Ultrasonic Plasma Spray--A New Plasma Spray Process

WEN Xiong-wei¹，LI Lu-ming¹，ZHANG Hua-tang¹，LU Zhi-qing¹

(1.Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China)

摘要:The method of arc- ultrasonic is introduced into plasma spray process. The process of spray ZrO2-NiCoCr AlY thermal barrier coatings (TBCs) using air plasma spray (APS) process is studied. A exciting source which can be adjusted from audio frequency to several hundred thousand Hertz is designed successfully. The ultrasonic exciting source is coupled with conventional DC spraying power supply. A few ultrasonic frequencies are selected in the testing. Several parts of the coatings with the coupling arc- ultrasonic are compared with the coatings without it. The results show: with 50 kHz and 80 kHz ultrasound, the coating qualities are improved, whereas 30 kHz has an opposite effect.

关键词:plasma spray; arc- ultrasonic; thermal barrier coating; morphology;

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