PSI - Issue 68

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2025) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 68 (2025) 908–914

European Conference on Fracture 2024 Fracture modeling and experimental study on interfacial adhesion in a thermal barrier coating system on Ni-based superalloys Elena Fedorova a,b *, Andrey Burov a , Egor Moskvichev a , Nadezhda Sukhodoeva b a Federal Research Centre for Information and Computational Technologies, 53, Mira Str., 660049 Krasnoyarsk, Russia b Siberian Federal University,79, Svobodny Pr., 660041 Krasnoyarsk, Russia Abstract This work aims to analyse the existing approaches to quantify the interfacial adhesion for multi-layered structurally heterogeneous coating systems on Ni-based superalloys as well to evaluate the ability of a proposed experimental technique. New designs of samples and test fixtures to measure the adhesion parameters are presented. The microstructural analysis is employed to study TBC layers thickness, its uniformity and geometry of the interfaces in pristine samples as well as to control the occurrence and spread of spallation during testing. Numerical study is carried out using a finite element model based on representation of the contact between coating components as a cohesive interaction. The main attention is paid to evaluate the effect of morphology and interfacial strength parameters on the stress state and cracking behavior of the coating during cooling stage. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers

Peer-review under responsibility of ECF24 organizers Keywords: Ni-based superalloy, TBC system, interfacial adhesion

1. Introduction Thermal barrier coatings (TBC) are widely used to protect the hot section structural components, such as aircraft gas turbine, against hot corrosion and large thermal gradients during service life. The TBC system obtained by electron beam physical vapor deposition (EB-PVD) on Ni-based superalloys is typically composed of three layers:

* Corresponding author. Tel.: +7 913-532-74-55. E-mail address: efedorova@sfu-kras.ru

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers 10.1016/j.prostr.2025.06.149