Abstract
MgB 2 shows no weak coupling of grains, indicating that grain alignment is not essential to obtain large current transfer from one grain to adjacent grain. This is a very big advantage because a simple process, such as powder-in-tube (PIT) method, can be applied for the fabrication of wires and tapes. Here, we report the recent progress of our MgB 2 tapes and wires. There are two PIT methods. One is an in situ method, in which a powder mixture of Mg and B is used as a starting material. The other is an ex situ method, in which reacted MgB 2 powder is used. Superconducting properties are much sensitive to the quality of the starting powder, the porosity of the MgB 2 core and the heat-treatment conditions. Impurity addition to the mixture of starting powder is an effective method to improve J c of MgB 2 tapes and wires. Among the impurities nano-SiC powder is the most popular additive. SiC addition introduces C substitution for B site in MgB 2 and enhances H c2 , thus leading to the increase of J c in high ...
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