Preparation of Bi-2223/Ag tapes by controlling precursor powders

Xia, S.K.; Lisboa, M.B.; Polasek, A.; Sens, M.A.; Serra, Eduardo Torres; Rizzo, F.; Borges, H. A.

doi:10.1016/s0921-4534(01)00119-8

Cited by 4 publications

(1 citation statement)

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“…Furthermore, one of the keys to prepare samples which exhibit high critical current densities (J c ) is to control the grain size. Many groups reported that with the PIT process, a small grain size is favourable to obtain a high J c [11][12][13][14]. A fine precursor powder increases the reactivity, which under appropriate conditions promotes the Bi2223 phase formation and increases the intergrain connectivity.…”

Section: Introductionmentioning

confidence: 99%

Sinter-forging of strongly textured Bi2223 discs with largeJ_cs: nucleation and growth of Bi2223 from Bi2212 crystallites

Guilmeau

Chateigner

Noudem

2002

Supercond. Sci. Technol.

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Dense Bi2223 superconductor discs with a highly oriented structure were prepared by the sinter-forging method. A detailed investigation of the processing parameters has been carried out on the phase assemblage, the particle size of the calcined precursor powder and the sinter-forging time and temperature. A high transport critical current density, J c , was obtained from a starting powder rich in Bi2212 and secondary phases. Using fine powder, a high degree of orientation, larger than those of multifilamentary tapes, and excellent intergrain connection were observed. The optimal sinter-forging temperature was found to be in the range of 845-850• C and the transport critical current densities reached values of 12 700 A cm −2 at 77 K in self-field. The combination of textural and microstructural investigations testify that a nucleation-growth mechanism from the Bi2212 particles is responsible for the Bi2223 phase formation, rather than an intercalation process.

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Section: Introductionmentioning

confidence: 99%