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Plasma Treatment of Disperse Material

#KR-1102


Physical Bases of Thermal Treatment of Disperse Material

Tech Area / Field

  • MAT-SYN/Materials Synthesis and Processing/Materials
  • PHY-PLS/Plasma Physics/Physics

Status
3 Approved without Funding

Registration date
17.11.2003

Leading Institute
Institute of Physics, Kyrgyzstan, Bishkek

Collaborators

  • Freie Universität Berlin / Institut für Chemie, Germany, Berlin\nUniversité de Limoges, France, Limoges\nLos-Alamos National Laboratory, USA, NM, Los-Alamos

Project summary

The thermal treatment of a disperse material in a plasma of electric arch underlies many modern plasma technologies. The technologies of protective coating with the help of microspheres fusion, the carrying out of the emission spectral analysis and some other technologies are related to the plasma technologies. In most variants of such technologies the small-disperse material is transported into the high-temperature zone of the electric arch by a cold gas stream with subsonic speeds. The flow rate of gas in such transporting stream should be rather small in order not to cool a plasma stream, the temperature of which should be controllable.

According to the principles of hydrodynamics, such subsonic streams flow around each other at the collision. Due to it, the disperse material, getting into the high-temperature zone of an arch, is irrationally small. It was repeatedly observed while attempting to introduce the aerosol or small-disperse material into the arch discharge.

One of variants of this problem solution is using the multi-jet electroarc equipment. In the place of plasma jets merge (technological area) the dispersed stream rather easily enters the discharge. Such method has been realized at the Institute of Physics of the National Academy of Sciences of the Kyrgyz Republic. Stable two-jet generators of plasma have been created and the specified technological processes have been realized. These works, carried out in the Kyrgyz Republic during many years, are widely known both in CIS and abroad.

The mentioned method has provided the certain progress. However, it has a number of lacks. The main one is that the high-temperature zone of an arch, adjoining to electrodes, remains outside the technological area of plasma. Thus, the share of the macroparticles, which have got into the plasma after the jets merge, does not exceed 40-50 %. In this connection it is necessary to find an optimum zone for introducing the aerosol or small-disperse material into the arc discharge that will allow increasing the maximal share of the material got into the plasma.


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