SOFC作動環境下におけるランタンマンガナイト系カソード材料のクリープ特性

概要

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Creep properties of strontium doped lanthanum manganite (LSM) were studied in SOFC operating conditions, i.e. in the temperature range of 800°C to 1050°C and in air and argon gas environment. Although the difference of atmosphere did not affect creep properties, temperature and applied stress dependence of steady-state creep rate changed around 900°C. Considering previous reports, it was concluded that dominant creep mechanism of LSM in the temperature range of 950°C to 1300 °C was diffusion creep and the dominant creep mechanism changed at the temperature lower than 900°C. This indicated that dominant creep mechanism was grain boundary sliding creep. Because grain boundary sliding creep showed higher stress dependence and lower temperature dependence than diffusion creep, creep deformation during SOFC operation will be larger than expectations based on diffusion creep.