An investigation of thermo-mechanical processing parameters of (pb/bi)2sr2ca2cu3ox superconducting tapes
An investigation of thermo-mechanical processing parameters of (pb/bi)2sr2ca2cu3ox superconducting tapes
(Pb/Bi)2Sr2Ca2Cu3Ox silver-sheathed superconducting tapes show much promise for use in many applications. This has resulted in a large amount of research being directed towards improving the current carrying abilities of these tapes. In order to improve the tapes, more information about the effects of the large number of processing parameters on critical current must be known.
This thesis details an investigation into some of these parameters. Both monocore and multifilamentary (Pb/Bi)2Sr2Ca2Cu3Ox silver-sheathed superconducting tapes have been prepared and characterised. The conversion from the (Pb/Bi)2Sr2CaCu2Ox to the (Pb/Bi)2Sr2Ca2Cu3Ox phase has been followed using x-ray diffraction. The critical current density and its magnetic field dependence, have been measured. The parameters investigated for monocore tapes included heating rate, silver doping of the superconducting core and carbon impurities in the core. Those investigated for multifilamentary tapes included the number of intermediate rollings, length of sintering time before intermediate rolling, cooling rate and temperature range of cooling.
It was found that the conversion to the (Pb/Bi)2Sr2Ca2Cu3Ox phase does not occur evenly throughout the core of the tapes. There is a gradient in the amount of this phase across the thickness of the core, with (Pb/Bi)2Sr2Ca2Cu3Ox forming first at the silver sheath interface. This gradient is still present in silver-doped samples although the profile in the central part of the core is flatter. On variation of heating rate it was found that conversion occurred faster for a slower rate. The change in the amount of measurable Ca2PbO4 within the core of samples was also followed. Its reduction was found to mirror the rise in the amount of (Pb/Bi)2Sr2Ca2Cu3Ox measured.
University of Southampton
1998
Law, Lorraine Nicola
(1998)
An investigation of thermo-mechanical processing parameters of (pb/bi)2sr2ca2cu3ox superconducting tapes.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
(Pb/Bi)2Sr2Ca2Cu3Ox silver-sheathed superconducting tapes show much promise for use in many applications. This has resulted in a large amount of research being directed towards improving the current carrying abilities of these tapes. In order to improve the tapes, more information about the effects of the large number of processing parameters on critical current must be known.
This thesis details an investigation into some of these parameters. Both monocore and multifilamentary (Pb/Bi)2Sr2Ca2Cu3Ox silver-sheathed superconducting tapes have been prepared and characterised. The conversion from the (Pb/Bi)2Sr2CaCu2Ox to the (Pb/Bi)2Sr2Ca2Cu3Ox phase has been followed using x-ray diffraction. The critical current density and its magnetic field dependence, have been measured. The parameters investigated for monocore tapes included heating rate, silver doping of the superconducting core and carbon impurities in the core. Those investigated for multifilamentary tapes included the number of intermediate rollings, length of sintering time before intermediate rolling, cooling rate and temperature range of cooling.
It was found that the conversion to the (Pb/Bi)2Sr2Ca2Cu3Ox phase does not occur evenly throughout the core of the tapes. There is a gradient in the amount of this phase across the thickness of the core, with (Pb/Bi)2Sr2Ca2Cu3Ox forming first at the silver sheath interface. This gradient is still present in silver-doped samples although the profile in the central part of the core is flatter. On variation of heating rate it was found that conversion occurred faster for a slower rate. The change in the amount of measurable Ca2PbO4 within the core of samples was also followed. Its reduction was found to mirror the rise in the amount of (Pb/Bi)2Sr2Ca2Cu3Ox measured.
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Published date: 1998
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Local EPrints ID: 463627
URI: http://eprints.soton.ac.uk/id/eprint/463627
PURE UUID: cacd1194-750c-4c38-9712-24f69bd9afd3
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Date deposited: 04 Jul 2022 20:54
Last modified: 04 Jul 2022 20:54
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Author:
Lorraine Nicola Law
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