Effect of hydrogen concentration in argon-hydrogen mixtures on parameters of electric arc in gas-vortex plasmatrons for diamond coating synthesis

Experiments have been performed to investigate the influence of hydrogen concentration in argon-hydrogen mixtures on arc discharge parameters of a gas-vortex plasmatron with gas-dynamic fixing of the arc length for synthesizing diamond coatings (DC) at different argon flow rates. A phenomenological...

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Bibliographic Details
Published in:Diamond and related materials 1998-06, Vol.7 (6), p.761-764
Main Authors: Vasil'ev, V.V., Zaleskij, D.Y., Samokhvalov, N.V., Strel'nitskij, V.E.
Format: Article
Language:English
Subjects:
Arc plasmatron
Argon-hydrogen mixture
Diamond coating
Exact sciences and technology
Optimal hydrogen concentration
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Plasma applications
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Summary:Experiments have been performed to investigate the influence of hydrogen concentration in argon-hydrogen mixtures on arc discharge parameters of a gas-vortex plasmatron with gas-dynamic fixing of the arc length for synthesizing diamond coatings (DC) at different argon flow rates. A phenomenological explanation is offered to account for the dependence of the arc voltage drop on hydrogen concentration in the argon-hydrogen mixture for fixed arc current and argon flow rate values. It is shown that increasing the argon flow rate at a constant hydrogen flow rate increases the specific enthalpy and the temperature of hydrogen. An experimental method of determining the optimum hydrogen concentration in the argon-hydrogen mixture of the arc discharge used for DC synthesis at different arc current values is proposed.
ISSN:0925-9635
1879-0062
DOI:10.1016/S0925-9635(97)00298-7