Advanced Lightweight Steels

**Chapter 4**

**Abstract**

stainless steel substrate

nitrides, and other phases.

and deterioration of the properties.

**57**

**1. Introduction**

Technologies of

High-Temperature Insulating

*Zoia Duriagina,Taras Kovbasyuk, Volodymyr Kulyk,*

**Keywords:** insulating coatings, glass-ceramic coatings, oxide materials,

For the use of chromium steels in instrumentation, microelectronics, and electrical engineering, their surfaces are additionally protected by coatings based on glass ceramics and other insulating materials. Such materials can operate at high temperatures for a long time under the influence of the electric current or magnetic field. This chapter describes the research results on synthesized coatings based on oxide glass ceramics and oxide materials obtained by plasma chemical vapor depo-

It is known that the corrosion-mechanical and functional properties of steels can be improved by alloying elements with a more negative electrode potential (chromium, silicon, aluminum) or elements with a higher potential than iron (e.g., copper, molybdenum, nickel) or elements that promote the formation of carbides,

The second way (which can occur simultaneously with the first) is to use various methods of surface engineering, in particular, the formation of a dense oxide film, which protects the surface of the alloy from oxidation and dissolution or acts as a functional coating, e.g., a dielectric one. To do this, you need to have the appropriate concentration of the alloying element. To ensure the proper level of functional properties, such coatings must be without defects, with high adhesion to the surface and minimal difference in thermal expansion coefficients as compared to the stainless steel substrate. The condition of formation of such coatings is a certain ratio of the volumes of oxide (VMеО) and the oxidizing metal (VMе): VMеО/VM<sup>е</sup> > 1. Under such a condition, as a rule, coatings are formed that improve the functional properties of the metal and slow down both the degradation process of its microstructure

As is known, stainless steels are obtained by introducing into the composition of low- and medium-carbon steels at least 12.5% chromium as well as nickel and other alloying elements (titanium, aluminum, molybdenum, niobium, copper, manganese). Depending on the structure, austenitic (AISI 302, 347, 316L, 316, 316Ti, and

Coatings on Stainless Steels

*Andriy Trostianchyn and Tetiana Tepla*

sition (CVD) on the surfaces of stainless steels.

**Chapter 4**
