Development of low-temperature sintered Mn-Co spinel coatings on Fe-Cr ferritic alloys for solid oxide fuel cell interconnect applications

摘要

To reduce the sintering temperature of spinel coatings to a safe temperature for Fe-Cr ferritic alloys, an MnCo_2O_4-MnO_2 bicomponent coating has been prepared on SUS430 ferritic alloy by slurry coating, followed by air sintering at a temperature of 800 ℃. The resultant coating is stable during cyclic oxidation tests and is effective at improving the oxidation resistance of SUS430 alloy. The area-specific resistance of coated samples remains nearly constant during long-term oxidation at 800 ℃ and is less than 6 mΩ cm~2 even after oxidation for 1000 h. These results indicate that the low-temperature sintered MnCO_2O_4-MnO_2 coating is a promising protective material for Fe-Cr ferrite alloys, especially SUS430, which are seriously oxidized at temperatures ≥850 ℃.