BI-SR-CA-CU-O SUPERCONDUCTING THICK-FILMS DEPOSITED ONTO METALLIC SUBSTRATES BY PLASMA SPRAYING

Bi2Sr2Ca1Cu2Ox thick layers were produced by Vacuum Plasma Spray (VPS) on Ni and stainless steel substrates with Yttria stabilized Zirconia as diffusion barrier and a metallic bond layer. After spraying the sam ples were melt-textured in a gradient furnace at temperatures ranging from 890-degrees-C to 950-degrees-C. The furnace was moved across the samples with velocities that varied from 10 to 3000 mm/h. X-ray diffra ction data show that the thick films are c-axis oriented and contain p rimarily the 2212 phase. The onset of superconductivity is around 90 K for all the measured samples while zero resistance is achieved over a broad temperature range. The relation between the degree of texturing and the resistance will be discussed.