A nacre formation-inspired dynamic self-generating barrier for environmental deposit-resistant thermal barrier coatingsOA
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 Zr_(3/7)Y_(8/21)Yb_(2/21)Gd_(2/21)O_(12/7)(YYbGdZO)coating with a biomimetic“dynamic self-response”functionality.The coating demonstrated high durability at 1400℃and remained stable for 100 h,with a reaction layer of only 18.8±1.5μm 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 nacrelike“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,diffusioncontrolled 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.
Yao-Xu Zan;Lu Huang;Wei-Zheng Gu;Peng-Shuai Yue;Lin Dong;Mei-Jun Liu;Guan-Jun Yang
State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,ChinaState Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,ChinaState Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,ChinaState Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,ChinaState Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,ChinaState Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,ChinaState Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China
矿业与冶金
multicomponent rare-earth(MRE)bucklingbiomimetic multilayer coatingenvironmental deposit resistancedefense barrier
《Journal of Advanced Ceramics》 2026 (1)
P.161-185,25
supported by the National Natural Science Foundation of China(Nos.52471092 and 52301102)the Postdoctoral Research Foundation of China(No.2024M752571)the Fundamental Research Funds for the Central Universities.
评论