The effect of core density on the formation of the 2223 phase in (Pb/Bi)2Sr2Ca2Cu3Ox superconducting tapes

✍ Scribed by S.J. Fisher; M.K. Al-Mosawi; C. Beduz; Y. Yang

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 404 KB
• Volume: 37
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/s0011-2275(97)00051-9

✦ Synopsis

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 Bi,.,,Pb,.,,Sr,.,,Ca~.~~Cu3.060xr doped with 15% Ag by weight prepared by Merck Ltd. The 'as-rolled' tapes had Vickers' microhardness numbers, H,, of 90 and 180 kg mm-*. 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% 0,. 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.