腐蚀和热处理对YGdBCO带材结构和性能的影响

Effect of chemical corrosion and heat treatment on the structure and properties of YGdBCO superconducting tapes

主要探索化学溶液法沉积超导焊料的生长过程,研究涂层溶液对YGdBCO带材超导层的腐蚀性以及在三个低温热处理阶段带材c轴织构和临界电流的变化,优化出了可制得与母材性能相近的涂层溶液合成技术和低温热处理工艺。在此基础上,在790℃高温成相过程中生长出具有c轴织构的YBCO薄膜,有助于解决母带超导层表面粗糙度较大导致界面原子扩散不均匀而产生的接头连接性较弱的问题。

In this work, the growth process of superconducting solder deposited on superconducting layer of YGdBCO superconducting strip was explored by chemical solution deposition approach. The corrosion of coating solution to superconducting layer was investigated and the change of c-axis texture as well as critical current of YGdBCO tapes were analyzed in three stages of low temperature heat treatment. The optimal synthesis route of coating solution and low temperature heat treatment technology were achieved, which could prepare coated samples with comparable properties to original tape. On this basis, YBCO films with c-axis texture were grown in the process of high temperature phase formation at 790 ℃, which is helpful to solve the weak connection problem caused by uneven atom diffusion at joining interface, due to large surface roughness of original superconducting layer.