Re-melting of Bi-2212/Ag laminated tapes by partial melting process
Ilyushechkin, A.Y., Yamashita, T., & Mackinnon, I.D.R. (2002) Re-melting of Bi-2212/Ag laminated tapes by partial melting process. Physica C : Superconductivity and Its Applications, 377(3), pp. 362-371.
Bi-2212 tapes are prepared by a combination of dip-coating and partial melt processing. We investigate the effect of re-melting of those tapes by partial melting followed by slow cooling on the structure and superconducting properties. Microstructural studies of re-melted samples show that they have the same overall composition as partially melted tapes. However, the fractional volumes of the secondary phases differ and the amounts and distribution of the secondary phases have a significant effect on the critical current. Critical current of Bi-2212/Ag tapes strongly depends on the maximum processing temperature. Initial J(c)'s of the tapes, which are partially melted, then slowly solidified at optimum conditions and finally post-annealed in an inert atmosphere, are up to 10.4 x 10(3) A/cm(2). It is found that the maximum processing temperature at initial partial melting has an influence on the optimum re-heat treatment conditions for the tapes. Re-melted tapes processed at optimum conditions recover superconducting properties after post-annealing in an inert atmosphere: the J(c) values of the tapes are about 80-110% of initial J(c)'s of those tapes.
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|Item Type:||Journal Article|
|Additional Information:||ISI Document Delivery No.: 596NV Times Cited: 7 Cited Reference Count: 19 Ilyushechkin, AY Yamashita, T Mackinnon, IDR Elsevier science bv Amsterdam|
|Keywords:||Bi-2212/Ag tapes, partial melting, critical current density, high temperature superconductors, superconducting properties, thick-films, microstructure, joints, growth, coils|
|Subjects:||Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Ceramics (091201)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Functional Materials (091205)
|Divisions:||Current > Institutes > Institute for Future Environments|
|Deposited On:||26 Feb 2013 01:44|
|Last Modified:||26 Feb 2013 23:39|
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