Open Access

REVIEW

Review of Numerical Simulation of TGO Growth in Thermal Barrier Coatings

by Quan Wen¹, Fulei Jing^1,*, Changxian Zhang¹, Shibai Tang¹, Junjie Yang^2,*

1 Aero Engine Academy of China, Aero Engine (Group) Corporation of China, Beijing, 101304, China
2 Institute for Aero Engine, Tsinghua University, Beijing, 100084, China

* Corresponding Authors: Fulei Jing. Email: ; Junjie Yang. Email:

(This article belongs to the Special Issue: Recent Trends in Thermal Barrier Coatings for Turbine Blades: Theory, Simulation, and Experiment)

Computer Modeling in Engineering & Sciences 2022, 132(2), 361-391. https://doi.org/10.32604/cmes.2022.019528

Received 01 November 2021; Accepted 31 December 2021; Issue published 15 June 2022

Abstract

Thermally grown oxide (TGO) is a critical factor for the service life of thermal barrier coatings (TBC). Numerical simulations of the growth process of TGO have become an effective means of comprehensively understanding the progressive damage of the TBC system. At present, technologies of numerical simulation to TGO growth include two categories: coupled chemical-mechanical methods and mechanical equivalent methods. The former is based on the diffusion analysis of oxidizing elements, which can describe the influence of bond coat (BC) consumption and phase transformation in the growth process of TGO on the mechanical behavior of each layer of TBC, and has high accuracy for the thickness evolution of TGO, but they cannot describe the lateral growth of TGO and the rumpling phenomenon induced. The latter focuses on describing the final stress and strain state after the growth of a specific TGO rather than the complete growth processes of TGO. Based on the measured TGO thickness growth curve, simulations of thickening and lateral growth can be achieved by directly applying anisotropic volumetric strain to oxidized elements and switching elements properties from the BC to the TGO.

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Keywords

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