METHOD FOR LIQUID-PHASE SYNTHESIS OF MULTI-COMPONENT CERAMIC MATERIAL IN ZrO-YO-GdO-MgO SYSTEM FOR PRODUCTION OF ELECTROLYTE FOR SOLID OXIDE FUEL CELL Russian patent published in 2017 - IPC H01M8/12 C04B35/48 C04B35/622 C01G25/02 C01F17/00 C01F5/00 

FIELD: chemistry.

SUBSTANCE: invention may be used for production of electrolyte for solid oxide fuel cell. Liquid-phase synthesis of multi-component ceramic material in ZrO₂-Y₂O₃-Gd₂O₃-MgO system is carried out by selecting salts ZrO(NO₃)₂⋅2H₂O, Y(NO₃)₃⋅5H₂O, Gd(NO₃)₃⋅6H₂O and Mg(NO₃)₂⋅6H₂O as initial reagents. Above salts are used to prepare diluted solutions. Reverse precipitation of hydroxides from respective salts is carried out using aqueous ammonia solution NH₄OH till complete precipitation of all hydroxides and occurrence of the precipitate. Gel-like precipitate is filtered and frozen at -25°C for 24 hours. Synthesized powder of solid solution (ZrO₂)_0.92(Y₂O₃)_0.03(Gd₂O₃)_0.03(MgO)_0.02 is subject to thermal treatment at 800°C. Then compacts are formed by the method of uniaxial pressing under pressure of 150 MPa. Above compacts are burned at a temperature of 1400°C in the tube heater with isothermal holding for 2 h and heating rate of 350-400°C/h.

EFFECT: invention allows to lower precipitate agglomeration degree, increase its dispersivity and homogeneity and also hydroxide precipitation completeness.

4 dwg, 2 tbl