Sobha, A; Dr.Syamaprasad,U(Cochin University of Science And Technology, December , 2002)
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Abstract:
It is important that long superconducting tape must have
desired strain tolerance (less reduction of Jc with applied strains) and
stress tolerance (less reduction of JC in applied stresses) for its use as
coils and magnets. Ag addition to the BPSCCO system has many
advantages with its physical and chemical inertness to the system,
reduces the processing temperature, and promotes the grain growth,
grain alignment and connectivity. All these not only enhance the
critical current density of the tapes but also improve the mechanical
properties. But the published results show very much scattering on the
type of Ag additive to be selected, method of addition and its optimum
percentage. Also there are some negative reports in this regard. The
present work has been undertaken to study the effect of silver addition
in different forms (Ag powder, Ag2O, AgNO3) on the superconducting
and mechanical properties of (Bi,Pb)-2223/Ag tapes and to find out a
suitable form of Ag additive and its optimum percentage to have better
superconducting and mechanical properties. Also it is the aim of the
present work is to optimise the process parameters needed to prepare
(Bi,Pb)-2223/Ag multifilamentary tapes of length ~ 12 m in solenoid
and pancake coil forms with good critical current density and
homogeneity of J C along the length of the tapes.
Description:
Department of physics, Cochin University of Science And Technology