Structure and properties of the modified diffusion nitride-oxide surface layer

D Bazarov,Sherzod Berdiyev,Kholikul Eshkabilov

doi:10.1051/e3sconf/202126405054

Abstract

To combine the processes of gas nitriding and oxidation in water vapor, the effects of the atmospheric nitrogen potential in dissociated ammonia on the formation of surface diffusion nitride phases are studied.Modification of the surface nitride layer with oxygen was carried out by oxidation of the nitride zone at the second stage of obtaining an oxycarbonitride layer.The corrosion and wear-resistant properties of the nitride-oxide layer t of the lowest nitride layer are investigated, depending on the phase changes in the nitride layer after oxidation. The distributions of the elements in the nitride-oxide layer are determined, and the nature of the formation of the modified surface layer under the combination of gas nitriding with subsequent oxidation in water vapor is established.

Highlights

Increasing the durability and reliability of machine parts and equipment through the use of modern methods of surface hardening, in particular, a combination of chemical and thermal processing methods is achieved by creating modified diffusion surface coatings in their most critical working units and parts
Various types of nitriding processes and combinations of nitriding with other surface hardening methods are widely used in the world of mechanical engineering [5-11]
In the process of gas nitriding, the predominant diffusion of nitrogen occurs, and the structure and phase composition of the diffusion nitride layer is determined by the state diagram of the "ironnitrogen" system

Summary

Introduction

Increasing the durability and reliability of machine parts and equipment through the use of modern methods of surface hardening, in particular, a combination of chemical and thermal processing methods is achieved by creating modified diffusion surface coatings in their most critical working units and parts. In the process of nitrooxidation, with a change in one or another of the above factors in the corresponding stages of saturation with nitrogen and oxygen, a nitride oxide layer can be formed on the surface of the hardened product with properties for specific operating conditions [16-18].

Results

Conclusion