DOI: 10.18503/1995-2732-2022-20-2-107-119
Abstract
Problem Statement (Relevance). The paper is relevant because it presents the development of a thermodynamic approach to managing the processes of the structural modification of surface and near-surface layers during the formation of nanostructured topocomposites. The main problem is the need for developing theoretical approaches applied to get a target control over the layer-by-layer ion-vacuum modifying processing, when creating nanostructured topocomposites. Methods Applied. The ideas of the structural-thermodynamic approach developed by the authors to the analysis of plasma processes are a theoretical basis of the study. Experimental results were obtained using methods of ion-plasma and ion-beam processing, as well as ion assistance with cascade cross effect. To apply an intermediate oxidized layer, the authors used such surface chemical modification methods as oxidation and passivation. We also used the methods of electron microscopy, probe microscopy, and scratch testing of the samples to study the morphology and adhesive properties of the coating-interface-base systems. Originality. We have developed a structural thermodynamic model that reveals the nature of modification effects in the coating-interface-base system at the micro-, submicro- and nanostructural levels caused by ion-plasma flows. The connection between thermodynamic parameters and technological modes of ion-vacuum treatment has been established to control the processes of the structural modification of surface and near-surface layers. The formation of quasi-wave multimodal nanostructures was detected. Result. The thermodynamic analysis of the structural modification showed that the formation of the gradient structure of topocomposites was determined by activation structural processes and controlled by the density of the energy flow and the reaction of the material to it, and dissipative ones by the intensity of energy and mass transfer in the modified surface of the material. The defining characteristic of forming the type of structural-phase states and their extent (depth) in the coating-interface-base system is energy imbalance between activation processes determined by a degree of ion-vacuum effect and dissipative phenomena of structural relaxation of the base material. Practical Relevance. The results of the structural and thermodynamic analysis of modification processes allow us to purposefully form various types of gradient topocomposites with a given structure and composition of coatings, interface and near-surface layers of the base material.
Keywords
structural-thermodynamic approach, modification effects, ion-plasma treatment, coating-interface-base system, gradient topocomposites, degree of ion-vacuum effect.
For citation
Korotaev D.N., Tarasov E.E., Poleshchenko K.N., Teploukhov A.A., Semenyuk N.A., Orlov P.V., Churankin V.G., Lasitsa A.M. Improving the Technology of the Layer-by-Layer Formation of Nanostructured Topocomposites by Ion-Vacuum Treatment Methods Based on a Structural-Thermodynamic Approach.Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2022, vol. 20, no. 2, pp. 107–119. https://doi.org/10.18503/1995-2732-2022-20-2-107-119
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