**Author details**

(at temperatures above 150°C), a monotonous increase in conductivity begins, caused by the thermal activation of charge carriers from energy levels of 0.63 eV and 0.35 eV, respectively. The electrical conductivity of TiO2 coatings decreases from 4 <sup>10</sup><sup>8</sup> Ohm<sup>1</sup> <sup>m</sup><sup>1</sup> to 1 <sup>10</sup><sup>10</sup> Ohm<sup>1</sup> <sup>m</sup><sup>1</sup> with increasing temperature from room temperature to 250°C and increases to 1 <sup>10</sup><sup>7</sup> Ohm<sup>1</sup> <sup>m</sup><sup>1</sup> with

*AFM surface microtopography of the dielectric layers (a) MgO, (b) TiO2, and (c) Al2O3 [2].*

As can be seen from the temperature dependences of the electrical conductivity of the dielectric layers for an alternating current case, in all investigated coating systems with increasing frequency, the magnitude of the electrical conductivity increases linearly. The increase in *σ*(*ω*) is due to the delay of slow polarization mechanisms. Moreover, the exponent *n* in the equation *σ*(*ω*) = *ω<sup>n</sup>* for the studied materials differs: for the Al2O3 layers *n* = 0.2, whereas for MgO *n* = 0.5. For titanium

Thus, the peculiarities of formation of the structure, adhesive, micromechanical,

obtained by ion-plasma sputtering were established. An optimal mode of formation of Al2O3, TiO2, and MgO dielectric layers was also determined: the gas pressure in the range <sup>Р</sup> = (1.5–4) <sup>10</sup><sup>2</sup> mmHg, the arc current in the range I = 30–40 A, the

When selecting the material for the substrate and dielectric layer during the design of a film heating element, it is necessary to evaluate the type and order of

The existing methods for producing insulating coatings on the surface of corrosion-resistant steels are analyzed. It is shown that the CVD methods (ionplasma deposition of metal oxide metal) of deposition on stainless steel substrates

and electrophysical properties of the Al2O3, TiO2, and MgO dielectric layers

displacement potential on substrate Е = 60 V, and the time τ = 20 min.

values of the dielectric losses that occur under operating conditions.

increasing temperature up to 400°C [2].

*Engineering Steels and High Entropy-Alloys*

oxide coatings, it increases to 0.9.

**4. Conclusion**

**76**

**Figure 19.**

Zoia Duriagina1,2\*, Taras Kovbasyuk1 , Volodymyr Kulyk<sup>1</sup> , Andriy Trostianchyn<sup>1</sup> and Tetiana Tepla1

1 Lviv Polytechnic National University, Lviv, Ukraine

2 John Paul II Catholic University of Lublin, Lublin, Poland

\*Address all correspondence to: zduriagina@ukr.net

© 2020 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
