density