大气等离子喷涂制备Yb_(2)Si_(2)O_(7)环境障涂层1350~1500℃水蒸气下的腐蚀行为  

Corrosion Behavior of Atmospheric Plasma Sprayed Yb_(2)Si_(2)O_(7) Environmental Barrier Coatings in Water Vapor at 1350–1500℃

作　　者：柯希嘉 王长亮 KE Xijia;WANG Changliang(AECC Beijing Institute of Aeronautical Materials,Beijing,Key Laboratory of Advanced Corrosion and Protection for Aviation Materials,Aero Engine Corporation of China,Beijing 100095,China)

机构地区：[1]中国航发北京航空材料研究院,中国航空发动机集团航空材料先进腐蚀与防护重点实验室,北京100095

出　　处：《硅酸盐学报》2024年第7期2341-2349,共9页Journal of The Chinese Ceramic Society

基　　金：中国科学技术协会“青年人才托举工程”项目(2023QNRC001)。

摘　　要：为了深入了解双硅酸镱(Yb_(2)Si_(2)O_(7))环境障涂层水蒸气腐蚀机理,采用大气等离子喷涂技术制备全包覆Si/Yb_(2)Si_(2)O_(7)双层环境障涂层,水蒸气腐蚀实验(1350~1500℃,90%H_(2)O/10%O_(2),体积分数,200 h)后对不同阶段和不同温度的样品进行表征以分析腐蚀行为和腐蚀机理。结果表明:在1350~1500℃范围内腐蚀200 h,Yb_(2)Si_(2)O_(7)层整体结构完整,热生长氧化物层生长速率较慢且符合线性增长,对Si C基体具有良好的保护作用,涂层没有发生剥落失效。在不同温度下,水蒸气腐蚀机理不同,不仅有SiO_(2)的挥发,还会发生“自修复”反应,同时Al(OH)_(3)的污染也会影响腐蚀行为。Introduction SiC-based ceramic matrix composites (SiC-CMCs) can meet both of these conditions for excellent high-temperature strength and oxidation resistance simultaneously,making them highly promising lightweight structural materials for future aerospace engine applications.Si dioxide generates volatile Si(OH)_(4) compounds when reacting with water molecules in the high-temperature environment of an engine in which there exists water and oxygen corrosion.With the progress of the reaction,the SiC substrate is continuously lost,resulting in a sharp decline in the physical and chemical properties of CMCs.Therefore,environmental barrier coatings (EBCs) are needed to be coated on the CMCs surface to prevent the materials from being damaged by corrosive media such as water vapor and improve the service life of SiC-CMCs.Si/Yb_(2)Si_(2)O_(7) EBCs is formed by a relatively mature controllable preparation method,and its resistance to water vapor corrosion is a key to the related research.Jian et al.found thatYb_(2)Si_(2)O_(7) coating had an excellent phase stability under the water vapor corrosion at 1300℃.The growth of thermally grown oxides (TGO) was effectively controlled.The oxidation weight gain rate of the coated sample was lower than that of the uncoated sample,thus indicating that Yb_(2)Si_(2)O_(7) topcoat could have an excellent corrosion resistance.Zhang et al.observed a“self-healing”reaction of Yb_(2)Si_(2)O_(7) topcoat in the water vapor corrosion at 1350℃,and the growth of the TGO layer showed a positive linear relationship with time,and the overall structure of the coating was basically intact.Ridley et al.reported that after Yb_(2)Si_(2)O_(7) topcoat was subjected to water vapor corrosion at 1400℃,a porous Yb_(2)SiO_(5) layer was formed,the thickness and pore size increased with time,and a distinct layered structure appeared in the reaction layers in the high-speed area,i.e.,a porous Yb_(2)SiO_(5) layer,a dense Yb_(2)SiO_(5) layer,and a highly porous Yb_(2)O_(3) layer.The existence of the dense l

关 键 词：双硅酸镱 环境障涂层 水蒸气腐蚀 等离子喷涂 

分 类 号：V254.2[一般工业技术—材料科学与工程]