无机材料学报Issue(3)：287-293,7.DOI:10.15541/jim20140397
等离子喷涂-物理气相沉积7YSZ热障涂层沉积机理及其CMAS腐蚀失效机制
Deposition and CMAS Corrosion Mechanism of 7YSZ Thermal Barrier Coatings Prepared by Plasma Spray-Physical Vapor Deposition
摘要
Abstract
Using agglomerated and sintered ZrO2-7wt%Y2O3(7YSZ) powders as raw materials, columnar thermal barrier coatings (TBCs) were prepared by plasma spray-physical vapor deposition (PS-PVD) at substrate tempera-ture of 850℃ . The microstructures of columnar coating were analyzed byfield emission-scanning electron micro-scope (FE-SEM). Based on the theory of atoms together, the formation and growth process of 7YSZ nucleus were investigated and the deposition mechanism of columnar coating was also analyzed. Besides, under the temperature of 1200℃ , the CMAS (CaO-MgO-Al2O3-SiO2) corrosion of columnar 7YSZ coating was examined and its failure mechanism was also discussed. During the deposition process of columnar 7YSZ coating, the 7YSZ gas molecules were firstly absorbed on substrate, then through diffusion and migration, the critical nucleus formed rapidly. Besides, the critical nucleus further grew up forming crystal island by absorbing other molecules. Then after following four steps of island formation, union formation, channel formation and continuation, the columnar coating formed even-tually. When above melting temperature, the CMAS could penetrate into porous columnar coating by capillary force and react with the 7YSZ coating. Finally, the cracks appeared in the coating due to thermochemical and thermome-chanical interaction.关键词
等离子喷涂-物理气相沉积/沉积机理/CMAS腐蚀/腐蚀机制Key words
plasma spray-physical vapor deposition/deposition mechanism/CMAS corrosion/corrosion mechanism分类
化学化工引用本文复制引用
张小锋,周克崧,宋进兵,邓春明,牛少鹏,邓子谦..等离子喷涂-物理气相沉积7YSZ热障涂层沉积机理及其CMAS腐蚀失效机制[J].无机材料学报,2015,(3):287-293,7.基金项目
国家973计划(2012CB625100) （2012CB625100）
国家863计划(2012AA03A512)National Basic Research Program of China (2012CB625100) （2012AA03A512）
National High-tech Research and Development Program of China (2012AA03A512) （2012AA03A512）
