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Studies on mechanical behavior of LSFT-CGO dual-phase membranes at elevated temperatures in ambient air and slightly reducing environments

机译:LSFT-CGO双相膜在高温和环境空气轻微还原的情况下的力学行为研究

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This paper discusses the mechanical behavior of La_(0.2)Sr_(0.8)Fe_(0.6)Ti_(0.4)O_(3-δ)(LSFT)-Ce_(0.9)Gd_(0.1)iO_(2-δ) (CGO) (40:60 vol%) dual-phase ceramic membranes at elevated temperatures in ambient air and slightly reducing conditions. Fracture strength of the LSTF-CGO membranes was observed to decrease upon exposure to increasing reducing conditions. Changes associated with the oxygen stoichiometry at elevated temperatures in the N_2 environment were shown to play a significant role in the fracture behavior of dual-phase membranes. In actual application environments-for example, in a reactor, where the pO_2 may vary from 0.2 to 10~(-14) atm-the mechanical stability of this type of dual-phase membrane primarily depends on the distribution of residual stresses arising from differential chemical/thermal expansion of the individual phases. The present study is of immense importance for anyone designing dual-phase ceramic membranes of LSFT-CGO for pertinent applications.
机译:本文讨论了La_(0.2)Sr_(0.8)Fe_(0.6)Ti_(0.4)O_(3-δ)(LSFT)-Ce_(0.9)Gd_(0.1)iO_(2-δ)(CGO)的力学行为(40:60体积%)的双相陶瓷膜在环境空气中升高温度和略微还原的条件下使用。在暴露于增加的还原条件下,观察到LSTF-CGO膜的断裂强度降低。 N_2环境中高温下与氧气化学计量有关的变化显示出在双相膜断裂行为中的重要作用。在实际应用环境中(例如,在反应堆中,pO_2可能在0.2至10〜(-14)atm之间变化),这种类型的双相膜的机械稳定性主要取决于微分引起的残余应力的分布。各个相的化学/热膨胀。对于设计用于相关应用的LSFT-CGO双相陶瓷膜的任何人,本研究都具有极其重要的意义。

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