INFLUENCE OF STRUCTURE AND COMPOSITION OF POWDER MATERIALS BASED ON Al-Fe-C ON THEIR WEAR RESISTANCE
DOI:
https://doi.org/10.18372/0370-2197.1(94).16470Keywords:
dispersion-strengthened alloys, wear, aluminum, structure, intermetallics, hardening, graphite, antifriction materialsAbstract
Now in the scientific world of materials scientists a lot of attention is paid to materials based on light alloys.. In this regard, promising are aluminum-based alloys, which are widely used in various fields of science and technology such as structural, electrical, heat-resistant, resistant to aggressive environments and more.. Particular attention is paid to the development of tribotechnical materials. The main structural component in aluminum alloys, which provides high wear resistance are inclusions of intermetallics. Obtaining which involves heat treatment – aging. However, this approach is limited by a certain temperature range because the thermal action causes the reverse dissolution of the alloying components in aluminum and the softening of the alloy. It is possible to obtain a stable structure when using iron as an alloying element. Due to the low solubility in aluminum it is possible to preserve the resulting structure both at room temperature and at elevated temperatures. However, classical casting methods do not allow to obtain small, evenly distributed inclusions of intermetallic specialties. Obtaining a set of physical and mechanical characteristics of such materials with predetermined properties is possible when using methods of powder metallurgy. Where the original components and their structural components are in a dispersed state. The effect of sintering temperature and composition of the initial charge on the resistance against abrasive wear of powder alloys Al + 15 wt.% Fe, Al + 15 wt.% Fe + 1-3 wt.% C compacted from powders obtained by mechanical dispersion of melts. It is shown that the resistance to abrasive wear increases with increasing sintering temperature from 600 to 800 ° C, which is due to the increase in the size of their structural component Al3Fe. Resistance against abrasive wear increases with increasing graphite content due to its lubricating action.
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