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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。
The nanostructured coatings were prepared by supersonic plasma spraying (SAPS). The flying velocity and surface temperature of the molten particles in the plasma jet were measured by Spray Watch-2i. The microstructure was characterized by scanning electron microscopy (SEM) and transmission electron microscopy Hardness and fracture toughness. The insulation temperature was measured by self-made thermal insulation test platform to study the influence of the melting state of the flying particles on the microstructure and properties of nanostructured coatings. The results show that the particle temperature velocity of YSZ nano-coating is divided into three regions: SAPS High T-V, SAPS Medium T-V and SAPS Low T-V. The unmelted particles of nano-coating decrease with the increase of melt index, while the adiabatic temperature decreases with the increase of melt index. When the unmelted particles and the content of the pores increase, the microhardness decreases. The medium-temperature and medium-speed coating has the highest fracture toughness and good comprehensive properties. The three regions of the nano-coating after service unmelted particles and porosity are reduced, the insulation temperature is also reduced.