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Improvement of plasma spray torch stability by controlling pressure and voltage dynamic coupling

Vincent Rat 1 Jean-François Coudert 1
1 Axe 2 : procédés de traitements de surface
SPCTS - Science des Procédés Céramiques et de Traitements de Surface
Abstract : The development of coating formation processes involving electric arcs depends on process stability and the capacity to ensure a constant reproducibility of coating properties. This is particularly important when considering suspension plasma spraying or solution precursor plasma spraying. Submicron particles closely follow plasma instabilities and have nonhomogeneous plasma treatment. Recently, it has been shown that arc voltage fluctuations in direct-current (dc) plasma torches, showing dominant fluctuation frequencies between 4 and 6 kHz, are linked to pressure oscillations in the cathode cavity of the plasma torch. In this study, first, a method to isolate the different oscillation modes in arc voltage and pressure signals using signal processing methods is presented. Second, correlations between the different modes of oscillations are analyzed following the plasma torch operating parameters. Lastly, it is shown that the use of an acoustic stub, mounted on the torch body, decreases the amplitude of arc voltage fluctuations and slightly increases the mean voltage.
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https://hal.archives-ouvertes.fr/hal-00569208
Contributor : Martine Segear Connect in order to contact the contributor
Submitted on : Thursday, February 24, 2011 - 3:04:48 PM
Last modification on : Wednesday, December 15, 2021 - 9:59:31 AM

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Vincent Rat, Jean-François Coudert. Improvement of plasma spray torch stability by controlling pressure and voltage dynamic coupling. Journal of Thermal Spray Technology, ASM International/Springer, 2011, 20, pp.28-38. ⟨10.1007/s11666-010-9555-3⟩. ⟨hal-00569208⟩

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