Page 43 - May

NEW TECHNOLOGY

The coating method is based on the use of a spark discharge with a short duration of its
existence 10-6≤tи≤10-3 s and the passage of powerful impulse currents during the discharge
of a capacitor with a current density of up to 106 A / mm2. The plasma temperature in the
interelectrode gap can reach 7000 - 11000 °C. As a result of thermal and the gas-dynamic effect
of a spark discharge, the erosion of the electrode (anode) material and the transfer of erosion
products in the liquid, solid and vapor phases to the product (cathode) occur. In this case, on
the surface of the product due to the course of metallurgical processes, a composite material is
formed, which contains electrode materials and products, products of their interaction with each
other and with elements of the interelectrode medium. An important factor in the high-quality
formation of the coating is the effect of cathodic cleaning, in which the destruction and removal
of surface films from the treated surface of the product (cathode) is ensured due to the high
density of the released energy in the microcathode spots of the spark discharge.

The main areas of application of this The main advantages of this technology
technology are: are:
● restoration and hardening of machine ● the possibility of local formation of coatings in
parts, tools, stamps; strictly specified places with a radius of fractions
● application of functional (wear-resistant, of a millimeter or more, without protecting the
electrically conductive, decorative) coatings; rest of the surface;
● reduction of the transient resistance of ● application of coatings on large and massive
electrical contacts (tin plating, tin plating, parts with local zones for tinning, tin plating,
nickel plating, silver plating). Hard alloys nickel plating, silver plating, etc.;
(T15K6, T17K12, VK6, VK8, VK20, etc.), ● high adhesion of the coating to the substrate;
materials based on metal carbides and ● lack of heating and deformation of the product
borides (TiC, WC, Mo2B5, CrB2, TaB2, etc.), during processing;
graphite and etc. ● the possibility of using various conductive
materials as electrodes, both from pure metals
and their alloys, powder materials, etc.
● comparative simplicity of the technology, which
does not require special preliminary surface
treatment;
● ease of maintenance and reliability of equipment,
which is small-sized and transportable;
● low energy consumption of manual and
mechanized processes (0.5 - 2.0 kW);

Stanochniy park 43