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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和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)4O10(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 H2. 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)3O4 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)3O4 and Fe2O3 phases. The modified microstructure is found in the entire air manifold, with an increased thickness up to a distance of 300 μm 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the石（片状）（K，Mg，Fe）3 （Si，Al）4 O10 （OH）2矿物相之间的潜在相互作用。 sub>）和滑石粉（Mg3 Si4 O10 （OH）2 ），在模拟SOFC条件下进行腐蚀实验。垫圈的相对壁同时暴露于空气和湿H2 。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Cr2 O3 /（Cr，Mn）3 O4 双相层被复合物的较厚（5-10倍）层代替假定包含Cr2 O3 ，（Cr，Mn，Mg，Fe）3 O4 和Fe2 O3 相的组织。改性后的微结构存在于整个空气歧管中，厚度增加到距云母300μm。提出镁是促进氧化物形成的关键组分。观察到滑石的分解，这被认为是镁释放的机理。

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  • 来源
    《Journal of Materials Science》 |2007年第8期|2643-2651|共9页
  • 作者

    F. Wiener; M. Bram; H.-P. Buchkremer; D. Sebold;

  • 作者单位

    Institute for Materials and Processes in Energy Systems IWV Forschungszentrum Jülich GmbH Leo-Brandt-Str. 52425 Jülich Germany;

    Institute for Materials and Processes in Energy Systems IWV Forschungszentrum Jülich GmbH Leo-Brandt-Str. 52425 Jülich Germany;

    Institute for Materials and Processes in Energy Systems IWV Forschungszentrum Jülich GmbH Leo-Brandt-Str. 52425 Jülich Germany;

    Institute for Materials and Processes in Energy Systems IWV Forschungszentrum Jülich GmbH Leo-Brandt-Str. 52425 Jülich Germany;

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