Isothermal and cycle properties of EB-PVD yttria-partially-stabilized zirconia thermal barrier coatings at 1150 and 1300 °C

Phase evolution in an electron beam physical vapor deposited (EB-PVD) yttria-partially-stabilized zirconia thermal barrier coating (TBC) was examined during isothermal and cycle ageing at 1150 and 1300 °C in ambient air. The nonequilibrium tetragonal phase was transformed to tetragonal, and/or cubic and/or monoclinic phase during isothermal and cycle ageing, and these changes of phase depended on ageing temperature, duration and history as well as residual stress in TBC.