纳米结构(Gd_(0.9)Yb_(0.1))_(2)Zr_(2)O_(7)/YSZ热障涂层热冲击性能研究  

Investigation of Thermal Shock Behavior of Nanostructured(Gd_(0.9)Yb_(0.1))_(2)Zr_(2)O_(7)/YSZ Thermal Barrier Coatings

作　　者：范薇 白宇[2] 王玉[2] Fan Wei;Bai Yu;Wang Yu(School of Energy and Power Engineering,North University of China,Taiyuan 030051,China;State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]中北大学能源动力工程学院,山西太原030051 [2]西安交通大学金属材料强度国家重点实验室,陕西西安710049

出　　处：《中国稀土学报》2023年第4期757-764,I0004,共9页Journal of the Chinese Society of Rare Earths

基　　金：国家科技重大专项(2019-Ⅶ-0007-0147)资助。

摘　　要：航空发动机的高推重比、高效率对热障涂层材料和结构提出了更高要求。利用同步双送粉系统制备了纳米(Gd_(0.9)Yb_(0.1))_(2)Zr_(2)O_(7)/YSZ双陶瓷层结构和准梯度复合结构的热障涂层,对其在1350~1400℃的火焰热冲击性能与失效机制进行了分析。结果表明:(Gd_(0.9)Yb_(0.1))_(2)Zr_(2)O_(7)(GYbZ)热障涂层显示出较好的高温相结构稳定性,其喷涂态与热冲击失效后都是单一的萤石结构;GYbZ/YSZ热障涂层是由纳米未熔颗粒和熔化结晶区组成的“双模式”结构;GYbZ/YSZ双层结构涂层的热冲击寿命为113次,GYbZ/YSZ准梯度结构涂层的热冲击寿命达到370次;双层结构涂层的剥落主要发生在GYbZ内部以及GYbZ与YSZ的层间界面,而准梯度结构涂层的剥落则发生在热生长氧化物(TGOs)附近的YSZ层内。准梯度结构和纳米“双模式”结构相结合是提高热障涂层高温使役性能的有效方法。The high thrust-to-weight ratio and high efficiency of aero-engines require developing new thermal barrier coatings materials and structures.Thermal barrier coatings with(Gd_(0.9)Yb_(0.1))_(2)Zr_(2)O_(7)/YSZ double-ceramic layer structure and quasi-gradient structure were prepared by synchronous dual powder feeding system.Their thermal shock properties and failure mechanism were analyzed at 1350-1400℃.The results show that(Gd_(0.9)Yb_(0.1))_(2)Zr_(2)O_(7)(GYbZ) thermal barrier coatings exhibit high phase stability at elevated temperature.The phase compositions of both the as-sprayed coatings and the failedones remain single fluorite structure.The GYbZ/YSZ thermal barrier coating presents a bimodal structure consisting of nano-sized unmelted particles and molten crystallization zone.The thermal shock life of GYbZ/YSZ double-layered structure is about 113 times,and that of GYbZ/YSZ quasi-gradient structure reaches 370 times.The spalling of the double-layered coating mainly occurs inside of GYbZ and/or at the interlayer between GYbZ and YSZ,while the spalling of the quasi-gradient coating occurs in the YSZ layer near the thermally grown oxides(TGOs).The combination of quasi-gradient structure and nano bimodal structure is an effective way to improve the thermal shock life of thermal barrier coatings.

关 键 词：热障涂层 纳米结构 准梯度结构涂层 热冲击性能 失效分析 稀土 

分 类 号：TB35[一般工业技术—材料科学与工程]