Preparation And Performance Research On Borate System Sealing Materials For Intermediate Temperature SOFC

Intermediate temperatures solid oxide fuel cell (IT-SOFC) is one kind of the most effective device which can convert hydrocarbon chemical energy to electrical energy through the electrochemistry responded.In recent years,it was got people's more and more regards in clean and highly effective distributional electricity generation. The planar-type solid oxide fuel cell (p SOFC) has the low consumption,the high power density,simple technics and so on merits have aroused in the worldwide scale universal interest, thus is the domestic and foreign development focal point. But we need prevent the fuel gas and the oxygen mixes when the fuel cell works under the high temperature, and causes the fuel cell stacks separate from the outsideair, this request fuel voltaic pile's sealing-in material has the good gas tightness, the insulating property, the thermostability and chemically stable and so on. Therefore, the sealing-in becomes one of limit plate type SOFC development technical difficulties. The present paper take the warm solid oxide compound fuel cell (IT-SOFC) the technology as the background, the research development can satisfy the plate-type IT-SOFC seal request the sealing-in material.In this article the optimization design borate sealing glass formula, the discussion composition forms mechanism's influence to the glass, the union phase diagram, determines the borate sealing glass initially the formation sector. Determination borate sealing glass charaTECristic temperature, definite sealing glass sealing-in temperature, discussion composition to sealing-in temperature, chemical stability and sealing-in performance influence. The system studied the BaO-Al₂O₃-B₂O₃-SiO₂ system sealing-in material to apply in takes SOFC anode material Ni-8YSZ generally the union charaTECristic and the moist performance, and discussed various components to the glass thermochemistry performance, the crystallization behavior as well as the vitro ceram microstructure influence. Prepares appropriate sealant in the operating temperature 600-850℃of pSOFC. After studying the hot rotational test glass and heat expansion unbalance estimate thermostability between anode material Ni-8YSZ crack contact surface. After the fuel cell operating temperature continues 100h the glass and the anode material Ni-8YSZ contact surface instead keeps one's promises the surface study chemistry stability.After preparation AC1 glass sealing material ball grinding 5h, the corresponding particle size in 0.61μm and 2.9μm neighbor, above 99% is smaller than separately in the corresponding total curve 9μm. After 800℃the heat treatment anode material Ni-8YSZ vitro ceram's host-crystal for the ceisian-felspar (BaAl₂Si₂O₈) and the few barium silicates (BaSiO3), has the high thermal-expansion coefficient and the good electric insulation performance. thermal-expansion coefficient (TEC) AC1 glass sealing material is 11.25×10^-6K^-1, with anode material Ni-8YSZ thermal-expansion coefficient 12.03×10^-6K^-1 close, conforms to IT-SOFC basically to the glass sealing material request. The sealing-in material glass's resistance reduces along with temperature increment, in 650-800℃, the resistance value in 104-105ω.cm² scopes, the n transition activation energy is 101.38 kJ/mol, explained that the sealing-in material glass dust has the quite good insulating ability, conforms to IT-SOFC to the sealing-in material insulation request. The high temperature infiltration performance study indicated that the AC1 glass sealing material may in IT-SOFC to the anode material Ni-8YSZ sealing. By tape-casting we can preparation the large and smooth ceramic-glass materials.