Tape processing of HBCCO, BSCCO, and YBCO thick films on metallic substrates with high J C by the spray/compress technique

Abstract

A simple spray/compress technique has been developed for the fabrication of thick film tapes of HBCCO, BSCCO, and YBCO on metallic substrates with high J C. The technique has successfully incorporated crucial processing factors to achieve composition uniformity, phase purity, preferred microstructure, grain alignment, and high density for high temperature superconducting tapes of high performance. We have obtained a J C of 8.8×10 4 A/cm 2 in YBa 2Cu 3O 6+δ thick films on Ag/Pd substrates at 77K and self-field; 7×10 4 A/cm 2 in HgBa 2Ca 2Cu 3O 8+δ thick films on Ni substrates with a buffer layer at 77K and self-field; and 5×10 5 A/cm 2 and 3×10 5 A/cm 2 in Bi 2Sr 2CaCu 2O x thick films on Ni substrates with a buffer layer at 4.2K in self-field and 8T, respectively.