The analysis of the electrode conditions and performance of plasma torches EDP-104A in nitrogen plasma is carried out. It is shown that the life of the plasma torch is determined by the erosion of the tungsten thermal cathode. It is confirmed that the erosion depends on the strength of the current and the oxygen content in the plasma-forming gas. At the current strength of 1 kA with an increase in oxygen content from 0.1 to 0.5%, erosion increases from 10-12 to 10-9 kg/C. To reduce cathode erosion, it is necessary to limit the oxygen content in technical nitrogen.

Conditions of electrodeposition, the structure and physical-mechanical properties (microhardness, base cohesion, internal stresses, corrosion currents) of nickel-based galvanic composition coatings with nano and micropowders of titanium boride are investigated. It is determined that electrocrystallization of nickel in the presence of boride nanoparticles leads to the formation of coatings with small-sized structural fragments, low porosity and increased physical-mechanical properties. Titanium nanoboride is simultaneously a component of the composition coating and an effective modifier of the nickel matrix. The presence of nanoboride in the electrolyte improves its performance by increasing the allowable upper limit of the cathode current density.

Modeling and experimental studies of the electrodes erosion of plasma torch EDP-104A in nitrogen plasma were carried out. The resource of cathode and anode operation is determined by calculation. The conditions and performance of 178 cathodes were studied. The possibility of using natural gas to protect a tungsten cathode was investigated. The increase in the cathode life to the rated value was confirmed.

An integrated multifactor mathematical model of plasmosynthesis of titanium diboride was developed. The model includes 3 submodels: “Plasma generation”, “Evaporation of raw materials”, “Boride formation”. The model provides the implementation of multivariate research and engineering calculations of plasma processing technological indicators of various types of titanium-containing raw materials, industrial products and waste. The convergence of the predicted and practical results for various types of raw materials is 10.4-12.9%. In all cases, lower values of practical data are noted in comparison with the calculated ones, which is due to the influence of non-isothermal heat carrier gas.

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