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首页> 外文学位 >Protective/conductive coatings for ferritic stainless steel interconnects used in solid oxide fuel cells.
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Protective/conductive coatings for ferritic stainless steel interconnects used in solid oxide fuel cells.

机译：固体氧化物燃料电池中用于铁素体不锈钢互连的保护/导电涂层。

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摘要

Ferritic stainless steels are the most commonly used materials for solid oxide fuel cell interconnect application. Although these alloys may meet the criteria for interconnect application for short periods of service, their application is limited for long-term use (i.e., 40,000 h) due to poor oxidation behaviour that results in a rapid increase in contact resistance. In addition, volatile Cr species migrating from the chromia scale can poison the cathode resulting in a considerable drop in performance of the cell. Coatings and surface modifications have been developed in order to mitigate the abovementioned problems.;In this study, composite electrodeposition of reactive element containing particles in a metal matrix was considered as a solution to the interconnect problems. Nickel and Co were used as the metal matrix and LaCrO3 particles as the reactive element containing particles. The role of the particles was to improve the oxidation resistance and oxide scale adhesion, while the role of Ni or Co was to provide a matrix for embedding of the particles. Also, oxidation of the Ni or Co matrix led to the formation of conductive oxides. Moreover, as another part of this study, the effect of substrate composition on performance of steel interconnects was investigated.;Numerous experimental techniques were used to study and characterise the oxidation behaviour of the composite coatings, as well as the metal-oxide scale interface properties. Scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDX), as well as surface analysis techniques including Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS) and secondary ion mass spectroscopy (SIMS), were used for the purpose of characterization. The substrate used for coating was AISI-SAE 430 stainless steel that is considered as a typical, formerly used interconnect material. Also, for the purpose of the metal-oxide scale interfacial study, ZMG232 stainless steel that is a specially designed interconnect alloy was used.;It is shown that the composite coatings greatly reduce the contact resistance and effectively inhibit Cr outward migration. In addition, it was determined that the presence of impurities in the steel, especially Si, and the absence of reactive elements drastically contribute to interconnect degradation.
机译：铁素体不锈钢是固体氧化物燃料电池互连应用中最常用的材料。尽管这些合金可以满足短期使用互连的标准，但是由于氧化性能差，导致接触电阻迅速增加，因此它们的应用仅限于长期使用（即40,000小时）。另外，从氧化铬垢移出的挥发性Cr物种会毒害阴极，导致电池性能显着下降。为了减轻上述问题，已经开发了涂层和表面改性方法。在本研究中，考虑将复合材料电沉积在金属基体中包含反应性元素的颗粒作为互连问题的解决方案。镍和钴用作金属基质，而LaCrO3颗粒用作含反应性元素的颗粒。颗粒的作用是改善抗氧化性和氧化物鳞片的附着力，而镍或钴的作用是提供嵌入颗粒的基质。而且，Ni或Co基体的氧化导致形成导电氧化物。此外，作为本研究的另一部分，研究了基体组成对钢互连性能的影响。；大量的实验技术被用来研究和表征复合涂层的氧化行为，以及金属氧化物鳞片界面性能。扫描电子显微镜/能量色散X射线光谱（SEM / EDX）以及包括俄歇电子能谱（AES），X射线光电子能谱（XPS）和二次离子质谱（SIMS）在内的表面分析技术被用于表征的目的。用于涂层的基材是AISI-SAE 430不锈钢，被认为是一种典型的，以前使用的互连材料。另外，出于金属氧化物界面研究的目的，使用了一种特殊设计的互连合金ZMG232不锈钢。表明复合涂层大大降低了接触电阻并有效地抑制了Cr向外迁移。另外，已经确定钢中杂质的存在，特别是Si的存在，以及反应性元素的缺乏极大地导致了互连退化。

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  • 作者

    Shaigan, Nima.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 173 p.
  • 总页数 173
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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