STUDY OF FORMATION PROCESSES, STRUCTURE AND PROPERTIES OF POROUS FRAMEWORKS
Procesi littâ, 2024, Vol 1 (155), 58-71
DOI:
https://doi.org/10.15407/plit2024.01.058Keywords:
metal chips, structure, porosity, prediction, technological processes, geometric dimensions of the porous channelsAbstract
Waste from machine-building companies in the form of ferrous and non-ferrous metal chips can have a negative impact on the environment. Some of the possible environmental consequences of metal cord and chips waste are air pollution, dust generation containing harmful chemicals such as lead, cadmium, chromium and other toxic metals, soil contamination, water pollution. All of these pose a threat to human and animal health. It was established that the treatment of metal chips with a 0.1 normal solution of hydrochloric acid in alcohol removes harmful impurities (aluminum, zinc, lead) from the surface of metal chips, which are part of lubricating and cooling fluids and reduces the sulfur content on the surface from 0.146 to 0.089 %. At the same time, hydrochloric acid activates the surface of steel chips by converting iron oxides or hydroxides into iron chlorides, which in turn promotes wetting processes during the infiltration of liquid aluminum melt. Annealing at a temperature of 700 °C in an environment of sharply dehydrated hydrogen improves the plastic properties of metal chips and reduces internal compressive stresses from -450 MPa to -112 MPa. Annealing in a reducing environment decreases the amount of iron oxide on the surface of metal chips from 11.0 % to 7.0 %, which further improves its plastic properties. The study of the process of forming a porous framework showed that at pressing pressures of 50-150 MPa, porosity at the level of 30-50 % is ensured. Increasing the pressing pressure is impractical due to the rise in the number of closed pores that impede the infiltration of the liquid melt. According to the results of repeated modeling, it was found that energy-absorbing elements formed from metal chips after annealing have higher physical and mechanical characteristics and impact absorption energy compared to a metal frame made of non-annealed chips.
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Copyright (c) 2024 М.М. Ямшинський, Є.Г. Биба, А.В. Мініцький, І.В. Лук’яненко, С.П. Бісик, В.В. Гринюк, Б.В. Кивгило
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