Evaluation of a Surface Treatment on the Performance of Stainless Steels for SOFC Interconnect Applications.

Alman, D. E. ; Holcomb, G. R. ; Adler, T. A. ; Wilson, R. W. ; Jablonski, P. D.

Technical Information Center Oak Ridge Tennessee

关键词: Solid oxide fuel cells;    Stainless steels;    Surface finishing;    Cerium;    Oxidation;   

RP-ID  :  DE2007916949

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Pack cementation-like Cerium based surface treatments have been found to be effective in enhancing the oxidation resistance of ferritic steels (Crofer 22APU) for solid oxide fuel cell (SOFC) applications. The application of either a CeN- or CeO2 based surface treatment results in a decrease in weight gain by a factor of three after 4000 hours exposure to air+3%H2O at 800 deegres C. Similar oxide scales formed on treated and untreated surfaces, with a continuous Cr-Mn outer oxide layer and a continuous inner Cr2O3 layer formed on the surface. However, the thickness of the scales, and the amount of internal oxidation were significantly reduced with the treatment, leading to the decrease in oxidation rate. This presentation will detail the influence of the treatment on the electrical properties of the interconnect. Half-cell experiments (LSM cathode sandwiched between two steel interconnects) and full SOFC button cell experiments were run with treated and untreated interconnects. Preliminary results indicate the Ce treatment can improve SOFC performance.