In the present study, Mg diffusion process has been investigated by transport measurements and surface morphology analysis in round MgB₂ wires made with internal Mg diffusion (IMD) method. These wires were produced using semi-amorphous boron, nano-sized amorphous boron or mixtures of them via cold drawing process. In addition to the conventional IMD wire production technique, a thin layer of magnesium was initially coated on the interior of the iron sheath and diffused into the boron powder during sintering. It has been found that Mg coating is effective on improving the engineering current density of IMD wires having relatively thick MgB₂ cores. Surprisingly, Mg coating is also effective in non-stoichiometric hybrid IMD wires containing highly excessive amount of Mg.

在本研究中，已经通过内部Mg扩散（IMD）方法制成的圆形MgB ₂导线中的传输测量和表面形态分析研究了Mg扩散过程。这些线材是使用半非晶态硼，纳米级非晶态硼或它们的混合物通过冷拔工艺生产的。除了常规的IMD焊丝生产技术外，镁的薄层最初还被涂覆在铁皮的内部，并在烧结过程中扩散到硼粉中。已经发现，Mg涂层对于提高具有相对较厚的MgB ₂芯的IMD线的工程电流密度是有效的。出人意料的是，镁涂层在含有过量镁的非化学计量混合IMD导线中也有效。