Metal Connecting Coating MnCo₂O₄Film By Sol-gel Process And Performance Study

With the development of low temperature Solid Oxide Fuel Cell, make the possible use of metal connection, compared with the traditional high temperature SOFC using ce-ramie connection body, metal connection has low cost and ease of processing advanta-ges.because iron base heat resistant alloy has rich resources and other components to ma-tch the expansion of Fuel cells coefficient, as SOFC connection body material metal co nnection attracte much attention.This paper adopts the SUS430materials as SOFC metal connecting material, in order to curb material Cr volatilization and enhance high temperature oxidation resistance, coated with spinel structure MnCo2O4protective film by use of sol gel method in SUS430surface, using XRD, SEM and laser confocal, metallographic microscope, study the phase structure of membrane material, surface microstructure, characterizing the three-dimensional structure coating process on protective membrane integrity was and the influence of the density, and studies the connection with protective film material of oxidation resistance and protective film materials and cathode materials of chemical compatibility.(1)To nitric acid manganese and cobalt nitrate as raw material, citric acid, were used respectively to three ligands, polyacrylic acid and EDTA sol-gel preparation of dry gel in air750℃for2h, MnCo2O4powder materials with a spinel structure was obtained.(2) Using citric acid as ligand obtained sol in SUS430stainless steel surface coating, and after40intermittent ventilation, dry, and then under the reducing atmosphere heat treatment1h750℃,750℃heat treatment under1h in air again, after twice coated, ultimately with dense, complete the surface of the protective film.(3)The coating substrate in air oxidation resistance under750℃test, coating substrates within200h weight ceaselessly, coating substrates during200h oxidation weight increase of0.75mg/cm, while SUS430substrate oxidation weight1.96mg/cm and after200h, the coating substrate oxidation weight more slowly, the results show that MnCo2O4coating obviously improve the high temperature oxidation resistance of SUS430substrate material. (4) Coating materials and cathode materials calcined in air for24h under750℃, XRD results show that no new phase formation, coating materials and cathode materials has good chemical compatibility.