Effect of Superplastic Deformation on Ion Conductivity of Sc_2O_3 doped ZrO_2 to be used as Electrolyte inSOFC(Synergy by Microstructuring)

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概要

• 論文の詳細を見る

• The 4mol%Sc_2O_3 doped ZrO_2 (4ScSZ) shows superplasticity in a range of strain-rate at 1773K. The large elongation is caused by both of high strain-rate sensitivity and high strain hardening during the deformation. Ion concuctivity of the 4ScSZ, deformed superplastically in a relatively high strain-rate region, is higher than that of non-deformed one, indicating that the superplastic deformation can improve its conductivity. Roughly, two kinds of cavities can appear during superplastic deformation depending on its condition; they are (1) fine and equi-axial shaped cavities formed at grain boundary triple points and (2) flat ones formed along grain boundaries. We have found that the existence of the former ones in a specimen can improve its ion conductivity, whereas the latter ones can lower it. Superplastic deformation (SPD) under a proper condition may, therefore, improve ion conductivity of the 4ScSZ, i.e., SPD can show a synergistic effect.

• 一般社団法人日本機械学会の論文
• 2006-09-19

著者

• MOTOHASHI Yoshinobu

  The Research Center for Superplasticity, Ibaraki University

• Motohashi Yoshinobu

  The Research Center For Superplasticity Faculty Of Enginering Ibaraki University

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• Effect of Superplastic Deformation on Ion Conductivity of Sc_2O_3 doped ZrO_2 to be used as Electrolyte inSOFC(Synergy by Microstructuring)
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