Problems of Tribology = Проблеми трибології - 2021 рік

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https://elar.khmnu.edu.ua/handle/123456789/10463

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Перегляд Problems of Tribology = Проблеми трибології - 2021 рік за Автор "Стечишина, Н.М."

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  • Ескіз
    Документ
    Durability of working bodies of soil-cultivating machines strengthened by composite electrolytic coatings (CEC)
    (Хмельницький національний університет, 2021) Stechyshyn, M.S.; Kornienko, A.O.; Stechyshyna, N.M.; Martynyuk, A.V.; Tsepeniuk, M.I.; Herasymenko, V.O.; Стечишин, М.С.; Корнієнко, А.О.; Стечишина, Н.М.; Мартинюк, А.В.; Цепенюк, М.І.; Герасименко, В.О.
    The task of this work is to find the optimal ratio between the size of the particles of silicon carbide and their volumetric content in the nickel matrix to provide maximum characteristics of strength and wear resistance of the working bodies of soil-processing machines. The article investigates the processes of forming complex electrolytic coatings (CEC) on a nickel basis with particles of the filler of various sizes of silicon carbide (SIC). It has been established that the formation of a sicle size sicle and SiC5 is carried out on a vertical, and all other particles in a horizontal cathode. The volumetric content of SICnano and SiC5 particles in nickel reaches a maximum of about 10%, and SiC100 – 46 %. Cap with particle size 28/20 and 50/40 μm allow you to get the most wear-resistant coatings. In this case, the coating with particles 28/20 μm have higher wear resistance, but coating with particles 50/40 μm are more technological when they are formed. The size of the filler particles has a significant effect on the tribological characteristics of the CEP, namely wear resistance and friction coefficient. It has been established that the highest wear resistance and the smallest friction coefficients are characterized by coatings having as a filler of fractions 28/20 and 50/40 μm. Tribological studies show the promise and efficiency of the CEP to increase the wear resistance of the working bodies of soil-cultivating machines.
  • Ескіз
    Документ
    Hydrogen nitrogening in great discharge with AC power
    (Хмельницький національний університет, 2021) Stechyshyna, N.M.; Stechyshyn, M.S.; Martynyuk, A.V.; Gladkiy, Ya.M.; Стечишина, Н.М.; Стечишин, М.С.; Мартинюк, А.В.; Гладкий, Я.М.
    The paper substantiates and experimentally shows the possibility of anhydrous nitriding in a glow discharge (BATR) with AC power supply (AC), as well as the possibility of switching the shape of pulses, changing their polarity, which is solved by introducing a glow discharge nitriding device with a power source alternating current of a given frequency. The analysis of the results of metallographic studies of the modified layer indicated the presence of a more uniform gradient of hardness in depth (gradient decreased by 1.7 - 3.5 times), which increases the wear resistance of parts and quality indicators of strengthening parts while reducing processing costs and installation costs. At BATR in CCR with supply of current of industrial frequency the installation for realization of process becomes cheaper. The latter factor will contribute, among other aspects, to the wider introduction of BATR technologies. The use of alternating current affects the course and results of nitriding, as periodic changes in the polarity of the electrodes of the chamber contributes to the cleaning of the surface from the adsorption layer, which positively affects the nature of nitrogen saturation (gradient of microhardness times), contributes to a significant change in the phase composition of the surface modified layer and allows to expand the technological capabilities of nitriding in the direction of obtaining the required performance characteristics of working surfaces, in particular tribological characteristics