Electrophoretic deposition of MnCr2O4 coating for solid oxide fuel cell metallic interconnects

In the present study, Mn-Cr spinel powder was synthesized through a solid state reaction. In the next step, the electrophoretic deposition (EPD) method was used to apply the MnCr2O4 spinel, as an oxidation-resistant layer on SUS 430 stainless steel with a potential of 300 V/cm. The coated and uncoated samples were then pre-sintered in air at 900°C for 3h, followed by cyclic oxidation at 800°C for 500h. In order to study the effect of reducing pre-sintering atmosphere on oxidation resistance, the coated specimen was pre-sintered in 5% H2/Ar at 900°C for 3h, followed by cyclic oxidation at 800°C for 500h. The results of the oxidation resistance tests revealed that the MnCr2O4 spinel coating improved the oxidation resistance of the uncoated sample; and also, the oxidation rate constant (Kp) for pre-sintered coating in 5% H2/Ar was nearly 14 times smaller than that of the one pre-sintered in air.

Keywords:

Solid Oxide Fuel Cell , Interconnect , Spinel , Electrophoretic Deposition , Oxidation Resistance ,