Development of a Composite Tape Conductor of Y-Ba-Cu-O
Samples of a “prototype” composite tape conductor have been successfully prepared consisting of a thick layer of Y Ba2Cu3O7 (123) on a Ni substrate. Thick continuous layers of 123 were applied to a Ni substrate by multiple applications using an aerosol technique. Sintered composite samples were prepared at 910°C and equilibrated in oxygen at 450°C. These samples demonstrated promising mechanical properties with good adhesion to the substrate, tolerance to thermal cycling and ability to withstand nominal bending deformation without any detrimental influence, i.e., cracking of the superconductor. The superconducting properties showed 123 orthorhombic formation with Tc onset of approximately 92K. Processing approaches to improve the current density are currently under investigation, including the use of a buffer layer to inhibit Ni diffusion and melt-texturing as a means for increasing bulk transport currents. Preliminary melt processing results show evidence for texturing and current density near 103 A/cm2. Similar values for the critical current were also obtained for vapor deposited “polycrystalline” 123 films on MgO/Ni substrates.
KeywordsBuffer Layer Superconducting Property Thermal Expansion Property Composite Tape Liquid Phase Migration
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