LaCrO3-based coatings deposited by high-energy micro-arc alloying process on a ferritic stainless steel interconnect material

Effect of Sr and Ca dopants on oxidation and electrical properties of lanthanum chromite-coated AISI 430 stainless steel for solid oxide fuel cell interconnect application

“…Due to recent progresses in reducing the SOFC operating temperature from 1000 1C to less than 800 1C, it is possible to use more economical and accessible interconnect materials instead of expensive ceramic ones [12][13][14][15]. Among the investigated alloys as interconnect materials, ferritic stainless steels (FSSs) have attracted more attention due to their superior properties such as good TEC matches with that of other cell components, low cost, chemical stability and high oxidation resistance which is caused by a chromia scale formed on the FSS at temperature around 650 1C-800 1C in both oxidizing and reducing atmospheres [3].…”

“…This protective layer must have close TEC match with the substrate and must decrease Cr migration to the cathode [9,11]. Perovskite-type oxide coatings with the general formula of ABO 3 (such as LaCrO 3 , LaMnO 3 , LaCoO 3 and LaFeO 3 ), where A is a rare earth cation (e.g., La) and B is usually a transition metal (e.g., Cr), are among the most promising protective coatings [10,11,15,26]. Among them, lanthanum chromite coating shows superior properties such as good stability in oxidizing and reducing atmospheres and desirable surface adhesion in SOFC operating temperature range from 650 1C to 800 1C [14,15,[26][27][28].…”

FeAl-based coatings deposited by high-energy micro-arc alloying process for wet-seal areas of molten carbonate fuel cell

“…Recently, a new aluminization method based on the electrospark deposition (ESD) has been proposed to obtain directly a layer of FeAl intermetallic alloy on the type 316L stainless steel [14]. The prominent advantages of this method over IVD and other popular coating technologies such as chemical vapor deposition, slurry and thermal spraying are the possibility of realizing a diffusion coating with a high resistance to spallation and with a minimal thermal distortion [15,16]. Similarly, one of the present authors also introduced a simple and cost-effective high-energy micro-arc alloying (HEMAA) technique to the preparation of pinhole-free coatings for metallic bipolar plates of proton exchange membrane fuel cell, with a metallurgical bonding between the coating and the substrate alloy [17].…”

Oxidation behavior and electrical property of ferritic stainless steel interconnects with a Cr–La alloying layer by high-energy micro-arc alloying process

“…Recently, a novel and simple process based on high-energy micro-arc alloying (HEMAA) has been considered to directly deposit compact oxide coatings on ferritic stainless steels [20] by the authors' group. HEMAA is a micro welding technique using short-duration and high-current electrical pulses to deposit an electrode material on a metallic substrate, and thus normally can produce high-quality diffusion coatings at a lower cost, with a minimal thermal distortion or microstructural changes of the substrate due to low-energy transfer involved in the HEMAA process.…”

“…HEMAA is a micro welding technique using short-duration and high-current electrical pulses to deposit an electrode material on a metallic substrate, and thus normally can produce high-quality diffusion coatings at a lower cost, with a minimal thermal distortion or microstructural changes of the substrate due to low-energy transfer involved in the HEMAA process. In the authors' previous work [20], a LaCrO 3 -based coating has been deposited successfully on the type 430 stainless steel by HEMAA using a LaCrO 3 -Ni electrode, with a good oxidation resistance and a low electrical contact resistance. However, some micro-pores are present at the oxide layer/substrate alloy interface after oxidation.…”