Precursor preparation by a modified oxalate coprecipitation and its suitability for manufacturing Bi(Pb)SrCaCuO-conductors
- Hoechst AG, Frankfurt/Main (Germany). Corporate Research II
- American Superconductor Corp., Westborough, MA (United States)
Two of the most promising methods for the preparation of conductors for energy applications of HTSC are the ``Powder-in-tube-method`` and the Doctor-Blade process using Ag as substrate material. The authors compared the suitability of precalcined B(PSCCO) precursor powders made by different routes, especially by a modified coprecipitation of oxalates. The material was tested in wire-form and as coated Ag-substrates. Phase purity, stoichiometry, homogeneity, reactivity, C-content and particle sizes were investigated by XRD, SEM, EDX, ICP-AES, AC-susceptibility and particle-size measurements. The precursor powders prepared by the modified coprecipitation exhibit improved properties in comparison to conventional routes. For ``Powder-in-tube`` tapes the precursor could be converted in monofilamentary samples in less than 100h with only one intermediate pressing step to j{sub c}-values up to 1. 5 * 10{sup 4} A/cm{sup 2} (0T/77K) at this time. In the case of the Doctor Blade-process large surfaces could be homogeneously coated with a thickness of 15 {mu}m and reacted to dense and highly textured microstructure. Optimized j{sub c}-values are up to 1.0 * 101 A/cm{sup 2} (0T/77K).
- OSTI ID:
- 43016
- Report Number(s):
- CONF-9310224--; ISBN 0-87339-271-X
- Country of Publication:
- United States
- Language:
- English
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