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首页> 外文期刊>Journal of Materials Science >Chemical interaction between Crofer 22 APU and mica-based gaskets under simulated SOFC conditions
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Chemical interaction between Crofer 22 APU and mica-based gaskets under simulated SOFC conditions

机译：在模拟的SOFC条件下，Crofer 22 APU与云母基垫片之间的化学相互作用

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摘要

Mica gaskets and also composite gaskets containing compressive mica interlayers are under consideration as sealing materials in solid oxide fuel cells (SOFC). To study potential interactions between the interconnect steel Crofer22APU and the mineral phases vermiculite (exfoliated) (K, Mg, Fe) 3(Si, Al) O-4(10)(OH)(2)) and talc (Mg3Si4O10(OH)(2)), corrosion experiments were conducted in simulated SOFC conditions. The opposite walls of the gaskets were simultaneously exposed to air and wet H-2. A substantial increase in the thickness of the oxide layers formed by the interconnect steel is observed with specimen containing talc. The Cr2O3/(Cr, Mn)(3)O-4 duplex layer normally formed on the Crofer is replaced by a thicker (factor of 5-10) layer of a complex microstructure that is assumed to contain Cr2O3, (Cr, Mn, Mg, Fe)(3)O-4 and Fe2O3 phases. The modified microstructure is found in the entire air manifold, with an increased thickness up to a distance of 300 mu m from the mica. It is proposed that magnesium is the critical component responsible for the accelerated oxide formation. A decomposition of talc is observed, which is discussed as the mechanism for the release of magnesium.
机译：云母垫片以及包含压缩云母夹层的复合垫片正被考虑作为固体氧化物燃料电池（SOFC）中的密封材料。研究互连钢Crofer22APU与矿物相ver石（脱落）（K，Mg，Fe）3（Si，Al）O-4（10）（OH）（2））和滑石（Mg3Si4O10（OH）之间的潜在相互作用（2）），腐蚀实验是在模拟SOFC条件下进行的。垫圈的相对壁同时暴露于空气和湿H-2中。用含滑石的样品观察到互连钢形成的氧化物层的厚度大大增加。通常在Crofer上形成的Cr2O3 /（Cr，Mn）（3）O-4双相层被假定为包含Cr2O3（Cr，Mn， Mg，Fe）（3）O-4和Fe2O3相。在整个空气歧管中发现了改进的微观结构，厚度增加了，直到与云母的距离达到300微米。提出镁是促进氧化物形成的关键组分。观察到滑石分解，这被认为是镁释放的机理。

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