GS14 イットリア安定化ジルコニアのアニール劣化に及ぼす高応力の影響(GS-3 一般セツション3,一般セッション)

概要

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The 8mol% yttria stabilized zirconia (8YSZ) has been attractive as one of electrolyte materials for solid oxide fuel cell (SOFC). It has been widely known that there is hundreds MPa of internal stress existing in SOFC electrolyte, which could deteriorate electrolyte during the operation of SOFC. The purpose of the present study is to clarify the stress effect on the degradation of the 8YSZ electrolyte. The compressive stress of about 200 MPa was applied to the 8YSZ specimens, and then they were annealed at 1173〜1263 K for 0〜1000 h. The crystal structure and the conductivity of the specimens were examined before/after the annealing by conducting Raman spectroscopic analysis, impedance measurement, and observation with a scanning electron microscope (SEM). The conductivity of the specimen subjected to the compressive stress showed a initial drop during annealing, although there was no clear effect of the stress on the decreasing rate of the conductivity and also the crystal structur after annealing.
一般社団法人日本機械学会の論文
2011-07-16