Fisher, S.J., Al-Mosawi, M.K., Beduz, C. and Yang, Y.
The effect of core density on the formation of the 2223 phase in (Pb/Bi)2Sr2Ca2Cu3Ox superconducting tapes
Cryogenics, 37, (10), . (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.
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