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The paper studies the process of formation of physical, mechanical and tribological properties of carbonDiamond-like coating (DLC) diamond-like coatings (DLCs). CoatingsCoating with a thickness of 0.9 – 1.8 μm were applied to a substrate made of 40CrNiMo steel with a sorbite structure. A BRV 600 vacuum ion-plasma spraying technological unit was used, in which the graphite evaporation stage is implemented using laser ablation (sputtering). Carbon vapor deposition in the form of a coating was carried out in the working chamber of the unit at a pressure of 10−2 – 3 × 10−1 Pa using an Ar + N mixture as the working gas. Nitrogen was introduced into the vacuum chamber to stabilize the coating thickness instead of hydrogen traditionally used for this purpose. The use of hydrogen contributes to the explosiveness of ion-plasma technologyIon-plasma technology. The experiments showed that the use of nitrogen instead of hydrogen not only eliminates the fire hazard and stabilizes the coating thickness but can also be effectively used as a technological parameter %N, which controls the properties of the coatingsCoating. In the work, experimental dependences of the physical and mechanical (elastic modulus E and hardness H) and tribological (friction coefficient μ and friction path L before coating failure) characteristics of the coatings on the parameters %N, λ and F are obtained, where %N is determined in % by the gas regulator on the vacuum unit; λ is the current of the induction coils, which controls the volumetric power density of the ion flow of the deposited carbon; F is the friction load duringTribological test tribological tests. The obtained dependences were used to optimize the technology parameters (%N and λ) and friction conditions (F), providing a high level of coating properties (H, E, μ, L). It is shown that the ranges of values ​​of the parameters %N and λ required to obtain optimal mechanical and tribological properties of the studied coatingsCoating do not coincide. From this, a conclusion is made that, despite the importance of mechanical characteristics, under friction conditions they are far from always a determining indicator for the wear resistance ofDiamond-like coating (DLC) DLC coatings.

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Application of Laser Ablation and Nitrogen Stabilization to Obtain Ion-Plasma Diamond-Like Coatings for Anti-Friction Purposes

  • 会议论文

  • 发表日期：

    2025年

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  • A. I. Voropaev,
  • O. V. Kudryakov,
  • V. I. Kolesnikov,
  • V. N. Varavka,
  • I. Yu. Zabiyaka

摘要

The paper studies the process of formation of physical, mechanical and tribological properties of carbonDiamond-like coating (DLC) diamond-like coatings (DLCs). CoatingsCoating with a thickness of 0.9 – 1.8 μm were applied to a substrate made of 40CrNiMo steel with a sorbite structure. A BRV 600 vacuum ion-plasma spraying technological unit was used, in which the graphite evaporation stage is implemented using laser ablation (sputtering). Carbon vapor deposition in the form of a coating was carried out in the working chamber of the unit at a pressure of 10−2 – 3 × 10−1 Pa using an Ar + N mixture as the working gas. Nitrogen was introduced into the vacuum chamber to stabilize the coating thickness instead of hydrogen traditionally used for this purpose. The use of hydrogen contributes to the explosiveness of ion-plasma technologyIon-plasma technology. The experiments showed that the use of nitrogen instead of hydrogen not only eliminates the fire hazard and stabilizes the coating thickness but can also be effectively used as a technological parameter %N, which controls the properties of the coatingsCoating. In the work, experimental dependences of the physical and mechanical (elastic modulus E and hardness H) and tribological (friction coefficient μ and friction path L before coating failure) characteristics of the coatings on the parameters %N, λ and F are obtained, where %N is determined in % by the gas regulator on the vacuum unit; λ is the current of the induction coils, which controls the volumetric power density of the ion flow of the deposited carbon; F is the friction load duringTribological test tribological tests. The obtained dependences were used to optimize the technology parameters (%N and λ) and friction conditions (F), providing a high level of coating properties (H, E, μ, L). It is shown that the ranges of values ​​of the parameters %N and λ required to obtain optimal mechanical and tribological properties of the studied coatingsCoating do not coincide. From this, a conclusion is made that, despite the importance of mechanical characteristics, under friction conditions they are far from always a determining indicator for the wear resistance ofDiamond-like coating (DLC) DLC coatings.