Bojan Marinkovic - Academia.edu (original) (raw)
Uploads
Papers by Bojan Marinkovic
Materials Letters, 2006
It is demonstrated that it is possible to reform in air atmosphere considerable amounts of (Bi,Pb... more It is demonstrated that it is possible to reform in air atmosphere considerable amounts of (Bi,Pb)-2223 phase within Ag environment after complete peritectic melting of this phase. The key feature of here proposed complete melting-reformation process is the minimization of Pb-losses, where only about 1.57 wt.% of total Pb content was lost over whole process. Therefore, an adequate melting temperature slightly above the peritectic melting onset of the (Bi,Pb)-2223/Ag composite and slow cooling (0.1°C/min) conditions should be used in order to keep the system in near-equilibrium conditions. This new route for (Bi,Pb)-2223 formation within Ag environment, including the participation of a thermodynamically stable liquid, should overcome some microstructural problems present nowadays in the conventionally prepared (Bi,Pb)-2223/Ag tapes, such as voids, cracks and bad grain connectivity.
Journal of Physics: Conference Series, 2006
ABSTRACT Considerable fractions of (Bi, Pb)-2223 were recovered after the complete peritectic mel... more ABSTRACT Considerable fractions of (Bi, Pb)-2223 were recovered after the complete peritectic melting of that phase. The minimization of Pb-losses was a key-feature, so that only about 1.57 wt % of total Pb content was lost over the whole process. Therefore the system remained within the 2223 single-phase region. The new route employed here, including the participation of a stable liquid, should overcome some microstructural problems nowadays present in sintered 2223/Ag tapes, such as voids, cracks and bad grain connectivity. Further optimization of the complete melting-reformation process may reduce the fraction of secondary superconducting phases, which can act as weak-links.
Materials Letters, 2006
It is demonstrated that it is possible to reform in air atmosphere considerable amounts of (Bi,Pb... more It is demonstrated that it is possible to reform in air atmosphere considerable amounts of (Bi,Pb)-2223 phase within Ag environment after complete peritectic melting of this phase. The key feature of here proposed complete melting-reformation process is the minimization of Pb-losses, where only about 1.57 wt.% of total Pb content was lost over whole process. Therefore, an adequate melting temperature slightly above the peritectic melting onset of the (Bi,Pb)-2223/Ag composite and slow cooling (0.1°C/min) conditions should be used in order to keep the system in near-equilibrium conditions. This new route for (Bi,Pb)-2223 formation within Ag environment, including the participation of a thermodynamically stable liquid, should overcome some microstructural problems present nowadays in the conventionally prepared (Bi,Pb)-2223/Ag tapes, such as voids, cracks and bad grain connectivity.
Journal of Physics: Conference Series, 2006
ABSTRACT Considerable fractions of (Bi, Pb)-2223 were recovered after the complete peritectic mel... more ABSTRACT Considerable fractions of (Bi, Pb)-2223 were recovered after the complete peritectic melting of that phase. The minimization of Pb-losses was a key-feature, so that only about 1.57 wt % of total Pb content was lost over the whole process. Therefore the system remained within the 2223 single-phase region. The new route employed here, including the participation of a stable liquid, should overcome some microstructural problems nowadays present in sintered 2223/Ag tapes, such as voids, cracks and bad grain connectivity. Further optimization of the complete melting-reformation process may reduce the fraction of secondary superconducting phases, which can act as weak-links.