Search academic texts

Information × Registration Number 0224U001322, 0121U100539 , R & D reports Title Development of methods for computer modeling of stress-strain and boundary conditions of structural elements of six-punch AVT and determination of optimal conditions for generating pressure in it popup.stage_title Head Leschuk Oleksandr O., Доктор технічних наук Registration Date 21-01-2024 Organization V. Bakul Institute of superhard material of the National Academy of Sciences of Ukraine popup.description2  It was established, using mathematical modeling the compression of a pyrophyllite container inside of a six-punched AHP with a plunger diameter of 560 mm that a container with a 58–59 mm rib provides the most favorable conditions for pressure distribution. The containers with a rib more than 59 mm reduce the size of the central isostatic compression zone by 5–10%. The simulation results have been confirmed with experiments on the growth of diamond single crystals carried out using the temperature gradient method and the solution-melt Fe-Ni-C and Fe-Al-C systems. They revealed a slight increasing growth rate (by 5–7%) and invariability of crystal’s structural perfection, which occurs as the cubic pyrophyllite container decreases from 59×59×59 to 58×58×58 mm. Solvent alloys based on Fe-Co and doped with Ti and Zr provide an increasing growth rate of diamond single crystals by 15–18% and they are optimal at elevated pressures achieved due to the reduction of the container. Studies of the influence of the design parameters of punches on the equivalent stresses within the areas of their possible destruction demonstrated that punches made of BK6 alloy are suitable for generating pressure up to 4.5 GPa, but for generating higher pressure (5.5–7 GPa) it is recommended to use punches made of high-quality KF308, HB02UF and NF alloys. Product Description popup.authors Zanevskiy Oleg O. Kosenchuk Tamara O. Lysakovskyi Valentyn V. Polotnuk Serhii B. Shidlovskii Vitalii I. popup.nrat_date 2024-01-21 Close