Effects of colloidal and deformation processing on the properties of silver-clad bismuth strontium calcium copper oxide tubes
Abstract
Although much research has been performed on BSCCO, significant potential exists for improving current transport and magnetic properties through microstructure control. In this study, an investigation of the coupling between quantitative microstructure studies and fundamental properties measurements provides a better understanding of the complex behavior of these anisotropic polycrystalline materials. Textured Ag-clad BSCCO-2223, (Bi,Pb)$\rm\sb2Sr\sb2Ca\sb2Cu\sb3O\sb{x},$ tubes have been produced by a centrifugal slip casting process, with additional investigation of subsequent mechanical deformation effects on component microstructure and performance. Comparison of centrifugally slip cast tube microstructures and subsequently mechanically consolidated tube microstructures reveals interactions among grain growth, texturing, and densification, and their corresponding effect on superconducting properties. Spatially resolved magnetic shielding measurements quantify shielding and trapping of magnetic fields, providing a unique means of quantifying bulk critical current density. The effects of microstructures and intentionally induced macroscopic defects on shielding performance are also discussed.
Degree
Ph.D.
Advisors
Trumble, Purdue University.
Subject Area
Materials science
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