Khyzhniak V.G.

Physical and Chemical Conditions of Complex Saturation Carbon Steel 45 by Silicon and Chrome in Medium of Chlorine

The package of the applied programs with base of the thermodynamic data was used and the theoretical analysis of physical and chemical conditions of complex saturation carbon steel by silicon and chrome in medium of chlorine in the closed reactionary space was carried out at the lowered pressure of a gas phase. The influence of structure of initial components of a sating mix on equilibrium structure gas and condensed of phases of process chromosilicided is revealed.

Diffusion Coatings with the Participation of Titanium, Alumi¬nium and Silicon on Surface of the Steel 12X18H10T

Patterns of forming a multilayered diffusion coatings after complex saturation of titanium, aluminum and silicon to steel to improve heat resistance 12Cr18Ni10Ti were obtained and studied. The possibility of obtaining titanium-aluminum-silicon layers on steel 12Cr18Ni10Ti powder in containers with a gate in unpressurized conditions at temperature 1050 C and with duration 4 hours was studied. As initial components powders of titanium, aluminum, silicon, aluminum oxide, ammonium chloride were used.

Heat Resistance and Corrosion Resistance of Complex Chromium+Aluminum Diffusion Coatings on Titanium Alloy VT6

In this paper we study the microstructure, phase and chemical composition of complex chromium+aluminum diffusion coatings obtained by simultaneous saturation of titanium alloy VT6 with chromium and aluminum from powder mixtures. We discover that coatings consist of three separate layers of Al3Ti, AlTi, AlTi3 phases. The microhardness of diffusion multilayers in the area of Al3Ti phase is 7,1–9,0 GPa, of the main diffusion layer AlTi – 5,2–8,2 GPa and 11,0 GPa for the AlTi3 phase, that is by 2-4 times higher the microhardness of initial VT6 (3,63 GPa).

Corrosion of Steel Gas Chromoaluminized 12Х18Н10T

This paper presents the research results of chrome-calorizing of the steel 12X18Н10T. We show how to obtain chromo-calorizing coatings on the surface of the steel 12X18H10T with titanium nitride. We coat the surface by combining two processes: physical 12X18H10T vapor deposition of titanium nitride and diffusion chromo-calorizing conducted by powder in containers with fusible closure under reduced pressure at a temperature of 1050 °C for 3 hours. We determine the phase and chemical composition, thickness and microhardness of coatings before and after the heat resistance test.

Zirconium Nitring in a Closed Reaction Space

Currently there are methods for zirconium nitriding at high temperatures (1300-2000 C) and long-term exposure (up to 24 hours). This paper aims at developing a novel method of zirconium nitriding at lower temperature and exposure time, while maintaining such satisfactory mechanical properties as coating and matrix. Nitriding was conducted at 900 C for about 2 hours in an atmosphere of technically pure nitrogen. Samples were placed in the reaction chamber, which could provide the necessary degree of tightness and vacuum.

Diffusion coating with titan in aluminum and 12x18h10t nitrated steel

This study reveals the results of comprehensive treatment of 12X18H10T steel. We demonstrate the possibility of combining nitrating steel in the ammonia medium at a temperature 540 °С for 20 hours followed by titanium alumunizing relying on the powder method in containers with the consumable gate under the reduced pressure at a temperature 1050 °С for 0,5–6 hours. In addition, we examine the structure, phase and chemical composition of the obtained coatings. Finally, we describe the influence of nitrating on formation of the surface barrier layer of titanium nitride TiN.

The Corrosion Resistance of Chrome-calorized Steel 12Х18N10T

The paper under scrutiny presents the research results of chrome-calorized steel 12Х18N10T. Moreover, we demonstrate that it is possible to obtain complex chrome-calorized coating with titanium nitride TiN on the surface of the steel 12Х18N10T. To obtain this coating, we combine two processes: physical vapor deposition of titanium nitride and diffusion of chrome-calorizing conducted through the powder method in containers with fusible gate under reduced pressure at 1050 C for 3 hours. Hence we obtain the structure, phase and chemical composition of coatings.

Titanium aluminizing of technical iron in the closed reactionary space in the chlorine medium

Our study highlights physical and chemical conditions for titanium aluminizing of alloys in the closed reactionary space in the chlorine medium at low pressure. In addition, we+ show that simultaneous saturation of alloys by titanium and aluminum is possible in a wide range of saturated elements densities in the original mixture. Finally, we consider phase and chemical compositions, the structure of diffusion layers, formed on the technical iron after titanizing, nitriding with further titanizing, and titanium aluminizing.

Nitrogentitaning of steels and firm alloys

The research described in this paper considers the phase structure, structure, microhardness, thickness and wear resistance of protective carbide and nitride coverings, involving carbon and titan on steels and firm alloys. The research results demonstrate that the two-layer covering nitride of the titan–carbide of titan is formed on a surface of steels and firm alloys. Furthermore, our research results indicate that wear resistance of steel U8А with the carbide and nitride coverings has increased in comparison with the initial one by 3–4 times.

Abrasive wear resistance of composite diffusive coverages obtained by of the titan, vanadium, crome and aluminium on У8А steel

This paper presents the research results of the influence of diffusive metal coating by titan, vanadium, and chrome on the phase composition, structure and abrasive wear resistance of У8А steel. Using fixed and loose boron carbide abrasive, we establish the abrasive wear resistance. Crucially, we determine that diffusive carbide coverages, nitrides of transition metals, intermetallic compounds increase the abrasive wear resistance of У8А Steel by 2,1–4,3 times.