On Interface Oxidation Process of 8 wt.%Y2O3-ZrO2/CoNiCrAIY Thermal Barrier Coating.

Comprehensive Numerical Simulation on Thermally Grown Oxide and Internal Stress Evolutions in Thermal Barrier Coatings

“…For instance, Evans et al [2] comprehensively reviewed TGO formation mechanisms based upon thermodynamics and inner stress during thermal cycling test using dissimilar elastic model with the periodic oscillation of amplitude A and wave length L. They strongly supported TGO rumpling phenomenon [3] for explanation of TBC delamination mechanism using stress analysis of the elastic model. Arai et al [4], [5] showed TGO growth rate rule that was identified from the cross-sectional observation of the TBC sample exposed at constant temperature and cyclic changed temperature. Similar studies can find out other references [6], [7].…”

Influence of high-temperature creep stress on growth of thermally grown oxide in thermal barrier coatings

“…Recently, large local stress has been found to cause a change in both the diffusion constant of oxygen through an existing oxide and the rate of chemical reaction at an interface between the oxide and an oxidized material [7][8][9][10][11]. Since a large stress occurs in the TBC coating from the thermal stress and the volume expansion of the newly grown oxide, the growth rate of TGO may be changed depending on not only temperature but also stress.…”