J0802-4-2 高温・制御雰囲気下における固体酸化物形燃料電池電解質材料の機械特性評価([J0802-4]SOFC,PV,キャパシタ)

Abstract

Elastic modulus of typical electrolyte materials for solid oxide fuel cells, (Gd_2O_3)_<0.05>(CeO_2)_<0.9>, (Y_20_3)_<0.08>(Zr0_2)_<0.92>, La_<0.8>Sr_<0.2>Ga_<0.8>Mg_<0.15>Co_<0.05>O_<3-δ>, were evaluated by resonance method, small punch test and 4 point bending test. The measurements were carried out from room temperature to 1273 K under p(O_2)=10^<-4> atm. Elastic modulus of (Y_20_3)_<0.08>(Zr0_2)_<0.92> and La_<0.8>Sr_<0.2>Ga_<0.8>Mg_<0.15>Cp_<0.05>O_<3-δ> drastically decreased in the temperature range between 573 K and 873 K in resonance method. Similar dependencies were seen in 4 point bending test and small punch test. It was found that that elastic modulus by dynamic (resonance method) shows similar temperature dependency as those by static (small punch and 4 point bending tests) measurement techniques, although its absolute values were slightly different. It was demonstrated that the dynamic measurement technique is very useful for evaluating mechanical properties of SOFC materials as well as static measurement techniques.