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Home Physics Electrolytic Plasma Thermocycling Treatment (EPTT)

Electrolytic Plasma Thermocycling Treatment (EPTT)


EPTT is performed by means of electric discharges in the plasma layer between the workpiece surface and electrolytic electrode. The plasma material is a water-based electrolyte. This electrolyte is used also for cooling of the heated surface. Treatment can be performed with several heaters at a time to raise the process productivity.

Thermal-cycling surface treatment is performed with the electric current commutated by electrolyte (aqueous solution of alkali). Alloying elements (metal ions) are added to the electrolyte and participate in the diffusion process of alloying of the heated surface of a part. Cooling of the surface is provided by the electrolyte and due to heat capacity of the part.

Cycling of the heating and solidification processes enhances diffusion and provides formation of a microcrystalline structure in the surface layer.

Innovative Aspect and Main Advantages

We use ingenious electrolytic-plasma devices (Fig. 1) operating on the basis of utilization of a liquid electrode, i.e. electrolyte, formation of a plasma layer on the part surface and generation of energy in this layer in the form of electric discharges.

This provides thermal-cycling heating, alloying and structuring of the surface of metal parts to a depth of 0.1-10 mm. The technology is environmentally clean since EPTT process accompanied by emission of water vapors only. The power utilization efficiency of 80-90 % makes this technology power-saving.

The non-contact temperature sensor and control system provide automation of the technology and thermal cycling of the surface of parts in a range of preset temperatures.

Areas of Application

This technology is efficient both for abrasive wear protection of the surface of parts and for producing of a hardening layer on parts of the type of hydraulic rods, deformation rollers and rolling mill rolls.

The technology is effectively applied in mining engineering, metallurgy, agriculture and wood working industry. Main advantages of the technology are a multiple energy saving, improvement of physical-operating properties of the working layer and, therefore, performance of metal parts operating under wear and complex stress conditions.

Basic grounds for application of this technology are:

  • high energy density in treatment zone and possibility to regulate it smoothly;
  • short-time and locality of treatment limiting the zone of thermal treatment;
  • simplicity of plasma jet generation and possibility to realize treatment of complex surfaces without contact;

The possibility of automation of treatment process.

Fig. 1 Devices for hardening of cylindrical parts:
a) mounted on part; b) for hardening saw,
v) for hardening roller, g) device fixed on manipulator.

Fig. 2 Devices for hardening of heavy crankshaft.

Stage of Development

The technology and equipment are commercially applied for hardening of surfaces of various parts.

For example, the technology used for hardening of drill pipes (rods), large crankshafts (Fig.2), saws and knives provided a 2-3 times increase in their performance and a 3-5 times decrease in power consumed for their manufacture.

Novelty of the technology and equipment is covered by dozens of the USSR Author’s Certificates and Russian patents.

Contact Details

Tyurin Yuri
Organization: E.O. Paton Electric Welding Institute, National Academy of Sciences of Ukraine
Address: 11, Bozhenko St., Kiev 03680, Ukraine
+38044 - 289 09 14, Fax: +38044 - 271 20 34
Mob. tel: +38066 303 61 96
This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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