Influence of chemical etching and heat-treatment on the structure and superconducting properties of YGdBCO coated conductors

29th International Symposium on Superconductivity

Wang, M.J.^1 ; Wang, W.T.^1 ; Liu, L.^1 ; Huo, B.L.^1 ; Yang, X.^1 ; Cheng, C.H.^2 ; Zhao, Y.^1,2

Key Lab of Magnetic Levitation Technologies and Maglev Trains(Ministry of Education of China), Key Laboratory of Advanced Technologies of Materials (Ministry of Education of China), Superconductivity and New Energy RandD Center, Mail Stop 165, Southwest Jiaotong University, Chengdu, Sichuan

610031, China^1

School of Materials Science and Engineering, University of New South Wales, Sydney

NSW

2052, Australia^2

关键词: Alcohol solutions;    Coated conductors;    Etching temperature;    Heat treatment process;    Lower temperatures;    Peritectic reaction;    Superconducting joints;    Superconducting properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/871/1/012041/pdf
DOI  :  10.1088/1742-6596/871/1/012041

来源: IOP

【 摘 要 】

The effects of chemical etching (to remove metal stabilizer layers) and novel heat treatment process on the structure and superconducting properties of YGdBCO CCs for preparing a superconducting joint were studied. After removing the Cu stabilizer layer with the FeCl3alcohol solution, the mixture of NH3.H2O and H2O2was used to remove Ag stabilizer layer with various conditions such as etching temperature and time. Due to the decomposition of YGdBCO at high temperature, few secondary phases such as YGd211 and BaCuO2were detected after partial melting. It is interested to note that these secondary phases were not detected after recrystallization at a relatively lower temperature. According to the pseudo-binary phase diagrams of Lee [1], the peritectic reaction of YGd211 was occurred and the YGd123 particle was aligned again along c-axis. Additionally, the oxygenation annealing process was indispensable to restore the degraded superconducting properties of YGdBCO CCs caused by the oxygen diffusion out of itself during heat treatment process. The above results were favorable to prepare the superconducting joint of YGdBCO CCs in our future work.