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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Duan, Z. Wittmann, K. Heberlein, J. Coudert, J.F. Fauchais, P. |
| Copyright Year | 1999 |
| Description | Author affiliation: Minnesota Univ., Minneapolis, MN, USA (Duan, Z.) |
| Abstract | Summary form only given. An uncontrolled plasma instability is a phenomenon that most processes try to avoid. In plasma spraying, such an instability can lead to a deterioration of the coating quality. In our investigation, the voltage fluctuations of a subsonic DC plasma torch have been analyzed and correlated with appearance of plasma jet instabilities. The torch has a straight bore anode nozzle and a button shape cathode. The arc gas can be injected forming either a straight flow or a swirling flow. Three are operating modes have been found: the "restrike" mode which is characterized by a saw-tooth shape voltage waveform and a large fluctuating amplitude, the "take-over" mode which is represented with a more or less sinusoidal or triangle shape waveform with a varying amplitude, and the "steady" mode which shows a nearly flat voltage profile with a low mean voltage. In addition to the analysis of the voltage waveform, analysis of high speed video images obtained from end-on observation of the arc in the anode nozzle has been used as diagnostics. |
| File Size | 127657 |
| File Format | |
| ISBN | 0780352246 |
| ISSN | 07309244 |
| DOI | 10.1109/PLASMA.1999.829477 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1999-06-24 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Shape Anodes Image analysis Thermal spraying Coatings Voltage fluctuations Plasma waves Boring Cathodes Low voltage |
| Content Type | Text |
| Resource Type | Article |
| Subject | Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering |
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