Tailorable shielded compliance of thermal barrier coatings through laser texturing and microstructural modification: microfeature design and validation

Bogatyrev, Artem; Liao, Zhirong; Axinte, Dragos; Norton, Andy

Abstract

Thermal barrier coatings (TBCs) are widely used for protecting components from an aggressive environment and excessive temperatures. However, the top coat can lack thermal compliance and environmental resistance, promoting premature failure. This study provides an approach to design, produce, and evaluate the novel shielded-compliant TBCs to address these challenges. Top coat laser grooving can lower thermal mismatch levels and hinder crack propagation, whereas laser glazing can enhance strength and anti-corrosion performance. Material analysis for the glazed layer revealed large columnar grains alongside a stress-free structure compared to the as-sprayed coating. The digital image correlation (DIC) in-situ heating test showed vertical cracks after glazing already to be effective stress relief features, with the controlled grooves showing the most prominent compliance, as suggested by finite element analysis (FEA). Such a concept may be applied to any coating where increased thermal compliance or environmental protection is needed, making it a highly versatile tool.

Citation

Bogatyrev, A., Liao, Z., Axinte, D., & Norton, A. (2023). Tailorable shielded compliance of thermal barrier coatings through laser texturing and microstructural modification: microfeature design and validation. Journal of the European Ceramic Society, 43(8), 3704-3726. https://doi.org/10.1016/j.jeurceramsoc.2023.02.035

• Journal Article Type: Article
• Acceptance Date: Feb 13, 2023
• Online Publication Date: Mar 13, 2023
• Publication Date: 2023-07
• Deposit Date: May 9, 2023
• Publicly Available Date: May 10, 2023
• Journal: Journal of the European Ceramic Society
• Print ISSN: 0955-2219
• Electronic ISSN: 1873-619X
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 43
• Issue: 8
• Pages: 3704-3726
• DOI: https://doi.org/10.1016/j.jeurceramsoc.2023.02.035
• Keywords: Thermal barrier coating; Thermal compliance; Laser treatment; Top coat glazing; Digital image correlation
• Public URL: https://nottingham-repository.worktribe.com/output/17386549
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0955221923001255
• Additional Information: This article is maintained by: Elsevier; Article Title: Tailorable Shielded Compliance of Thermal Barrier Coatings through Laser Texturing and Microstructural Modification: Microfeature Design and Validation; Journal Title: Journal of the European Ceramic Society; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.jeurceramsoc.2023.02.035; Content Type: article; Copyright: © 2023 The Authors. Published by Elsevier Ltd.