等离子喷涂ZrO_2热障涂层工艺参数优化设计

Process Optimization of ZrO_2 Thermal Barrier Coating by Plasma Spraying

为了深入研究等离子喷涂ZrO2粒子的飞行特征与涂层性能之间的关系,采用三水平四因素正交试验法对主气、辅气、电流及喷涂距离等4个主要参数进行了优化设计,并采用DPV2000热喷涂在线监测仪测定了ZrO2粒子的飞行特征参数,通过IA32定量金相分析软件对涂层的孔隙率进行了测试。结果表明,影响ZrO2粒子温度的主要因素为主气和辅气,影响ZrO2粒子飞行速度的主要因素为喷涂距离和辅气。

In this study, the influence of flight characteristics of ZrO2 particles during plasma spraying on the microstructure of the coatings was investigated. Four main process parameters controlling the quality of ZrO2 coatings were optimized by orthogonal experiment design. For each sprayed coating, the particle velocity and particle temperature were measured by a DPV2000 model in-flight particle sensor for thermal spraying. The microstructure of coatings and their porosity were analyzed by a IA32 model quantitative microscope. The results showed that the flow of argon and helium are more important parameters influencing the ZrO2 particle temperature than the spraying distance and current. The factors influencing flying velocity of ZrO2 particle is mostly spraying distance and flow of helium.