Development of a technology of compaction of increased-density parts using gas drainage methods

The influence of the amount and dispersion of technological lubricant (zinc stearate) and solid lubricants (talc, graphite, calcium fluoride) as well as the sintering temperature and time on the physical and mechanical properties of sintered iron is studied. When the stock contains no technological lubricant the porosity of the specimens drops to 5.0-5.2% but their strength is substantially greater than that of SP10 and SP30 steels of the same porosity. The strength of the specimens is highest when the iron powder has the smallest grain size. Solid lubricants in the stock result in the pressed iron-powder parts having poorer mechanical properties, although they do act in part as technological lubricants during compaction. Favorable results may be obtained by complex alloying of the stock, i.e., the simultaneous introduction of several solid lubricants.