Abstract
Oscillations in temperature and oxygen partial pressure were introduced during the oxidation of melt‐spun ribbons to produce superconducting microlaminate tapes consisting of alternating and silver‐rich layers oriented parallel to the tape plane. Microstructural and microchemical evolution during oxidation, with and without such oscillations, is discussed. Isothermal oxidation (400°C, ) of ribbons occurred at a parabolic rate, and the oxidized zone consisted of oxide particles dispersed in silver. No significant chemical segregation was observed during isothermal oxidation. However, significant chemical segregation was produced when sudden oscillations in temperature and oxygen partial pressure were introduced during oxidation. Such chemical segregation resulted in the formation of and silver‐rich layers after post‐oxidation annealing. The number and thicknesses of these layers could be varied by controlling the number and duration of oscillations introduced during oxidation.
Published Version
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