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<p><b>Abstract</b>—The paper studies the issues of structure formation of coatings obtained by thermohydrochemical treatment (THCT), which allows increasing the durability of steel tools by 1.4–8 times, compared to traditional ones. THCT includes (1) hydrochemical treatment (HCT) of the tool in a boiling hydrosol of ceramic materials for the deposition of solid lubricant coatings and (2) heat treatment (HT). It was found that coatings with a nanocrystalline structure are formed with HCT steel with a nanocomposite structure and when heated above 500°C. A model scheme of the step-by-step formation of coatings during THCT of a steel tool is proposed, including hydrochemical (HC) production of nanocoatings in an aqueous dispersion medium based on the formation of polar micelles on the basis of ceramic nanoparticles under the conditions of the wedging action of surfactants, electrochemical and shock-pulse thermohydrodynamic action of a boiling aqueous dispersion medium, further transfer and discharge of micelles on a steel surface with the deposition of solid monomolecular layers, and then heat treatment.</p>

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Features of Structure Formation of Coatings in Thermohydrochemical Treatment of Steel Tools

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • A. A. Shmatov,
  • L. Soos,
  • Z. Krajny

摘要

Abstract—The paper studies the issues of structure formation of coatings obtained by thermohydrochemical treatment (THCT), which allows increasing the durability of steel tools by 1.4–8 times, compared to traditional ones. THCT includes (1) hydrochemical treatment (HCT) of the tool in a boiling hydrosol of ceramic materials for the deposition of solid lubricant coatings and (2) heat treatment (HT). It was found that coatings with a nanocrystalline structure are formed with HCT steel with a nanocomposite structure and when heated above 500°C. A model scheme of the step-by-step formation of coatings during THCT of a steel tool is proposed, including hydrochemical (HC) production of nanocoatings in an aqueous dispersion medium based on the formation of polar micelles on the basis of ceramic nanoparticles under the conditions of the wedging action of surfactants, electrochemical and shock-pulse thermohydrodynamic action of a boiling aqueous dispersion medium, further transfer and discharge of micelles on a steel surface with the deposition of solid monomolecular layers, and then heat treatment.