Abstract: 3Y-TZP was added to 8YSZ by means of mechanical mixing in order to first fulfill the need of electrical property as electrolyte and improve its mechanical property. The samples were sintered in air. The effects of 3Y-TZP addition were investigated through the tests of fracture toughness, bending strength, electrical conductivity and phase composition analysis. The results show that 3Y-TZP improves the mechanical property of 8YSZ material. The fracture toughness and bending strength increase obviously with the increase of 3Y-TZP addition and the conductivity of 8YSZ electrolyte materials dope slightly within 0- 30%. The electrical material when the amount of 3Y-TZP reaches up to 30% embodies excellent properties, with an electrical conductivity of 0.11 S/cm at 1000 ℃ and bending strength of 300 MPa.

Key words: transformation toughening%solid electrolyte%3Y-TZP%8YSZ