Перегляд за Автор "Stechyshyn, M."

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  • Ескіз
    Документ
    Equipment and technology for gas fluorination of polymers to improve their wear resistance under micro-impact loads
    (Хмельницький національний університет, 2026) Martyniuk, A.; Stechyshyn, M.; Fedoriv, V.; Yaroshenko, P.; Liukhovets, V.
    The article addresses the problem of improving the cavitation–erosion wear resistance of polymer materials operating under micro-impact loads in corrosive environments. It is shown that material degradation under such conditions has a complex mechano-corrosive nature, while corrosion processes can significantly accelerate the degradation of surface layers. In this regard, the use of polymers with high chemical resistance and inertness to aggressive media is relevant. However, the application of such highly resistant polymers is often economically impractical, which necessitates the development of methods for surface modification of available structural polymers to improve their performance properties. he aim of this work is to develop and scientifically substantiate a laboratory installation and technological parameters of the direct gas fluorination process for polymer materials in order to form a modified surface layer without altering the surface microgeometry and to increase their wear resistance. Polypropylene grade 21060, widely used in mechanical engineering, agricultural machinery, and food equipment due to its sufficient strength, chemical resistance, and processability, was selected as the object of the study. A laboratory installation for direct gas fluorination of polymers was designed using a gas mixture of 1% F₂ and 99% Ar followed by treatment with nitric oxide to neutralize active radicals. Experimental studies showed the formation of a modified surface layer about 5 μm thick with increased chemical inertness. It was established that fluorination significantly reduces the intensity of cavitation–erosion wear of polypropylene in various environments, confirming the effectiveness of the method for improving the durability of polymer components.
  • Ескіз
    Документ
    Experimental installation for wear tests of materials and coatings
    (Хмельницький національний університет, 2024) Stechyshyn, M.; Dykha, O.; Oleksandrenko, V.; Tsepenyuk, M.; Kurskoi, V.; Oleksandrenko, Ye.
    On the basis of the analysis of existing tribological testing methodologies, which includes the selection of controlled wear parameters, the influence of the type of friction, contact geometry, surface roughness, the scheme of tribological research, the choice of a machine 2168UМТ for friction testing of materials is substantiated. The friction machine allows you to install three samples at the same time, change the pressure in the contact zone in a wide range, control the moment of friction, the rotation frequency of the counterbody, the number of revolutions (friction path), change the rotation frequency, respectively, the sliding speed, automatically limit the distance traveled and other functions. The method of wear is adopted according to the finger-ring scheme, linear wear is monitored using an indicator rack with a value of divisions of the measuring device of 0.001 mm. To fix the samples on the machine caliper, holders were designed and manufactured, which ensure the self-fixation of the sample on the counterbody - a spherical joint made of the rolling body of the bearing. due to the fact that the samples were pressed against the counterbody with a force corresponding to the nominal contact pressure, they were self-aligned. After the sample was self-assembled, the whole structure was fixed by tightening the nuts. The counterbody is made of a rolling bearing ring, the material is steel SHX15, the hardness of the base is HRC 61. Three devices are mounted on the caliper for permanent lubrication of the running track immediately before the approaching sample. Thus, at certain values of pressure and speed, the mode of marginal friction can be reached, which was marked by a low coefficient of friction.
  • Ескіз
    Документ
    Кавітаційно-ерозійна зносостійкість азотованих в тліючому розряді конструкційних сталей
    (Хмельницький національний університет, 2020) Скиба, Микола Єгорович; Стечишин, Мирослав Степанович; Люховець, Володимир Васильович; Стечишина, Надія Мирославівна; Лук'янюк, Микола Васильович; Skyba, M.; Stechyshyn, M.; Liukhovets, V.; Stechyshyna, N.; Lukianiuk, M.
    У роботі на основі втомно-електрохімічної теорії корозійно-механічного зношування та структурноенергетичної теорії кавітаційного руйнування металів досліджено вплив безводневого азотування в тліючому розряді (БАТР) на кавітаційно-ерозійну зносостійкість конструкційних сталей 20, 45, 40Х та 38ХМЮА в корозійно-активних середовищах-електролітах