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Evaluation of hillock-like deposition behaviour of HVOF thermal spray coatings using rotary shutter procedure

机译:使用旋转百叶窗程序评估HVOF热喷涂涂层的小丘样沉积行为

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Evaluation of hillock-like deposition behaviour of WC/Co coatings was performed using a rotary shutter procedure coupled with 100 passes of high velocity oxy fuel thermal spraying. During the spraying procedure, a DPV 2000 in situ diagnostic instrument was used to monitor the temperature and velocity of inflight particles. The microstructure of the coatings was analysed using an optical microscope to monitor the porosity and thickness distributions at various positions of the hillock-like coatings. A 7·1% porosity was observed at the centre of the hillock-like coatings, and a 10% porosity was observed at the edge, each at a spraying distance of 200 mm. The centre area of hillock-like coatings exhibited almost a 30% decrease in porosity compared to the edge area. The results indicate a higher quality structure at the centre area of the hillock-like coatings.
机译:WC / Co涂层的小丘样沉积行为的评估是使用旋转百叶窗程序与100次高速氧燃料热喷涂相结合进行的。在喷涂过程中,使用了DPV 2000原位诊断仪来监测飞行中粒子的温度和速度。使用光学显微镜分析涂层的微观结构,以监测小丘状涂层不同位置的孔隙率和厚度分布。在小丘状涂层的中心观察到孔隙率为7·1%,在边缘处观察到孔隙率为10%,每次喷涂距离为200 mm。与边缘区域相比,小丘状涂层的中心区域的孔隙率降低了近30%。结果表明在小丘状涂层的中心区域具有更高质量的结构。

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