Process for producing molded bodies from precursors of high-temperature superconductors

摘要

To produce more complex molded bodies from precursors of high-temperature superconductors based on the oxides of bismuth, strontium, calcium and copper, the homogeneous melt of these oxides is cast in molds at temperatures of 870 DEG to 1000 DEG C. In this process, the geometrically appropriately shaped molds are composed of a material having a melting point of at least 1000 DEG C. Finally, the molds containing solidified melt of the oxides of bismuth, strontium, calcium and copper are treated with dilute hydrofluoric acid at temperatures of 20 DEG to 90 DEG C. until the molds are dissolved.