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  • grid alloy  (2)
  • Ag/Bi-2223 tape  (1)
  • High-T c superconductor  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Influence of silver on electrochemical and corrosion behaviours of Pb–Ca–Sn–Al grid alloys Part I: Potentiodynamic and potentiostatic studies (1999)
    Springer
    Journal of applied electrochemistry 29 (1999), S. 1-6 
    Details
    ISSN: 1572-8838
    Keywords: lead acid battery ; grid alloy ; silver ; electrochemical behaviour ; corrosion behaviour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The influence of silver, in the range of 0.02 wt% to 0.07 wt%, on the electrochemical and corrosion properties of Pb–Ca–Sn–Al grid alloy in sulphuric acid solutions at room temperature was investigated by potentiodynamic and potentiostatic methods. The introduction of Ag into a common grid alloy of Pb–Ca–Sn–Al confers some important features on the alloy. Potentiodynamic anodic polarisation measurements provided a qualitative overview of the activating, passivating and transpassivating processes which correspond to Pb → PbSO4, PbSO4 → PbO2 reactions respectively. Cyclic voltammetric measurements provided information on the effect of Ag on the oxidation of PbSO4 to PbO2. The addition of Ag refined the grains and enhanced the passivation of the electrode and its corrosion resistance. A decrease in the oxygen evolution overpotential and an increase in the hydrogen evolution overpotential with the additions of Ag were also observed during the experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003492329927
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of silver on electrochemical and corrosion behaviours of Pb–Ca–Sn–Al grid alloys Part II: A.c. impedance and scanning electron microscopy studies (1999)
    Springer
    Journal of applied electrochemistry 29 (1999), S. 177-183 
    Details
    ISSN: 1572-8838
    Keywords: corrosion ; grid alloy ; lead–acid batteries ; silver
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The influence of silver, in the range of 0.02 to 0.07wt%, on the electrochemical and corrosion properties of Pb–Ca–Sn–Al grid alloy in sulphuric acid solutions at room temperature was investigated by electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). EIS was used to study the effect of silver on the surface layer(s) of an electrode under different conditions, while the oxide layers produced on the working electrode surface were examined by SEM. The addition of silver in the alloy inhibits the reactions of Pb to PbSO4 and PbSO4 to PbO2 and produces a more dense oxide layer which could enhance the corrosion resistance of the alloy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003469032404
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Long multifilament Bi-2223 Ag-sheathed superconducting tapes and solenoids (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 829-833 
    Details
    ISSN: 1572-9605
    Keywords: High-T c superconductor ; multifilament tape ; critical bend strain ; superconducting solenoid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Multifilament Ag-sheathed BiPbSrCaCuO (2223) superconducting tapes containing 49 filaments were fabricated by the powder-in-tube route and the roll-anneal process. The transport critical current densityJ c was 1.3×104 A cm−2 at 77 K and 7×104 A cm−2 at 4.2 K in self-field. A 12-m-long tape was used to construct superconducting solenoids (50, 28, and 14 mm internal diameters) generating dc fields 380–1070 G at 4.2 K. Measurements of the variation ofJ c with field (0–1.6 T) and bend strain (0–5%) are used to explain the performance of the solenoids. The critical bend strain of tapes was about 1.5%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01320878
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Intrinsic critical current of Ag-clad (Bi,Pb)2Sr2Ca2Cu3O z tapes (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 809-812 
    Details
    ISSN: 1572-9605
    Keywords: Critical current ; Ag/Bi-2223 tape ; flux creep ; ac susceptibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract True zero-field critical current densityJ c of a well-characterized BPSCCO/Ag tape has been determined by means of high-resolution ac susceptibility in the temperature range 77–110 K. The resultant values (30,000 A/cm2 at 77 K) agree well with the transportJ c of the same tape. Because of a very thin BPSCCO, the coreJ c determined from the imaginary part of the ac susceptibility is nearly the same as the zero field one. AllJ c 's follow the same (1-T/T c )n withn=1.45 dependence.J c shows an approximateH −0.5 field dependence over the explored temperature range. Accordingly, the variations ofJ c withT andH seem to be determined by the flux creep.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01320874
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    Paper (German National Licenses)
    Fulltext
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