In this paper, the lubricating abilities of several organic lubricants used in the powder metallurgy industry is investigated. On five kinds of lubricant, zinc stearate; stearic acid, aluminum stearate, lead stearate and, calcium stearate, mixing to Hoganas sponge iron powder, the following properties are compared with each other, as zinc stearate is standard.
(1) Dispersivity for mixing into metal powder.
(2) Effects on the physical characteristics of metal powder.
(3) Lubricating abilities for powder compacting and ejecting.