Особливості аналізу фізико-хімічних процесів руху та нагрівання часток у потоці плазми під час відновлення контактних вузлів

Authors

  • І. П. Радько

Abstract

UDC 621.31

ANALYSIS OF PHYSICAL AND CHEMICAL PROCESSES OF MOTION AND HEATING PLASMA PARTICLE FLOW IN CONTACT WITH RESTORATION UNITS

I. Radko

 

The purpose of research - to identify process changes the chemical composition of sprayed material due to thermal expansion, the interaction between particles with elements of the environment, as well as interaction in the volume of shares in case dusting powder henerohennyh contact materials and morphological changes in the sprayed material phenomena due to the melting puffs, contact and destruction of particles in a closed gas stream.

Results. Learn about the importance of thermal and kinetic energy of the particle, its size, shape and chemical composition are needed in the analysis of the formation of the coating. To justify the choice of certain common patterns and mathematical relationships obtained in the theory of two-phase flow characteristics necessary assembly plasma jet in terms of the conditions of gas flow and its interaction with dispersed component. First of all, it refers to the value of the Reynolds number (Re). Estimated assessment shows that the conditions for a variety of spraying value Re is within 0.5 - 22 (laminar flow regime of gas).

Based on the assumption that the proportion of powder reacts with unisothermal flooded jet of plasma, which has a radial and axial gradients of temperature and velocity can be assessed forces that interact to it.

Estimated estimate of the magnitude of these forces shows that if the first one is 50x10-3 N, the power Basse and Magnus are at about 3 10-3 H and 2 10-3 Н, respectively, and the rest - 10-3 ... 10 -5N.

In forming a plasma sprayed coating material in addition to participating directly base (material kontaktotrymacha device).

Thus, the step of forming coating is a complex of different kinds of phenomena that affect coverage for the desired level of properties.

Under the current provisions, all the interaction of particles sprayed surface can present composed of three stages: the formation of physical contact; activation of the contact surfaces and form chemical atomic bonds at the interface; development of interaction volume (mikronapruhy relaxation, recrystallization, heterodiffusion, the formation of new phases).

Conclusions

Analysis of current thoughts on the interaction of particles sprayed with the base leads to the following conclusions:

1. Chemical interactions between particles and sprayed basis largely determines the adhesion of coatings progra. The kinetics of this reaction is limited by the stage of activation of the base.

2. Existing information on the adhesion of coatings progra not adequately reflect the basic laws of the formation of compound materials when spraying, incidentally, discrete chemical interaction, activating effect of pretreatment framework, the role of the surrounding gas environment and so on.

3. There is no quantitative estimates of the impact of the base state - dislocation structure, voltage presence films, etc. - on the strength of adhesion coatings.

Combining in-depth theoretical analysis of various phenomena occurring in plasma spraying contact details of methods of regression analysis is, in our opinion, the most appropriate way to study these processes.

References

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Буткевич Г. В. Дуговые процессы при коммутации электрических цепей / Г. В. Буткевич. – М. : Энергия, 1973. – 172 с.

Радько ?. П. Диффузия электроконтактных материалов при коммутации тока / ?. П. Радько // Електрифікація та автоматизація сільського господарства. – 2005. – № 2.

Электрические контакты: Труды совещания (11–14 декабря 1982 г.) / отв. редактор Б. С. Сотсков. – М. : Энергия, 1983. – 680 с.

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Published

2017-02-24

Issue

No. 242 (2016)

Section

Статті

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