| 摘要 |
PURPOSE:To obtain a solid electrolytic ceramic excellent in electric conductivity by forming from a specific ratio of ZrO2, Y2O3, Al2O3 and inevitable impurities and having a prescribed crystal grain diameter, coefficient of thermal expansion and bending strength. CONSTITUTION:A ZrO2 powder, Y2O3 powder and an Al2O3 powder are blended in the specific ratio and the blended material is wetly mixed by a ball mill or the like and dried, granulated and formed into the prescribed shape. Next, the molded body is fired at 1500-1700 deg.C to obtain the solid electrolytic ceramic formed from 5-10wt.% Y2O3, 0.5-15wt.% Al2O3, 0.5wt.% inevitable impurities such as SiO2 and balance ZrO2 and having 5-15mum average crystal grain diameter, >=9X10<-6>/ deg.C coefficient of thermal expansion at room temp. to 1000 deg.C and >=30kg/cm<3> bending strength. And the supporting body for solid electrolyte is obtained by forming a protective layer composed of a ZrO2 ceramic containing 5-10mol% Y2O3 on the surface of a ZrO2 ceramic containing 10-20mol% CaO and controlled to 20-45% in open porosity. |
