Direct deposition of c-axis textured MBCO thick film on unoriented metallic substrate for the development of long superconducting tapes
Direct peritectic growth (DPG) is a novel process in which textured YBCO thick films are deposited directly onto an unoriented silver alloy. No buffer layer is employed between the YBCO superconducting film and the silver alloy substrate. The textured YBCO grains have been obtained through peritectic solidification over a wide range of temperature and time. No observable reaction of the substrate was found with the YBCO melt at the maximum processing temperatures near the peritectic point (from 950/spl deg/C to 1030/spl deg/C). The transport J/sub c/ has reached a respectable value of 8/spl times/10/sup 4/ A/cm/sup 2/ at 77 K and in zero magnetic field. In this paper, we show that the DPG method is capable of producing highly textured YBCO thick films, which are scalable to long lengths with low cost.