Phase stability and thermal conductivity of La_2O_3, Y_2O_3 stabilized ZrO_2 ceramic for thermal barrier coating application

摘要

Rare earth oxides co-doped zirconia has been developed for application in thermal barrier coating (TBC) systems to promote the performance and durability. In this paper, the phase stability and thermal-physical properties of lmol.%La_2O_3, 4.5mol.%Y_2O_3 stabilized ZrO_2 (LaYSZ) were investigated. After 100 h heat treated at 1400°C, the content of monoclinic phase in LaYSZ was 2.32 mol%, which is lower than that in YSZ (46.9 mol%). Result indicates that the LaYSZ has better phase stability and lower thermal conductivity than YSZ. The LaYSZ system can be explored as the candidate material as ceramic layer in TBC.