Fracture mechanism maps for thermal barrier coatings subjected to single foreign object impact

• Published in: Wear Vol. 414-415; pp. 303 - 309
• Main Authors: Zhu, W., Jin, Y.J., Yang, L., Pi, Z.P., Zhou, Y.C.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.11.2018; Elsevier Science Ltd
• Subjects: Coating effects; Crack initiation; Cracks; Electron beams; Erosion; Erosion mechanisms; Failure mechanisms; Finite element analysis; Finite element method; Fracture mechanics; Fracture mechanism map; Fractures; Impact angle; Nucleation; Parameters; Physical vapor deposition; Thermal barrier coatings; Finite element method; Thermal barrier coatings; Fracture mechanism map; Erosion
• ISSN: 0043-1648; 1873-2577
• DOI: 10.1016/j.wear.2018.08.020

To further understand the erosion mechanism of the electron beam physical vapor deposited thermal barrier coatings, the failure mechanism diagrams with different parameters were established by finite element simulations. The effects of various parameters on foreign object erosion were discussed. The location and type of coating cracks under different conditions were predicted. It was found that the possibility of crack nucleation increases with the increase of the particle velocity, particle radius and impact angle. Compared to the structural and material parameters of thermal barrier coatings, the erosion particle parameters (particle velocity, particle radius and impact angle) have a greater effect on the coating failure. All of these results give corresponding suggestions and advices for process optimization of thermal barrier coatings. •The fracture mechanism maps of EB-PVD TBCs are established.•The effects of various parameters on foreign object erosion are discussed.•Compared with the structural parameters, the erosion particle parameters have an obvious influence on coating failure.