Title :
Bi-2223/Ag tapes prepared by high temperature sintering
Author :
Xia, S.K. ; Lisboa, M.B. ; Serra, E.T. ; Rizzo, AndF
Author_Institution :
Centro de Pesquisas de Energia Eletrica, CEPEL, Rio de Janeiro, Brazil
fDate :
3/1/2001 12:00:00 AM
Abstract :
Heat treatments of Bi-2223/Ag tapes were performed through the continuous cooling sintering (CCS) method, by which the tapes are heated to high temperatures above the 2223 single-phase region, then cooled with a slow rate. The results indicated that the tapes prepared at higher temperature exhibit higher grain packing density and less porosity than those prepared at lower temperatures. As a result, the critical current density is improved. On the other hand, the tapes sintered at high temperatures contain more Pb-rich phases than those sintered at low temperatures. This drawback may be solved by controlling overall Pb concentration in precursor powders
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); crystal microstructure; heat treatment; high-temperature superconductors; porosity; silver; sintering; strontium compounds; superconducting tapes; Bi22Ca2Cu3O8-Ag; Bi2Sr2Ca2Cu3O8 /Ag tapes; CCS method; Pb-rich phases; continuous cooling sintering; critical current density; grain packing density; heat treatment temperature; high temperature sintering; porosity; Carbon capture and storage; Cooling; Critical current density; Heat treatment; Microstructure; Powders; Superconducting films; Telephony; Temperature; X-ray scattering;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
