Constant Hydrogen Flow Rate Research Articles

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

Abstract 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.