Method for producing NiO / YSZ composite powder

摘要

PROBLEM TO BE SOLVED: To provide a production process of NiO/YSZ complex powder capable of contributing enhancement of power-generation characteristics and durability of a solid electrolyte type fuel cell and improved in powdery composition and organization. SOLUTION: This production process of NiO/YSZ(Y2 O3 -stabilized ZrO2 ) comprises (1) a solution preparation step in which a source solution containing Ni ion, Zr ion and Y ion in a predetermined ratio is prepared; (2) a coprecipitation step in which a solid material (a coprecipitated material) is coprecipitated by mixing a precipitation solution capable of precipitating the solid material containing at least one of above metals and oxygen from the above source solution and (3) a decomposition step in which the coprecipitated material is decomposed and powdery material (NiO/YSZ complex powder) containing each of the above metal oxides is obtained.