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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
ESCI SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Imprimer: 1093-3611
ISSN En ligne: 1940-4360

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

DOI: 10.1615/HighTempMatProc.v10.i4.30
pages 515-524

ELECTRIC PROBE INVESTIGATION OF ARC ANODE REGION IN PLASMA TORCH

O. Chumak
Thermal Plasma Department, Institute of Plasma Physics AS CR, Za Slovankou 3, 18200, Praha 8, Czech Republic
Milan Hrabovsky
Institute of Plasma Physics, Academy of Sciences Za Slovankou 3, 182 00, Prague
T. Kavka
Thermal Plasma Department, Institute of Plasma Physics AS CR, Za Slovankou 3, 18200, Praha 8, Czech Republic
Vladimir Kopecky
Thermal Plasma Department, Institute of Plasma Physics AS CR, Za Slovankou 3, 18200, Praha 8, Czech Republic

RÉSUMÉ

Electric probes were used for an investigation of an intermediate layer between an arc and an anode surface in a region around an anode attachment. Probe current and potential were measured for different positions. Resistance of the intermediate layer between anode surface and arc column and power dissipation in the layer were determined from the measurements. Anode attachment position on the anode surface was determined and compared to the results of the probe measurements. Measured currents on probes in the fringes of the arc column prove existence of a conductive layer between the arc column and the anode surface. Relatively high diffuse currents were found, flowing between the arc column and the anode in the positions upstream of the anode attachment. These currents may cause the heating of partially ionised gas in the layer between the anode and the arc column and subsequently can lead to formation of new anode attachment by thermal re-ignition.


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