کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1287846 1497997 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preparation and high temperature performances of DyCrO3-based coatings on a ferritic stainless steel interconnect material
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Preparation and high temperature performances of DyCrO3-based coatings on a ferritic stainless steel interconnect material
چکیده انگلیسی

The major concerns with the ferritic stainless steel interconnects of solid oxide fuel cells operated at intermediate temperatures are the growth of non-protective oxide scales and the Cr evaporation into the cathode, which can increase significantly the cell resistance and polarization resistance. An additional coating is needed to solve these problems. Perovskite DyCrO3-based coatings for a type 430 stainless steel (430SS) interconnect are prepared by a high-energy micro-arc alloying (HEMAA) process using a rod of DyCrO3-20 wt.%Ni as the deposition electrode. Area specific resistance and oxidation behavior of the uncovered and covered steel at 850 °C in both air and wet air are examined. The as-deposited DyCrO3-based coatings are mainly composed of DyCrO3 with some Ni and (Ni,Fe)Cr2O4, with a metallurgical bonding to the substrate. The coated steel in both air and wet air has a relatively fast mass gain in the initial stage, followed by a very low mass gain, forming a three-layered scale with a NiFe2O4 outer layer, a thick DyCrO3 sublayer and a thin Cr2O3-rich inner layer. The DyCrO3-based coatings can inhibit significantly the oxidation of 430SS, especially the breakaway oxidation in wet air, and have a low area specific electrical resistance.


► DyCrO3-based coatings for a type 430 stainless steel interconnect were studied.
► A high-energy micro-arc alloying process was employed to deposit DyCrO3 coatings.
► The coating inhibits the oxidation of the steel at 850 °C in air and air-10%H2O.
► The coating consists of external NiFe2O4, middle DyCrO3 and inner Cr2O3 layer.
► The coating can decrease the area specific electrical resistance of the steel.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 235, 1 August 2013, Pages 54–61
نویسندگان
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