Evaluation of Solid Particle Erosion of EB-PVD TBCs under Thermal Cycling Conditions Based on a Stochastic Approach

The solid particle erosion behavior of electron-beam physical vapor deposition (EB-PVD) thermal barrier coatings (TBCs) was numerically evaluated under cycling conditions. rates were calculated based on the mechanics-based formulae where model parameters are fitted to temperature-process-dependent test data available in literature. A stochastic approach applied simulate toward service then validated by experimentally measured temperature and sintering-dependent from pseudoductile is identified for silica particles EB-PVD topcoat (TC) system above intermediate temperatures (~220 °C) due softening partial molten particles, thus leading an increase cutting wear a decrease deformation wear. found versus but cycles. Such could be attributed propagation sintering cracks induced at elevated temperatures. parametric calculations show that both have profound effect mechanism TC. rate increases higher velocity accumulated mass displays variation impacting angles. Two types mechanisms different Under burner with short high-temperature dwell period, TBCs governed temperature, while isothermal long determined time. failure processes discussed combining internal cracking within external surface topcoat.