Abstract
Technology for the formation of composite materials with a magnesium matrix and a filler based on lead alloys has been proposed, which makes it possible to increase the tribotechnical properties of plain bearings. According to the proposed technology, a porous magnesium matrix with open porosity is obtained by filtration of a magnesium melt through water-soluble granules, which, after solidification of the melt, are leached into a solution of acetic acid. To obtain a composite casting, a porous magnesium matrix is impregnated with lead or lead alloys. The conducted studies of the formation processes of a composite material with a magnesium matrix and babbit filler showed that the proposed technology makes it possible to obtain composite materials with satisfactory filling of porous magnesium with babbit without discontinuities and visible defects. Filling temperature was 500 – 550 °С and preliminary heating temperature of porous magnesium 200 – 350 °С. Properties of the obtained composite with a magnesium matrix and Babbitt filler showed that the material has a lower, almost 2 times, density, higher thermal conductivity and better performance properties than lead-based alloys.
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