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首页> 外文期刊>Journal of power sources >Self-healing atmospheric plasma sprayed Mn1.0Co1.9Fe0.1O4 protective interconnector coatings for solid oxide fuel cells
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Self-healing atmospheric plasma sprayed Mn1.0Co1.9Fe0.1O4 protective interconnector coatings for solid oxide fuel cells

机译：用于固体氧化物燃料电池的自修复式大气等离子喷涂Mn1.0Co1.9Fe0.1O4保护性互连涂层

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摘要

Dense coatings on metallic interconnectors are necessary to suppress chromium poisoning of SOFC cathodes. Atmospherically plasma sprayed (APS) Mn1.0Co1.9Fe0.1O4 (MCF) protective layers demonstrated reduced chromium related degradation in laboratory and stack tests. Previous analyses revealed strong microstructural changes comparing the coating's as-sprayed and operated condition. This work concentrates on the layer-densification and crack-healing observed by annealing APS-MCF in air, which simulates the cathode operation conditions. The effect is described by a volume expansion induced by a phase transformation. Reducing conditions during the spray process lead to a deposition of the MCF in a metastable rock salt configuration. Annealing in air activates diffusion processes for a phase transformation to the low temperature stable spinel phase (T < 1050 degrees C). This transformation is connected to an oxygen incorporation which occurs at regions facing high oxygen partial pressures, as there are the sample surface, cracks and pore surfaces. Calculations reveal a volume expansion induced by the oxygen uptake which seals the cracks and densifies the coating. The process decelerates when the cracks are closed, as the gas route is blocked and further oxidation continues over solid state diffusion. The self healing abilities of metastable APS coatings could be interesting for other applications. (C) 2017 Elsevier B.V. All rights reserved.
机译：金属互连器上的致密涂层对于抑制SOFC阴极的铬中毒是必不可少的。大气等离子喷涂（APS）Mn1.0Co1.9Fe0.1O4（MCF）保护层在实验室和烟囱测试中显示出减少的铬相关降解。先前的分析显示，与涂层的喷涂状态和操作条件相比，微结构发生了很大变化。这项工作集中于通过在空气中对APS-MCF进行退火而观察到的层致密化和裂纹修复，该过程模拟了阴极工作条件。通过相变引起的体积膨胀来描述该效果。喷涂过程中的条件降低会导致MCF沉积成亚稳岩盐构型。空气中的退火会激活扩散过程，使之转变为低温稳定的尖晶石相（T <1050摄氏度）。这种转变与氧气掺入有关，氧气掺入发生在面对高氧气分压的区域，因为存在样品表面，裂纹和孔表面。计算结果表明，由于氧气的吸收而引起的体积膨胀会封闭裂缝并致密化涂层。当裂缝闭合时，该过程减速，因为气体通道被阻塞，并且由于固态扩散而进一步的氧化继续进行。亚稳态APS涂料的自愈能力可能对其他应用很有趣。 （C）2017 Elsevier B.V.保留所有权利。

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