In order to realize practical superconducting joints between Bi2223 tapes towards persistent-current magnets, Bi2223 thick films with high critical current density (J_c) suitable for joint intermediate layers are needed. On the other hand, the methodology of c-axis grain alignment for improving the critical current properties in the polycrystalline materials with a relatively large thickness has not been established. Although the magnetic grain alignment technique is known to be effective for Bi2223 materials, there have not been any successful studies achieving high intergrain J_c of Bi2223 polycrystalline materials prepared thorough the magneto-scientific method thus far. In the present study, fabrication and evaluation of the physical properties of the c-axis-aligned thick films obtained through grain alignment technique using a permanent magnet were performed. Improvement of the intergrain J_c according to the magnetic grain alignment was confirmed in the thick film samples. Control of the microstructure demonstrated in the present study is one of the promising way for realization of the practical superconducting joints between the Bi2223 commercial tapes.

为了在Bi2223胶带之间实现朝向永久电流磁体的实用超导接头，需要具有适用于接头中间层的高临界电流密度（J _c）的Bi2223厚膜。另一方面，尚未建立用于改善厚度较大的多晶材料中的临界电流特性的c轴晶粒取向的方法。尽管已知磁性晶粒对准技术对Bi2223材料有效，但尚未有任何成功的研究实现高晶界J _{c的研究。}迄今为止，已经通过磁科学方法制备了Bi2223多晶材料。在本研究中，进行了通过使用永磁体的晶粒取向技术获得的c轴取向厚膜的物理性能的制备和评价。在厚膜样品中证实了根据磁晶粒取向的晶间J _c的改善。在本研究中证明的微观结构控制是实现Bi2223商业胶带之间实用的超导接头的有前途的方法之一。