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高温材料处理:国际期刊

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ISSN 打印: 1093-3611

ISSN 在线: 1940-4360

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EFFECT OF FLUCTUATIONS OF DC CURRENT ON PROPERTIES OF PLASMA JET GENERATED IN PLASMA SPRAYING TORCH WITH GERDIEN ARC

卷 13, 册 2, 2009, pp. 229-240
DOI: 10.1615/HighTempMatProc.v13.i2.110
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摘要

Two different power supplies used for dc arc plasma spraying unit with water stabilized plasma torch were compared - classical thyristor controlled unit with the frequency of the current ripple 300 Hz and the rectifier with the high frequency converter and frequency of the current modulation 30 kHz. For the both types of power supply the arc characteristics were measured, time averaged plasma jet properties were determined from spectroscopic measurements and plasma jet fluctuations were analysed on the basis of diagnostics with an array of high frequency photodiodes. The properties of coatings sprayed with the two power supplies were compared. While time averaged profiles of plasma jet were the same for the both power supplies, the fluctuations of plasma jet differed substantially. Also the dynamic arc voltage characteristics of the arc were different and could be described by modified Cassie equation. The differences of properties of TiO coatings deposited with the use of the two power supplies were not significant.

对本文的引用
  1. Kopecky V., Hrabovsky M., Resonant Excitation of Boundary Layer Instability of DC Arc Plasma Jet by Current Modulation, Plasma Chemistry and Plasma Processing, 31, 6, 2011. Crossref

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