The effect of core density on the formation of the 2223 phase in (Pb/Bi)2Sr2Ca2Cu3Ox superconducting tapes
Fisher, S.J., Al-Mosawi, M.K., Beduz, C. and Yang, Y. (1997) The effect of core density on the formation of the 2223 phase in (Pb/Bi)2Sr2Ca2Cu3Ox superconducting tapes. Cryogenics, 37, (10), 593-596. (doi:10.1016/S0011-2275(97)00051-9).
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The effect of core density on the processing of superconducting tapes has been investigated. Tapes were prepared with different ‘as-rolled’ densities, but all other mechanical and thermal parameters remained the same. The precursor powder used had a nominal stoichiometry of Bi1.84Pb0.34Sr1.34Ca2.03Cu3.06Ox, doped with 15% Ag by weight prepared by Merck Ltd. The ‘as-rolled’ tapes had Vickers' microhardness numbers, Hv, of 90 and 180 kg mm−2. The local 2223 phase formation across the thickness of the core was studied in tapes of these core densities by sintering them at 818 °C for various times in an atmosphere of 7.5% O2. XRD analysis revealed that low density tapes formed the 2223 phase considerably faster than high density tapes. For example, after 10 h of sintering, the low and high density tapes had a 45% and 3% 2223 phase content at the centre of the core, respectively.
|Digital Object Identifier (DOI):||doi:10.1016/S0011-2275(97)00051-9|
|Additional Information:||Paper presented at Low Temperature Engineering and Cryogenics Conference 1996|
|Keywords:||Bi-2223, core density, incubation period, formation rate, grain size, heating rate|
|Subjects:||T Technology > TK Electrical engineering. Electronics Nuclear engineering
Q Science > QC Physics
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences
|Date Deposited:||17 Nov 2006|
|Last Modified:||06 Aug 2015 02:20|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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