Page 50 - May

NEW TECHNOLOGY

Fig. 9. Complex of the main equipment for microplasma spraying (block equipment, plasmatron, powder dispenser) and the
type of plasma jet during spraying.

The microplasma spraying process is a precision technology that requires the application of
functional coatings to local areas. Implemented coating properties: wear resistance, antifriction,
heat resistance, heat resistance, erosion resistance, fretting resistance, cavitation resistance,
corrosion resistance, dielectricity, absorption and reflection of radiation, etc. For example, this
process is used to improve the quality, reliability and durability of dentures and fixed crowns in
dentistry. At the same time, coatings are applied to stamped and cast prostheses, which provide
an increase in the roughness parameters and, accordingly, the area of the contact surface with
the subsequent facing material - plastic, light-cured composite materials or ceramics (porcelain,
sitall). In this case, the adhesion of the facing materials to the base increases by 3 - 5 times
compared to traditional abrasive blasting, increased resistance to breaking loads.
Titanium or metals and alloys close in chemical composition to the base material are
used as powder materials for microplasma spraying. The thickness of these coatings is 50
- 100 microns. In order to ensure localization of the arc discharge plasma, a plasmatron for
microplasma treatment and equipment for its operation have been developed (Fig. 10, Table
3). Its purpose is plasma activation, purification, bacteriostatic and bactericidal treatment,
dissection of biological tissues, coagulation of blood vessels, therapeutic and non-traditional
methods of treatment. The composition of the installation - a block of equipment combined
with a power source and a cooling system, a microplasmatron with a set of handpieces, a
remote control pedal.

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