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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.42  No.9 (2001)  >  pp.1872-1876

MATERIALS TRANSACTIONS
<<Previous article Vol.42  No.9 (2001)   pp.1872 - 1876 Next article>>

Effect of Cooling Process on Critical Current Density of Bi-2223/Ag Superconductive Tapes Prepared by Dip-Coating

Masaki Sumida1), Akiyoshi Matsumoto1) and Hiroaki Kumakura1)
1) National Institute for Materials Science (NIMS), Superconducting Materials Center

In this paper, effect of the cooling process is examined for the superconductive properties of high Tc Bi-2223/Ag tapes prepared by dip-coating. The short tapes are cooled after the isothermal heat treatment at a controlled temperature profile, which can refine the microstructure. The cooling rate and the slow cooling range are varied, showing that the optimum condition is found where the enhanced Jc is obtained compared to that of normal furnace cooling. Contrarily, Tc did not show an optimum under this condition but increased monotonously with a decrease in the cooling rate and an increase in the slow cooling range. From phase identification, microscopic observation, and quantitative analysis, the microstructure formation in the polycrystalline oxide layer during this process and its relation to these properties are discussed.


Keyword:
Bi-2223, superconductor, cooling process, dip-coating, critical current density

Received: June 30, 2003
Accepted: July 31, 2003 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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