Research On Design And Optimization Of 430 Stainless Steel Supported Solid Oxide Cell

As a kind of power generation device that can directly convert the chemistry in fuel into electricity,solid oxide fuel cell has great advantages of green and high efficiency,which has a profound impact on China’s energy development strategy.Traditional solid oxide fuel cells are supported by ceramic materials,which have many problems such as low strength,high production cost and immature sealing technology,using metal as the supporting frame can effectively solve the above problems.Therefore,this paper focuses on the industrial 430 stainless steel sheet and modifies it by coating,and then designs and optimizes the structure of solid oxide fuel cell.In this paper,430 stainless steel protective film with excellent properties was prepared by arc ion plating.The high-temperature oxidation behavior of the manganese cobalt spinel oxide film,the rare earth doped manganese cobalt spinel oxide film and the contrast samples were analyzed.Finally,the protective film for the support is obtained,which has the characteristics of good oxidation resistance,strong anti Cr toxicity and long-term stability.The results show that,the dense continuous protective film formed by manganese cobalt spinel oxide in the process of high temperature oxidation can effectively prevent the formation of Cr2O3 on the surface of stainless steel,and the Cr content on the surface after 1500 h of oxidation at 800 ℃ still remain within 40%,while the one of uncoated sample has exceeded 40%.The composite film formed by the rare earth doped manganese cobalt spinel oxide film can inhibit the diffusion of elements in the process of high-temperature oxidation,and then inhibit the growth of oxide film,the mass gain after 1500 h of oxidation is only 70% of that of undoped film,as a result,it has more excellent high-temperature stability and anti Cr toxicity.Then,the structure design and preparation process of solid oxide fuel cell were optimized on the basis of 430 stainless steel sheet with excellent performance.In view of the problems in industrial preparation,a new type of support is designed which can provide micron hole structure and improve the electrical conductivity of the support.On this basis,the cell layer with ideal structure were prepared by screen printing and arc ion plating respectively,and a set of effective preparation process for semi-battery was verified by various characterization methods.During the experiment,the porous support structure was filled with Ni O slurry,and then the new support was coated with an anode layer by screen printing method,followed by drying treatment with temperature control and auxiliary pressure.After drying,the battery should be processed by the binder removal process at 240 ℃ for 4 h,and then the first cycle of REDOX sintering at 950 ℃ to form a favorable anode structure.Then,the GDC electrolyte layer was prepared under the condition of arc ion plating process parameters with substrate temperature of 200 ℃ and arc direct current of 40 A.After heat treatment at 800 ℃,the dense electrolyte layer was obtained.Compared with the metal support prepared by powder metallurgy,the new type of support which uses industrial stainless steel and carries out structural design in this paper is easier to realize industrialization.The innovative application of arc ion plating technology in the field of support modification and cell preparation provides a new possibility for the commercialization of solid oxide fuel cells.