Modelling and diagnostics of multiple cathodes plasma torch system for plasma spraying

doi:10.1007/s11465-011-0125-2

Front Mech Eng

2011, Vol. 6

Issue (3) : 324-331 https://doi.org/10.1007/s11465-011-0125-2

RESEARCH ARTICLE

Modelling and diagnostics of multiple cathodes plasma torch system for plasma spraying

Kirsten BOBZIN¹, Nazlim BAGCIVAN¹, Lidong ZHAO¹, Ivica PETKOVIC¹(

), Jochen SCHEIN², Karsten HARTZ-BEHREND², Stefan KIRNER², José-Luis MARQUéS², Günter FORSTER²

1. Surface Engineering Institute, RWTH Aachen University, 52072 Aachen, Germany; 2. Institute of Plasma Technology and Mathematics, Universit?t der Bundeswehr München, Neubiberg, Germany

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Abstract

Usage of a multiple-arcs system has significantly improved process stability and coating properties in air plasma spraying. However, there are still demands on understanding and controlling the physical process to determine process conditions for reproducible coating quality and homogeneity of coating microstructure. The main goal of this work is the application of numerical simulation for the prediction of the temperature profiles at the torch outlet for real process conditions. Behaviour of the gas flow and electric arcs were described in a three-dimensional numerical model. The calculated results showed the characteristic triangular temperature distribution at the torch nozzle outlet caused by three electric arcs. These results were compared with experimentally determined temperature distributions, which were obtained with specially developed computed tomography equipment for reconstructing the emissivity and temperature distribution of the plasma jet close to the torch exit. The calculated results related to temperature values and contours were verified for the most process parameters with experimental ones.

Keywords plasma spraying electric arc three-cathode plasma torch numerical simulation computed tomography

Corresponding Author(s): PETKOVIC Ivica,Email:petkovic@iot.rwth-aachen.de

Issue Date: 05 September 2011

Cite this article:

Kirsten BOBZIN,Nazlim BAGCIVAN,Lidong ZHAO, et al. Modelling and diagnostics of multiple cathodes plasma torch system for plasma spraying[J]. Front Mech Eng, 2011, 6(3): 324-331.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-011-0125-2
https://academic.hep.com.cn/fme/EN/Y2011/V6/I3/324

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