籽晶定向浸渗生长法制备YBCO块材的微观组织特征研究(英文)

Study on Microstructure Characterization of YBCO Bulk Prepared by Directional Seeded Infiltration-Growth

采用籽晶浸渗生长工艺和定向凝固技术(DSIG)可以制备具有良好取向的单畴YBCO块材。利用Y-211颗粒和液相预制体作为初始材料以浸渗生长工艺可以控制Y-123基体上的Y-211颗粒的尺寸和分布并且可以制备出近终形的块材。讨论了籽晶定向浸渗生长工艺的主要参数(浸渗结构、温度梯度和最高加工温度)。另外,当液相为035时,Y-211颗粒掺杂的尺寸小于其它2种液相成分所得到的Y-211颗粒掺杂尺寸。

The seeded infiltration-growth process is an alternative to replace conventional melt processing techniques for the preparation of bulk YBa2Cu3O7-σ （Y-123） with finely dispersed small size of Y2BaCuO5 （Y-211） particles. The directional solidification is also a quite effective technique to produce well-oriented cylinder grains. Well-oriented Y-123 bulks can be fabricated by combining seeded infiltration-growth and directional solidification technique （DSIG）. The infiltration-growth process is able to control the size and distribution of Y-211 particles in the final Y-123 superconductor and can fabricate net-shape bulk. Y-211 particles and a liquid phase precursor. Were used as starting materials in the present investigation. The main parameters （temperature gradient, configuration and maximum processing temperature） of the directional seeded infiltration-growth process were discussed in the present paper. The result shows that Y-211 particle sizes upon using 035 liquid phase composition are smaller than those upon using other two liquid phase compositions.