Revealing corrosion mechanisms and enabling predictive lifetime assessment of high-entropy rare-earth disilicates with superior CMAS corrosion resistanceOA
High-entropy rare-earth(RE)disilicates are promising next-generation thermal/environmental barrier coating(T/EBC)materials.However,their resistance to calcium-magnesium-aluminosilicate(CMAS)corrosion and the underlying mechanisms remain insufficiently understood and require further improvement.This study aims to systematically investigate the CMAS corrosion behavior and predictive lifetime assessment of designed stoichiometric(Er_(1/4)Y_(1/4)Lu_(1/4)Yb_(1/4))_(2)Si_(2)O_(7)and non-stoichiometric(Er_(1/6)Tm_(1/6)Y_(1/15)Gd_(1/15)Lu_(4/15)Yb_(4/15))_(2)Si_(2)O_(7).The incorporation of Tm and Gd,characterized by their distinct ionic radii,is designed to enhance their phase stability.Mechanistic analysis reveals that lattice distortion induced by multication doping suppresses CMAS infiltration,while the introduction of larger-radius RE^(3+)ions promotes Ca^(2+)depletion in the CMAS melt,reducing its corrosive activity.A temperaturedependent transition in corrosion mechanisms is also elucidated.Thermodynamic-kinetic competition dominates at 1300℃,whereas a dissolution-reprecipitation mechanism prevails at 1500℃due to accelerated ion diffusion.Furthermore,an innovative extended Kalman filter(EKF)model is developed,enabling highly accurate prediction of the long-term corrosion depth and rate at 1300℃,with an error of less than 3%.The experimental results demonstrate that both materials exhibit exceptional CMAS corrosion resistance,reducing the corrosion depth by approximately 70%compared with single-component RE2Si_(2)O_(7).This work not only clarifies the corrosion mechanisms and compositional design principles of high-entropy rare-earth disilicates but also provides a novel methodology for predictive lifetime assessment,advancing the development of next-generation T/EBC systems.
Yun Fan;Yuelei Bai;Xiaodong He;Dong Chen;Zhaoxu Sun;Zhiyao Lu;Yuchen Liu;Bin Liu
National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and Structure,Harbin Institute of Technology,Harbin 150080,China School of Materials Science and Engineering,Shanghai University,Shanghai 200444,ChinaNational Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and Structure,Harbin Institute of Technology,Harbin 150080,ChinaNational Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and Structure,Harbin Institute of Technology,Harbin 150080,ChinaSchool of Electronics and Information Engineering,Harbin Institute of Technology,Harbin 150080,ChinaNational Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and Structure,Harbin Institute of Technology,Harbin 150080,ChinaNational Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and Structure,Harbin Institute of Technology,Harbin 150080,ChinaCollege of Sciences,Nanjing Agricultural University,Nanjing 210095,ChinaSchool of Materials Science and Engineering,Shanghai University,Shanghai 200444,China Institute of Coating Technology for Hydrogen Gas Turbines,Liaoning Academy of Materials,Shenyang 110004,China
通用工业技术
high entropyrare-earth disilicateenvironmental barrier coatingextended Kalman filtercalcium-magnesium-aluminosilicate resistance
《Journal of Advanced Ceramics》 2026 (3)
P.111-125,15
supported by the National Natural Science Foundation of China(Nos.U21A2063,52172071,and 51972080)support from Shanghai Technical Service Center for Advanced Ceramics Structure Design and Precision Manufacturing(No.20DZ2294000).
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