A Coated Infiltration Growth Technique for Fabricating Single-Grain Y-Ba-Cu-O Bulk Superconductor

摘要

A coated infiltration growth technique was proposed to fabricate single-grain Y-Ba-Cu-O bulk superconductor, in which a liquid source coated Y_2BaCuO_5 (Y-211) preform was employed and the liquid source composition was 3BaO + 5CuO. Experimental results indicated that, the sample exhibited a single-grain morphology on the top surface, and the liquid source coating always existed surrounding the bulk which contributed to the complete growth of the sample. The homogeneous distribution of fine Y-211 inclusions in microstructure and a satisfactory J_c performance of 5.67 × 10~4 A/cm~2 in self-field at 77 K have also been observed.