Properties of Oxynitride Steel Coatings Obtained Through Three-Stage Processes of Nitriding Combined with Oxidation

Boynazarov, Urol; Петрова, Л. Г.; Brezhnev, A. A.; Bibikov, Petr

doi:10.1007/s11015-021-01225-7

Cited by 3 publications

(3 citation statements)

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“…The concentration of oxygen dissolved in the matrix is much lower. The Auger analysis results are explained by the formation of oxides of alloying elements in place of the former oxide film [5,6,7]. Since the alloying elements form oxides in the region of the former oxide film, they impede the diffusion of nitrogen in the ε phase to a lesser extent, and the diffusion coefficient of nitrogen in the ε-phase (where the oxide film used to be) increases.…”

Section: Methodsmentioning

confidence: 99%

“…6, it can be seen that the depth of the nitride layer reaches a maximum as the pre-oxidation time increases, after which it begins to decrease. This is because with an increase in the oxidation time, the thickness of the oxide film also increases, and while an oxide film exists under the thin nitride layer, the nitride layer practically does not grow [5,6,7]. Moreover, the nitride layer formed on the surface prevents the release of oxygen into the atmosphere because the oxygen diffusion coefficient near the sample surface decreases.…”

Section: Methodsmentioning

confidence: 99%

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Formation of diffusion nitride-oxide coatings

Boynazarov

2023

E3S Web of Conf.

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It is known that nitro-oxide coatings were developed based on nitriding, which are obtained using a two-stage technology consisting of nitriding at the first stage of the process and vaporization at the second stage. Such processing provides high physical and mathematical characteristics of hardened parts. This technological process was improved by us due to preliminary oxidation, which made it possible to accelerate the production of nitride-oxide with the necessary physical and mechanical properties. This work makes a theoretical calculation of the oxidation processes and subsequent nitriding of steels and a comparison with experimental data on the example of 38X2MYA. The article presents an analysis of the formation of oxynitride diffusion protective layers obtained by a three-stage nitriding method at a temperature of 580° C, which consists of preliminary oxidation, nitriding, and subsequent steam oxidation. The article also describes the effect of the oxide film on the nitriding process during preliminary oxidation and nitriding under short-term conditions at a temperature of 580 S.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Formation of diffusion nitride-oxide coatings

Boynazarov

2023

E3S Web of Conf.

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“…(4) Nitrided layer hardness: Surface pre-oxidation can increase the hardness of nitrided layer to 120%. Studies have shown that the hardness after surface pre-oxidized nitriding can be increased by about 20-50% compared with traditional nitriding [182]. Surface preoxidation can also promote the uniform distribution of nitrogen, avoid the solid solubility limit of nitrogen in the nitriding process, and further improve the hardness and wear resistance of the nitrided layer [183].…”

Section: Effect Of Surface Pre-oxidation On Nitriding Efficiencymentioning

confidence: 99%

A Review—Effect of Accelerating Methods on Gas Nitriding: Accelerating Mechanism, Nitriding Behavior, and Techno-Economic Analysis

Zhou,

Xia,

Xie

et al. 2023

Coatings

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Gas nitriding, as a surface modification technology to improve the wear resistance of workpiece surfaces, is widely used in wind turbine gears, pressure vessel gears, high-precision die casting abrasives, and other areas. However, the gas nitriding time is too long, reaching 40–60 h, which reduces the efficiency of nitriding and hinders the development of gas nitriding. Therefore, various accelerating methods are born accordingly. This review first introduces the basic principle, microstructure, and process parameters of conventional gas nitriding. Then, five common accelerating methods are summarized: process parameter optimization, surface mechanical nano-crystallization, surface-active catalysis, surface pre-oxidation, and surface laser treatment. Then, the effect of acceleration methods on gas nitriding is analyzed for the acceleration mechanism, nitriding behavior, and nitriding efficiency. Finally, the technical economy of the acceleration methods is compared for three aspects: energy consumption, carbon dioxide emission, and cost. And, the technical maturity of the acceleration methods is compared according to technology readiness level (TRL) technology. Based on the above content, the advantages and disadvantages of the five accelerating methods are reviewed, and the concept of a multi-technology collaborative processing acceleration method is proposed.

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