Search academic texts

Information × Registration Number 0223U002199, 0120U102142 , R & D reports Title Creation of the physical bases for control of powders compaction during the injection moulding of parts for extreme operating conditions popup.stage_title Head Loboda Petro I., Доктор технічних наук Registration Date 12-02-2023 Organization National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" popup.description2 On the basis of physical experiments, regularities of the processes of densification, structure formation, phase composition, and stress-strain state of compacts from iron powders and a mixture of iron powders with alloying additives, after compaction (uniaxial pressing, MIM) sintering and heat treatment. Obtained and generalized results make it possible to establish the mechanism of intensification of processes sealing and strengthening powder steels with increased impact strength. A mechanism has been investigated for intensifying the speed and degree of compaction of powder compacts during sintering, which makes it possible to control the main processes of the technology of injection molding of powder steels by choosing the average particle size of iron powder and ligatures, their particle size distribution, the density of compacts, and parameters of the sintering process and stress-strain state on the stage of formation of developed contacts between particles, the strength of which exceeds the stresses created by capillary pressure. It has been established that the formation of contacts between powder particles at the first stage of sintering at a temperature of 0.25-0.3 from the melting temperature of iron ensures the formation of stresses in the compact material, which consist of the action of capillary pressure forces and intensify the rate and degree of compaction and the growth of coherent scattering regions. It has been established that residual stresses are greater, and the higher the purity of the material of the powder particles. Product Description popup.authors Bohomol Yurii I. Vterkovskyi Mykhailo Yaroslavovych Gavrylenko Vitalii Huriia Iryna M. Dobrovolska Iryna Елькаді Махмуд Zavadjuk Serhii Kapustjak Krystyna Karasevska Olga Kovalenko Mykyta Minitsky Anatoly V Mazur Vladyslav I. Nakonechnyi Sergyi O Remizov Dmytro Oleksiyovych Romanenko Yurii M Sankina Larysa Semenuk Valeriy Fedorovych Smirnova Yana Solovіova Tetіana Solodkii Yevgen V. Степанчук А.Н. Tkachuk Vasyl Trosnikova Iryna Yu. popup.nrat_date 2023-02-12 Close