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首页> 外文期刊>Journal of power sources >Oxidation resistance of novel ferritic stainless steels alloyed with titanium for SOFC interconnect applications
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Oxidation resistance of novel ferritic stainless steels alloyed with titanium for SOFC interconnect applications

机译：SOFC互连应用中与钛合金化的新型铁素体不锈钢的抗氧化性

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摘要

Chromia (Cr_2O_3) forming ferritic stainless steels are being developed for interconnect application in Solid Oxide Fuel Cells (SOFC). A problem with these alloys is that in the SOFC environment chrome in the surface oxide can evaporate and deposit on the electrochemically active sites within the fuel cell. This poisons and degrades the performance of the fuel cell. The development of steels that can form conductive outer protective oxide layers other than Cr_2O_3 or (CrMn)_3O_4 such as TiO_2 may be attractive for SOFC application. This study was undertaken to assess the oxidation behavior of ferritic stainless steel containing 1 weight percent (wt.%) Ti, in an effort to develop alloys that form protective outer TiO_2 scales. The effect of Cr content (6-22 wt.%) and the application of a Ce-based surface treatment on the oxidation behavior (at 800 ℃ in air+ 3% H_2O) of the alloys was investigated. The alloys themselves failed to form an outer TiO_2 scale even though the large negative AC of this compound favors its formation over other species. It was found that in conjunction with the Ce-surface treatment, a continuous outer TiO_2 oxide layer could be formed on the alloys, and in fact the alloy with 12 wt.% Cr behaved in an identical manner as the alloy with 22 wt.% Cr.
机译：正在开发形成铬（Cr_2O_3）的铁素体不锈钢，以将其互连应用在固体氧化物燃料电池（SOFC）中。这些合金的问题在于，在SOFC环境中，表面氧化物中的铬会蒸发并沉积在燃料电池内的电化学活性位点上。这中毒并降低了燃料电池的性能。可以形成除Cr_2O_3或（CrMn）_3O_4之外的诸如TiO_2的导电外部保护性氧化物层的钢的开发对于SOFC应用可能具有吸引力。这项研究旨在评估含1％（重量）Ti的铁素体不锈钢的氧化行为，以努力开发形成保护性TiO_2外皮的合金。研究了Cr含量（6-22 wt。％）和Ce基表面处理对合金氧化行为（在空气中800℃+ 3％H_2O时）的影响。即使该化合物的较大的负AC有利于其形成而不是其他物种，合金本身也无法形成外部TiO_2鳞片。已经发现，与铈表面处理相结合，可以在合金上形成连续的外部TiO_2氧化层，并且实际上具有12 wt。％Cr的合金的行为与具有22 wt。％Cr的合金相同。铬

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