Search academic texts

Information × Registration Number 0225U000819, (0122U000402) , R & D reports Title Development of instrumental composites based on polymeric metallocenes capable of non-destructive relaxation of local excited states in the contact zone popup.stage_title Розробка інструментальних композитів на основі полімерних металоценів, здатних до неруйнівної релаксації локальних збуджених станів в контактній зоні . Head Pashchenko Yevhen O., д.т.н. Registration Date 19-01-2025 Organization V. Bakul Institute of superhard material of the National Academy of Sciences of Ukraine popup.description1 Development of abrasive composite materials from diamond and cubic boron nitride based on metallocene-containing polymers capable of using reverse changes in molecular structure to relax local excited states of the surface of materials treated with reduced defects of the formed surface layers popup.description2  Metallocene-containing oligomers with glycidyl and unsaturated functional groups were synthesized. A significant increase in the solubility of the obtained oligomers in organic solvents with different boiling points compared to the starting phthalonitriles was found, by 1.5–2.2 times, which is a necessary prerequisite for effective combination with fillers (synthetic diamond and cubic boron nitride powders). For samples of composite materials functionalized with oligoferrocene derivatives and filled with cubic boron nitride powders, the Vickers hardness was determined: when using an oligomer with glycidyl fragments, the hardness is 13.76 HV at a concentration of 30% (by mass), and for vinyl-containing oligomers - 22.7 HV at a concentration of 40% (by mass). The tensile strength of composite materials based on vinyl- and glycidyl-containing ferrocenes, respectively, increases by 20% and 30%, and the elongation at break decreases by 10% and 15% compared to standard composites based on phenol-formaldehyde binder. Grinding wheels made of the developed tool composites with embedded metallocene fragments have undergone pilot-industrial testing at "Hydrosila" plant (Kropyvnytskyi) during the finishing hardened steels of HRC60, demonstrating processing performance (up to 3 mm2 / min) and the roughness of the processed surface Ra = 0.32 μm. The use of a metallocene-containing binder also allowed to reduce the number of defects on the grinding surface, increase the contact stiffness and wear resistance of products by 2.1 times. Product Description popup.authors Yerema Vasyl T. Bandurenko Mykhailo V. Bezukh Valentyn A. Bychykhin Viacheslav M. Honchar Liudmyla M. Dovhan Anastasiia H. Dubko Valentyna P. Kazmirchuk Tetiana V. Kazmerchuk Andrii P. Kaidash Oksana М. Kovalenko Yurii M. Korostyshevskyi Dmytro L. Koshil Liudmyla V. Koshkin Oleksandr M. Kukharenko Svitlana А. Lieshсhuk Iryna V. Lazhevska Olha V. Malik Mykola M. Myroniuk Oleksii V. Moiseienko Yurii V. Orhiian Iryna V. Petrenko Anatolii P. Rozum Volodymyr M. Riabchenko Serhii V. Savchenko Denys O. Sylchenko Yaroslav L. Skorohod Serhii V. Teniahin Yevhen O. Fedorenko Viktor T. Khrypkova Liudmyla D. Chernenko Andrii M. Shatokhin Volodymyr V. Shсhur Nataliia A. popup.nrat_date 2025-01-19 Close