超音速等离子喷涂粒子飞行特性对纳米YSZ涂层性能的影响  

Effect of particle in-flight characteristics during supersonic atmospheric plasma spraying on properties of nanostructured YSZ coatings

作　　者：付倩倩[1] 通雁鹏 赵海燕[1] 

机构地区：[1]山西大同大学机电工程学院,中国大同037000

出　　处：《金属热处理》2017年第8期135-141,共7页Heat Treatment of Metals

摘　　要：采用超音速等离子喷涂(SAPS)制备不同工艺条件下的纳米结构涂层,用Spray Watch-2i在线测试等离子射流中熔融粒子飞行速度及表面温度,用扫描电镜及透射电镜表征微观结构,测量显微硬度、断裂韧性,用自制隔热试验平台测量隔热温度,研究飞行粒子熔化状态对纳米结构涂层组织及性能的影响。结果表明YSZ纳米涂层粒子温度速度分为三个区域:高温高速区(SAPS High T-V),中温中速区(SAPS Medium T-V),低温低速区(SAPS Low T-V)。纳米涂层未熔颗粒随熔融指数增加而减少,隔热温度随熔融指数增加而降低。涂层未熔颗粒和孔隙含量增加时,显微硬度降低;中温中速区域涂层断裂韧性最高,有良好的综合性能。三个区域的纳米涂层服役后未熔颗粒和孔隙率都有所降低,隔热温度也降低。Effect of particle in-flight behavior on the microstructure and properties of nanostructured YSZ coating deposited by supersonic atmospheric plasma spray was investigated. A commercially available online diagnostic system（ Spray Watch-2i） was applied to measure the velocity and surface temperature of in-flight particles. Scanning electron microscope and transmission electron microscope were used to characterize the microstructure. Hardness and fracture toughness were also measured. Furthermore,an insulation set-up was built to measure the insulation temperature of the as-sprayed coatings and the coatings after service in high temperature. The results show that for nanostructured coatings,the surface temperature and the velocity are divided into three regions： High T-V,Medium T-V and Low T-V. With the decrease of melting index of in-flight particles,the content of non-molten particles increases and the insulation temperature also increases.Increasing non-molten particles results in reduction of hardness. However,the fracture toughness of the Medium T-V coating is the highest.The Medium T-V coating exhibits excellent comprehensive properties. For the three kinds of coatings,the contents of non-molten particles and porosity are both reduced after service. The insulation temperatures are also reduced.

关 键 词：等离子喷涂 粒子特性 组织结构 隔热效果 力学性能 

分 类 号：TG174[金属学及工艺—金属表面处理]