Abstract
It is the purpose of this study to investigate the influence of type and quantity of lubricants on the dimensional change, tensile and fatigue strengths of electrolytic iron powder compacts.
The results obtained were as follows:
(1) The dimensional changes of Fe compatcs containing Ca-and Mg-stearates showed a little shrinkage with higher lubricant contents at low compacting pressures, but for high applied pressures, a tendency to considerably expand as increasing lubricant contents from 1.0 to 1.5 wt%.
(2) The tensile strengths of Fe compacts containing 0.5 wt% lubricants, increased with higher sintered densities as well as in the case of die-wall lubricant. For 1.5 wt% lubricant contents, they depended upon the types of lubricant, specially those of the specimens containing Ca-, Mg- and Co-stearates remarkably decreased at sintered density above 6.7 Mg/m3.
(3) The fatigue strengths of Fe compacts containing several lubricants were due to the type and quantity of lubricants. In particular, those of Fe compacts containing 0.5 wt% Mg- and 1.5 wt% Ca-stearates considerably decreased in comparison with other lubricants.
