Effect of Fluctuations of DC Current on Properties of Plasma Jet Generated in Plasma Spraying Torch with Gerdien Arc

0330834 - ÚFP 2010 RIV US eng J - Journal Article
Hrabovský, Milan - Kopecký, Vladimír - Chumak, Oleksiy - Kavka, Tetyana - Mašláni, Alan - Sember, Viktor - Ctibor, Pavel
Effect of Fluctuations of DC Current on Properties of Plasma Jet Generated in Plasma Spraying Torch with Gerdien Arc.
High Temperature Materials and Processes. Roč. 13, č. 2 (2009), s. 229-240. ISSN 1093-3611
Institutional research plan: CEZ:AV0Z20430508
Keywords : Plasma torch * dc arc * plasma jet * fluctuations * plasma spraying
Subject RIV: BL - Plasma and Gas Discharge Physics
Impact factor: 0.333, year: 2009
http://www.begellhouse.com/journals/57d172397126f956,4e2a92412d8c6bb5.html

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 TiO2 coatings were not significant.
Permanent Link: http://hdl.handle.net/11104/0176525