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• W4313473469 abstract "Problem. Electro-spark alloying (ESA) is a promising process of surface modification, which allows obtaining a high-quality coating, is environmentally safe and energy efficient. Wide application in production is hindered by the need to develop the technology, as well as the lack of a mathematical model for predicting the properties of coatings depending on materials and processing modes. It is known that the high adhesive bond of the coatings obtained by the ESA method with the base is explained both by the intensive mixing of the electrode materials in the liquid phase and by the diffusion of the anode material into the cathode in the solid phase. The goal is to develop the mathematical model that allows describing the process of heat propagation in the coating during electro-spark alloying of the metal surface. Methology. The direction of technological thermal physics of N.M. Rykalin is widely known, it is based on the theory of thermal conductivity of the method of heat sources. Regarding the thermal conductivity of solid bodies, the most universal Green's function is the Kelvin solution - the fundamental solution of the heat conduction equation, which describes the temperature distribution in an unbounded solid body, which occurs after the release of a finite amount of heat in the form of an instantaneous point source. The mathematical model of the process of heat propagation in the product during ESA was described using the Laplace operator. It is taken into account that the temperature of the surface of the strengthened part depends on the thermophysical characteristics of the anode and cathode, the diameter of the electrode, as well as the speed of movement of the alloying electrode. Results. The original mathematical model that allows describing the process of heat propagation in the coating during electro-spark alloying of the metal surface is developed. It is shown that the larger the diameter of the electrode, the higher the temperature at the coating-base interface, and therefore the better the adhesion of the coating. The optimal speed of moving the electrode is 0.5-1.5 m/s. Practical value. To obtain the best adhesion of the coating to the base, it is necessary to use an electrode with the largest diameter of 4.5 mm in combination with a low speed of moving the electrode." @default.
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• W4313473469 date "2022-11-29" @default.
• W4313473469 modified "2023-09-25" @default.
• W4313473469 title "Mathematical model of the heat distribution process in a steel part during surface modification by the electro-spark alloying method" @default.
• W4313473469 doi "https://doi.org/10.30977/bul.2219-5548.2022.98.0.63" @default.
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