2005, 2001, English, Thesis edition: Microstructural Development and Superconducting Parameters of the YBa2Cu3O7-delta Coated Conductor Rutter, Noel

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Physical Description
  • 258 bytes, 113022 bytes, 105729 bytes, 1219446 bytes, 1408989 bytes, 3268408 bytes, 4680211 bytes, 839457 bytes, 943727 bytes, 1113863 bytes, 134724 bytes, 463350 bytes, 164543 bytes, 65986 bytes, text/​plain, application/​pdf
  • Thesis
Published
  • 2005-06-10T13:37:57Z
  • 2001
Language
  • English

Edition details

Title
  • Microstructural Development and Superconducting Parameters of the YBa2Cu3O7-delta Coated Conductor
Author
  • Rutter, Noel
Published
  • 2005-06-10T13:37:57Z
  • 2001
Physical Description
  • 258 bytes, 113022 bytes, 105729 bytes, 1219446 bytes, 1408989 bytes, 3268408 bytes, 4680211 bytes, 839457 bytes, 943727 bytes, 1113863 bytes, 134724 bytes, 463350 bytes, 164543 bytes, 65986 bytes, text/​plain, application/​pdf
  • Thesis
Subjects
Notes
  • A coated conductor is generally fabricated by depositing a high Tc superconducting layer ontoa flexible metallic substrate, using intermediate buffer layers to prevent chemical interaction.In order for the superconductor to be capable of carrying a high current density, its grainsmust have good crystallographic alignment in order to avoid the presence of high angle grainboundaries. This can be ensured by transferring the texture from the substrate throughepitaxial film growth.The main substrate considered in this thesis is a Ni-Fe alloy. When cold-rolled, NiFedevelops a preferential orientation and upon annealing at an elevated temperature, undergoesprimary recrystallisation to form grains with the cube texture {100}<001>. Therecrystallisation process and the texture of the tapes has been examined and various bufferlayers have been fabricated. As silver does not react adversely with high temperaturesuperconductors, it has been deposited onto Pd-buffered NiFe by DC sputtering and verysharp cube texture is obtained. Ceramic buffer layers, CeO2 and YSZ, have been depositedby RF sputtering, though an undesirable (111) oriented component accompanies the cubetextured material. Also a technique has been developed to produce a suitably oriented nativeoxide of NiFe by a simple oxidation technique. Preliminary attempts to deposit YBCO filmsonto these buffer layers have shown that the quality of the metallic buffers is degraded byrapid inter-diffusion at elevated temperatures, but that cube textured material can bedeposited on the oxide buffer layers.The percolative nature of current flow in such coated conductors has been considered throughthe development of a grain network model. As the texture of the superconducting layer isdirectly influenced by the underlying layers, measurements from the substrate and bufferlayers are applied in order to model the orientations of the grains in a superconductingoverlayer. The model calculates the critical current of coated conductors as a function ofparameters such as length, width, grain size and texture, as well as examining factors such ascracks and highly misoriented grains.
  • EPSRC
  • Materials Science and Metallurgy, University of Cambridge 2001
Language
  • English
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