液相烧结YBCO超导体材料的研究

Studies on Liquid phase Sintered Superconductor YBCO

将 YBCO 固相烧结坯料在高于1050℃温度下进行液相烧结,再在123相形成区域内缓冷,定向凝固,最后进行氧化处理。微观组织不同于传统的固相烧结样品,成分均匀的大尺寸的片状晶择优取向生长并以层状分布,定向生长的 YBCO 体材经氧化处理后孪晶密度明显提高,观察出大量的位错线。其性能在0场下大幅度提高。在77K、OT 下 J_c 大于2×10~4A/cm^2。在磁场下,下降幅度明显减少,H=1T,J_c≥6600A/cm^2;H=2T,J_c≥5800A/cm^2;H=5T,J_c≥3600A/cm^2。

The process,structure and properties of high temperature superconductor YBCD prepared by liquid phase sintering and directional solidification were reported. When YBCO solid phase crude materials were liquid phase sintered in 1050℃,coo- led at 123-phase formation area,directio- nal solidified and oxidation treated,the structure is different from that by tradi- tional solid phase sintering.In the former, homogeneous sheet-shaped crystals of large sizes grow at preferred orientation,the twin and dislocation density are high.The properties are also improved rapidly.