请登录 0 购物车
首页 图书 电子图书 期刊 参考文献及会议录 作者,编辑,审稿 A-Z 产品目录
Progress in Plasma Processing of Materials, 1999

ISBN 打印: 1-56700-126-2

INFLUENCE OF PLASMA SPRAY OPERATING PARAMETERS ON ARC FLUCTUATIONS

Abstract

Arc voltage fluctuations in D.C. plasma spray torches result from the movement of the arc attachment inside the anode nozzle. These fluctuations express the variation of the arc length and the power dissipation and strongly influence torch performance and coating quality.
In this study, two torches with swirl or straight injection of the plasma gas have been investigated. To characterize the arc instability, voltage fluctuations and acoustic emissions from the plasma jet have been recorded and analyzed on line using a workstation operating with LabView environment. The length and the stability of the jet have been quantified in terms of jet centreline deviation from the torch axis (JetRMS) using a video system. Different arc currents, nozzle diameters, Ar/H2 plasma gas flow rates have been examined.
A good correlation has been found between the frequency of the voltage and acoustic signals. This study has allowed to compare the dominant values of the frequencies according to the type of plasma gas injection and the different operating parameters. Thus an arc current and plasma gas flow rate increase and a nozzle diameter decrease lead to an higher restrike mode frequencies.
首页 Begell Digital Portal Begell数据库 期刊 图书 电子图书 参考文献及会议录 作者,编辑,审稿 A-Z 产品目录 订购及政策 关于BegellHouse 联系我们 Language English 中文 Русский 日本語 Português Deutsch Français Español