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Information × Registration Number 0225U000067, (0123U104531) , R & D reports Title Development of plasma technologies for strengthening coatings used in extreme conditions popup.stage_title Виготовлення лабораторної установки плазмового гальванічного борування. Виконання модифікування зразків гарматної сталі з покриттям хромом методом плазмового гальванічного борування. Дослідження структури, твердості, дюрометричних властивостей і термоциклічні випробування зразків гарматної сталі з покриттям хромом, модифікованих бором. Розроблення технології модифікування зразків гарматної сталі з покриттям хромом способом плазмового гальванічного борування. Head Stapenko Eduard Р., д.ф.-м.н. Registration Date 04-01-2025 Organization Ukrainian State University of Science and Technologies popup.description1 Development of technologies for modifying coatings applied by the ion-plasma method, with additional plasma processing in order to increase the service life of products operating in extreme conditions of temperature, pressure, friction, including the channel of gun barrels. popup.description2  To implement the modification of chromium coatings by the plasma galvanic boriding (PGB) method, a laboratory installation was manufactured. The laboratory installation for conducting plasma galvanic boriding was made of polypropylene with external dimensions of 180×180×215mm, wall thickness – 15mm. With these dimensions, the volume of the bath is 4.5l. The wall thickness was 15mm, which should ensure the mechanical strength of the structure at temperatures of about 100 C. A DC source was used for the plasma galvanic boriding process, which provided a current strength of 0-15A at a voltage of 0-30V. The PGB process was carried out at different parameters of current density and process duration. The optimal PGB modes were determined based on the appearance of the coating and the mechanical properties it acquired. It was found that the maximum current density was 2.5 A/cm2. Further increase in current density led to deterioration of coating quality. The optimal time of the PHB process was 10 minutes. To study the effect of PGB on chromium coatings, metallographic studies of the surface and cross-section were carried out. X-ray structural analysis of modified coatings also showed the effect of PGB on changing the structure and phase composition of the surface layer of the chromium coating. The effect of PGB on chromium coatings was also revealed in the study of mechanical properties (microhardness, wear). The effect of PHB process parameters on hardness and wear was investigated. From these studies, the optimal parameters of PHB for chromium coatings were determined. Thermocyclic studies showed that the PHB process does not lead to delamination and cracking of coatings. Product Description popup.authors Volnianskyi Dmytro M. Hulivets Oleksii M. Zabludovskyi Volodymyr O. Halyna I. Perchun Pohrebna Nataliia E. Shtapenko Eduard Р. popup.nrat_date 2025-01-04 Close