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- W62440810 abstract "Shock compression has several features which indicate a high potential for the processing of practical superconductors and for the synthesis of new superconducting phases/1/. By using shock waves a dynamic pressure pulse in the range 10-1000 kbar can be applied for a duration of order 1 ..mu..sec. The pressures, densities, temperatures, strain rates, and quench rates are substantially larger than for conventional processing methods. High quench rates could be used to synthesize new metastable high-T/sub c/ phases, where T/sub c/ is the superconducting critical transition temperature. The fast nature of the process also permits the heterogeneous processing of powders. That is, by compacting powders in a ..mu..sec, compressive energy is deposited heterogeneously on particle boundaries. This dynamic method offers the opportunity to achieve high density and to selectivity process the grain boundary region in high-T/sub c/ superconductors. Since controlling the grain boundary region is essential to achieving high critical current density J/sub c//3/, shock compaction might produce the microstructure required for high J/sub c/. An example is given of shock compaction of YBa/sub 2/Cu/sub 3/O/sub 7/ + Ag powders. 6 refs., 2 figs." @default.
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- W62440810 date "1988-09-01" @default.
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- W62440810 title "Shock compaction of superconductors" @default.
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