用扩散法制备MgB_(2)块材的研究进展

Research Progress in Preparation of MgB_(2) Bulk by Diffusion Method

MgB2超导体具有优良的超导电性能,受到了极大的关注。用不同方法制备的MgB_(2)超导体,其超导电性能也不尽相同。常压扩散法使用的设备简单且操作方便,制备出的MgB_(2)超导电性能也较为优越。本文系统地介绍了属于扩散法的渗透生长法、渗透胶囊法、液相Mg扩散法和气相扩散法并对其优缺点进行了比较,重点介绍了液相Mg扩散法在超导电缆、电磁屏蔽和磁悬浮等方面的应用。根据对各种合成方法的比较及其相关的应用,展望了扩散合成法的发展趋势。

Since the discovery of MgB_(2) superconductor in 2001, it has been highly concerned by scientists and engineers due to its peculiar characteristics. As a result, a number of different methods and approaches had been developed for the synthesis of MgB_(2) superconductor, whilst its performance in superconductivity varies significantly depending on the synthesis method. Among many synthesis methods,the diffusion method is the mostly effective way to synthesize MgB_(2) of superior superconductivity, while such process requires simple equipment and is easy to operate. This article systematically introduced various diffusion methods, including infiltration growth method, infiltration capsule method, liquid phase Mg diffusion method and vapor phase diffusion method, and the advantages and disadvantages of these methods were also compared. At the same time, the main application fields of liquid phase Mg diffusion method, such as superconducting cable, electromagnetic shielding and magnetic levitation, were introduced. Based on the comparison of various synthetic methods and their related applications, the development trend of diffusion synthesis was ulteriorly prospected.