Multilayer GZ/YSZ thermal barrier coating from suspension and solution precursor thermal spray

Leng, K.; Rincon Romero, A.; Hussain, T.

Abstract

Rare-earth (RE) zirconates, such as gadolinium zirconate (GZ), gained much attraction to be used for the next generation TBC. A double-layer and triple-layer TBC were deposited using the suspension and solution precursor high velocity oxy fuel (HVOF) thermal spray. A dense solution precursor GZ layer was intended to minimise the crack propagation from underneath, thereby inhibiting the CMAS infiltration. In the furnace cycling test, the double- and triple-layer coatings had a comparable cyclic lifetime. For the CMAS test, both the double- and triple-layer coatings were exposed to CMAS at 1250 °C for 30 mins. The CMAS deposits melted and infiltrated both coatings through the dense vertical cracks (DVCs). Interestingly, the GZ reacted with the molten CMAS to form a gadolinium apatite phase (Ca2Gd8(SiO4)6O2) that was detected in the double- and triple-layer TBC. Both the double- and triple-layer TBCs succeeded in reacting with CMAS.

Citation

Leng, K., Rincon Romero, A., & Hussain, T. (2023). Multilayer GZ/YSZ thermal barrier coating from suspension and solution precursor thermal spray. Journal of the European Ceramic Society, 43(11), 4991-5003. https://doi.org/10.1016/j.jeurceramsoc.2023.04.014

• Journal Article Type: Article
• Acceptance Date: Apr 6, 2023
• Online Publication Date: Apr 18, 2023
• Publication Date: 2023-09
• Deposit Date: May 3, 2023
• Publicly Available Date: May 5, 2023
• Journal: Journal of the European Ceramic Society
• Print ISSN: 0955-2219
• Publisher: Elsevier BV
• Peer Reviewed: Peer Reviewed
• Volume: 43
• Issue: 11
• Pages: 4991-5003
• DOI: https://doi.org/10.1016/j.jeurceramsoc.2023.04.014
• Keywords: Thermal barrier coating; Gadolinium Zirconate; Yttria stabilised zirconia; Solution precursor HVOF; Suspension HVOF
• Public URL: https://nottingham-repository.worktribe.com/output/19779076
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0955221923002911?via%3Dihub
• Additional Information: This article is maintained by: Elsevier; Article Title: Multilayer GZ/YSZ thermal barrier coating from suspension and solution precursor thermal spray; Journal Title: Journal of the European Ceramic Society; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.jeurceramsoc.2023.04.014; Content Type: article; Copyright: © 2023 The Authors. Published by Elsevier Ltd.