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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

Impact factor: 0.058

ISSN Print: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v13.i2.110
pages 229-240

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

Milan Hrabovsky
Institute of Plasma Physics, Academy of Sciences Za Slovankou 3, 182 00, Prague
Vladimir Kopecky
Thermal Plasma Department, Institute of Plasma Physics AS CR, Za Slovankou 3, 18200, Praha 8, Czech Republic
O. Chumak
Thermal Plasma Department, Institute of Plasma Physics AS CR, Za Slovankou 3, 18200, Praha 8, Czech Republic
T. Kavka
Thermal Plasma Department, Institute of Plasma Physics AS CR, Za Slovankou 3, 18200, Praha 8, Czech Republic
A. Maslani
Institute of Plasma Physics AS CR, Za Slovankou 3 182 00 Prague 8
V. Sember
Institute of Plasma Physics, AS CR, Za Slovankou 3, P.O. Box 17, 182 21 Prague, Czech Republic
M. Konrad
TECOSIM Technische Simulation Gmbh Robert-Bosch-Str. 10, D-50769 Collogne, Germany; and Institute of Plasma Physics, Za Slovankou 3, 182 00, Praha 8, Czech Republic
P. Ctibor
Institute of Plasma Physics, Za Slovankou 3, 182 00, Praha 8, Czech Republic

ABSTRACT

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.