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Studies To Prepare Superconducting Thick Films On Aluminium Oxide And Zirconium Oxide Substrates

Thick film pastes were manufactured from YBa2Cu3O7-8 superconducting powders prepared by the mixed oxide route. Thick films were printed onto A1203 and stabilized ZrO2 substrates. Experimentally determined one or two step profiles in the range of 750 to 1000°C in oxygen or air were used to fire the pastes. The two step profile gave better results as the formation of adverse phases was hindered and the adhesion to the substrate was better. X-ray studies revealed that the top layer of the films on A1203 contained ca 90% of YBa2Cu307_8 phase and a minor amount mainly of the Y2BaCuO5 phase. SEM micrographs showed liquid phase sintering to have occurred on A1203 substrates but not on the ZrO2 substrates. SEM micrographs of the cross-section revealed BaAl2O4-phase at the A1203/thick film interface and some CuO and Y2BaCuO5 phases outside of it in addition to the major superconductive YBa2Cu307_5 phase. On ZrO2, the top layer of the films also contained 80 to 90% of YBa2Cu307_δ phase and, when short firing was used, minor amounts of Y2BaCuO5 and Y2Cu2O5. On longer firing the minor phase was Y2BaCuO5. Resistance measurements of films on both substrate materials showed the transition onset above 85 K.