Effects of textured micro-structure on the critical current anisotropy of MgB2 superconductor tapes

MgB_2超导体被认为是一种很有前途的超导磁体材料。本研究从临界电流各向异性的角度出发，研究了非原位粉末法制备的MgB_2带材的临界电流各向异性与微观结构之间的关系，为改善其临界电流性能提供了线索。对于不同取向关系的磁带和外加磁场，硬质护套材料通过对磁带芯的辊感毛化提高了强磁场中的临界电流。此外，还报道了用注浆法制备织构粉末的结果。

The MgB2 superconductor has been regarded as a promising material for superconducting magnet uses. In this study, we investigated the correlation between the critical current anisotropy and the microstructure of the ex situ powder-in-tube processed MgB2 tapes for obtaining a clue to some improvements in the critical current properties from the viewpoint of making use of the critical current anisotropy. The hard sheath material enhanced the critical current in high magnetic fields through the roll-induced texturing of the tape core, with respect to different orientation relations between the tape and the applied field. Additionally, results of using the slip casting method for fabricating textured powders are reported.