Search academic texts

Information × Registration Number 0223U002285, 0120U101225 , R & D reports Title Fundamental features of the behavior of granular materials in 3D printing technologies and consolidation of fine powders under spark plasma sintering and conventional isothermal sintering popup.stage_title Head Shtern Mikhail Borysovych, Доктор технічних наук Registration Date 14-02-2023 Organization Institute of Problems of Materials Science named after IM Frantsevich of the National Academy of Sciences of Ukraine popup.description2  Based on the ideas of the theory of compaction of granular media and using the method of discrete elements, the principles of controlling the density distribution and the final configuration of the product obtained using 3-D technologies were formulated. The processes of selective laser sintering and melting in SS316L stainless steel matrix composites with inclusions of tungsten carbide were optimized. It has been established that a non-porous product can be obtained only if the liquid metal exists for a sufficient time to fill the largest pores in the bulk. This time increases with an increase in the concentration of ceramic inclusions both due to an increase in the effective viscosity of the metal and the maximum pore size. The injection molding process was analyzed using computer modeling methods. In particular, the filling of the cavity of the molds for the production of products in the form of a solid ball, a ball with an axial cylindrical hole, an orifice and a funnel was analyzed, and correlation dependences were established for a thermoplastic mass based on aluminum nitride powder. The time of filling the mold was determined depending on the characteristic diameter of the product and the length of the weld lines and the effective viscosity of the thermoplastic mass. An analysis of shrinkage processes and evolution of pore and grain microstructure during sintering of granulated tungsten powders was carried out. The influence of the original components and additional niobium doping on the consolidation, structure and mechanical properties of alloys based on γ-TiAl was studied. Product Description popup.authors Yepifantseva Tetiana О. Ivanova Inna I. Antonenko Dmytro А. Bezdorozhev Oleksii V. Braha Hanna S. Vasylieva Halyna M. Hetman Olga І. Demydyk Oleksandr M. Kirkova Elena G. Kartuzov Yegor V. Klymenko Valerii M. Klymenko Oksana А. Koreniev Oleksandr P. Korenieva Nadiia I. Korniichuk Olena V. Krylova Natalia A. Kuzmov Andrii V. Maidaniuk Oleksandr P. Makarenko Olena S. Maksymenko Anrii L. Mykhailov Oleh V. Morozov Ihor A. Morozova Raisa О. Nahorna Adelaida А. Opanasenko Maryna V. Parkhomenko Iryna V. Pereviazko Tamara M. Podoliako Tetiana I. Radchenko Petro Ya. Sokol Liudmyla K. Filippov Mykola I. Khachvankyan R. V. popup.nrat_date 2023-02-14 Close