PHYSICAL AND MECHANICAL CHARACTERISTICS OF COMPOSITE FLUORINE-CONTAINING COATINGS
DOI:
https://doi.org/10.36773/1818-1112-2026-139-1-131-137Keywords:
coating, titanium nitride, diamond-containing compounds, plasma, fluorinated oligomers, structure, propertiesAbstract
This paper presents the results of a study of the structure, morphology, and physical and mechanical properties of nanostructured composite coatings formed on steel substrates. The relevance of this study stems from the potential of thin-film coatings based on fluorine-containing oligomers (FCOs) in modern mechanical engineering due to their unique performance characteristics. The aim of the study was to investigate the influence of formation process modes and subsequent heat treatment on the properties of two types of coatings: those based on titanium nitride (TiN) modified with fluorine-containing oligomers and those based on diamond-like carbon (a-C:H), as well as their composites with FCOs. Base coatings of titanium nitride and diamond-like carbon were deposited using electric arc evaporation and pulsed cathodic arc plasma, respectively. Surface modification was performed using a solution method using fluorine-containing oligomers of the F-AK1 and F1 grades, followed by heat treatment in the temperature range from 373 to 573 K. It was found that the morphology of TiN-based composite coatings significantly depends on the application modes and post-treatment temperature. Heat treatment at 373 K was shown to promote oligomer spreading and fill microdefects, forming a smooth, uniform film. Increasing the temperature to 473 K initiates crystallization processes with the formation of "flake"-type structures, and at 523 K, partial desorption of the film and coarsening of crystallites are observed. For diamond-like coatings, the presence of absorption bands corresponding to C–H, C–C, C=C, and C≡C bonds was detected. It has been shown that heat treatment of composite diamond-like coatings modified with fluorinated oligomers leads to complex structural changes, changes in the sp²/sp³ ratio of hybridized carbon, and, ultimately, an increase in microhardness within a certain temperature range. Exceeding 573 K causes destruction of both the diamond-like coating and the fluorinated oligomer layer, reduced adhesion, and a drop in performance characteristics. It has been established that the application of fluorinated oligomers reduces the surface energy of the coatings, increasing their hydrophobicity.
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