单畴GdBCO超导块材制备方法的改进及超导特性研究

通过改变液相源成分和先驱块的装配方式对顶部籽晶熔渗生长方法(TSIG)进行改进,并用新方法成功制备了单畴Gd-Ba-Cu-O(GdBCO)超导块材.对样品形貌和微观结构的研究发现,应用新方法制备的样品呈现出良好的织构度,其内俘获的Gd₂BaCuO₅(Gd-211)内含物分布均匀且粒度较小.超导性能的测试表明,样品具有较高的超导转变温度和自场临界电流密度,表现出较大的磁悬浮力.此外,应用新方法可以简化实验步骤,缩短制备周期,提高实验的稳定性,从而降低了实验难度,为大尺寸单畴块材的批量化制备打下了基础.关键词：GdBCO熔渗生长液相源装配方式

Fabrication method improvement and superconducting property investigation of single domain GdBCO bulk superconductors

Top seeded infiltration and growth method (TSIG) is improved by adopting a new liquid source and novel configuration. And single-domain Gd-Ba-Cu-O (GdBCO) bulk superconductors are successfully prepared using the improved method. Experimental observations on the morphology and the microstructure show that the samples exhibit good texture and homogeneous distribution of fine Gd₂BaCuO₅ (Gd-211) inclusions. Superconductive measurements reveal that the sample exhibits high superconducting transition temperature, self-field critical current density, and strong levitation force. In addition, the improved method can be used to simplify the process flow, shorten the experimental cycle, and enkhance the stability of the process, thus reducing the experimental difficulties. The results lay a good foundation for the enhance production of large single domain bulks.