Improvement of plasma spraying efficiency and coating quality

被引:9
作者
Chen, HC
Pfender, E
Heberlein, J
机构
[1] ERC for Plasma-Aided Manufacturing, Department of Mechanical Engineering, University of Minnesota, Minneapolis
基金
美国国家科学基金会;
关键词
plasma spraying; torch modification; particle motion analysis; deposition efficiency; coating quality;
D O I
10.1007/BF02766824
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
A commercial torch has been modified to introduce an additional anti-vortex and shroud gas flow to counter the detrimental effects brought about by the vortex plasma gas flow which is used to stabilize the cathode are attachment and to increase the anode life. Deposition efficiency and coating quality are used as criteria to judge the modified versus the nonmodified torch. High-speed videography and computerized image analysis systems are used to determine the particle trajectories, velocities, and the plasma jet geometry. The results show that the additional anti-vortex and shroud gas flow to the torch can keep the particles closer to the torch axis and reduce the amount of entrainment of cold air into the plasma jet. The consequence is that deposition efficiency and coating quality are substantially improved.
引用
收藏
页码:93 / 105
页数:13
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