The effect of TiO2 additives on the structural stability and thermal properties of yttria fully-stabilized zirconia

摘要

TiO2(0–20 mol%)-8 mol% YSZ (8YSZ) ceramics were synthesized by a traditional solid-state reaction method. A cubic single phase was observed for 8YSZ, 4 mol% TiO2-8YSZ and 8 mol% TiO2-8YSZ. Tetragonal and cubic mixed phases were observed for 12–20 mol% TiO2-8YSZ ceramics. The sintering temperature was 1,700 °C for 8YSZ and 4 mol% TiO2-8YSZ ceramics, whereas it was 1,500 °C for 8–20 mol% TiO2-8YSZ. The thermal conductivity at room temperature decreased in proportion to increasing TiO2 content, from 3.0 to 2.3 W/m K. The specific heat of TiO2-8YSZ ceramics was unaltered as the TiO2 content changed.