@article{Zan2026, 
author = {Yao-Xu Zan and Lu Huang and Wei-Zheng Gu and Peng-Shuai Yue and Lin Dong and Mei-Jun Liu and Guan-Jun Yang},
title = {A nacre formation-inspired dynamic self-generating barrier for environmental deposit-resistant thermal barrier coatings},
year = {2026},
journal = {Journal of Advanced Ceramics},
volume = {15},
number = {1},
pages = {9221218},
keywords = {multicomponent rare-earth (MRE), buckling, biomimetic multilayer coating, environmental deposit resistance, defense barrier},
url = {https://www.sciopen.com/article/10.26599/JAC.2025.9221218},
doi = {10.26599/JAC.2025.9221218},
abstract = {To address the challenge of corrosion in thermal barrier coatings (TBCs) by low-calcium-silica-ratio, impurity-containing environmental deposits (CMAS-E) in advanced aeroengines, this study, inspired by the adaptive defense mechanism of nacre formation, designs a Zr3/7Y8/21Yb2/21Gd2/21O12/7 (YYbGdZO) coating with a biomimetic “dynamic self-response” functionality. The coating demonstrated high durability at 1400 °C and remained stable for 100 h, with a reaction layer of only 18.8±1.5 μm and no buckling failure mode. The origin of this resistance lies in the high reactivity of the YYbGdZO layer, which, upon contact with the molten “stimulus”, forms a multifunctional dynamic self-generating barrier in situ via a rapid interfacial reaction. This barrier consists of an outer continuous rare-earth (RE) silicate layer for physical blockade and an inner apatite/fluorite composite that is structurally analogous to a nacre-like “brick-and-mortar” architecture, which synergistically achieves chemical passivation and suppresses ion diffusion. This efficient sealing response transforms the entire corrosion process from an initial stage of rapid infiltration and reaction into a slow, diffusion-controlled stage governed by this dense barrier, which follows a parabolic law. The biomimetic “dynamic self-response” mechanism elucidated in this work provides an effective new strategy for developing TBCs with long-term durability and high reliability against environmental deposit corrosion.}
}