Effect of Additives on the Morphology and Superconductivity of YBa(2) Cu(3)O(6+x) Ceramic Superconductors
Interim rept. Oct 1989-Sep 1990
DAVID TAYLOR RESEARCH CENTER BETHESDA MD SHIP MATERIALS ENGINEERING DEPT
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Superplastic deformation is being studied as a means to turn the new ceramic superconductors into useful Naval hardware. Superplastic deformation can occur when a small grained material is subjected to stress at temperatures that are at least a half of their melting point. The ceramic superconductors, of which YBa2Cu3O6x is typical, require sintering treatments to create reasonably dense materials. However, sintering can result in a degree of grain growth that will not benefit superplastic deformation. To resolve the conflict of the need for full density with the need for a small grain size, the use of separate additives of Al2O3 and Ag2O particles to inhibit grain growth during sintering has been studied.
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