无机材料学报2025，Vol.40Issue(4)：425-432,8.DOI:10.15541/jim20240411
Yb2O3改性硅黏结层的环境障涂层体系耐高温水氧腐蚀行为研究
High-temperature Water Vapor Corrosion Behaviors of Environmental Barrier Coatings with Yb2O3-modified Silicon Bond Layer
摘要
Abstract
Rare earth silicate environmental barrier coatings(EBCs)are important materials that can be applied to hot sections for the new generation of high thrust-to-weight ratio aero engines.However,oxidation and cracking of the silicon bond layer are significant factors leading to failure during service.Modifying the silicon bond layer has become an important method to extend EBCs' service life.In this work,Yb2O3 was doped in the silicon bond layer to mitigate cracking under high-temperature water vapor conditions,as well as to improve its corrosion resistance.Five kinds of EBC systems(Si-Yb2O3)/Yb2Si2O7/Yb2SiO5 with different Yb2O3 doping(0,5％,10％,15％,20％,in volume)were prepared on SiC substrates using vacuum plasma spraying technology.Their water-oxygen corrosion behavior was studied,and mechanisms at 1350℃ beneath their behavior were revealed.The results indicated that doping an appropriate amount(5％)of Yb2O3 into silicon effectively facilitates the reaction with SiO2 and its subsequent consumption during high-temperature water vapor corrosion.This process reduces the stress variations associated with SiO2 phase transition(β→α)and inhibits formation of longitudinal cracks in mixed thermal growth oxide(mTGO)layer,thus enhancing structural stability.Furthermore,the reaction product of Yb2Si2O7 exhibits a suitable coefficient of thermal expansion(CTE)and chemical compatibility.Notably,increasing Yb2O3 content results in formation of interconnected"skeleton"structure within the bond layer,which may provide a direct pathway for oxidizing substances to permeate into the interior of coating,thereby facilitating corrosion process within the bond layer,and ultimately diminishing the water vapor corrosion resistance of EBC systems.关键词
环境障涂层/水氧腐蚀/黏结层改性/真空等离子喷涂Key words
environmental barrier coating/water vapor corrosion/modified bond layer/vacuum plasma spray分类
化学工程引用本文复制引用
梁锐辉,钟鑫,洪督,黄利平,牛亚然,郑学斌..Yb2O3改性硅黏结层的环境障涂层体系耐高温水氧腐蚀行为研究[J].无机材料学报,2025,40(4):425-432,8.基金项目
国家自然科学基金(52202075)National Natural Science Foundation of China(52202075) （52202075）
