Preparation method of self-lubricating insulated iron powder for motor magnetic core

A preparation method of a self-lubricating insulated iron powder for a motor magnetic core belongs to the technical fields of magnetic functional material and powder metallurgy. The preparation methodcomprises the steps of adding water-atomized iron powder or reduced iron powder that is produced industrially in phosphorated fluid, stirring for 10-90 minutes at temperature of 20-90 DEG C, filtering, washing and then adding the mixture in saponified fluid, stirring for 10-90 minutes at temperature of 20-90 DEG C, filtering, and at last conducting drying at temperature of 20-150 DRG C to obtainthe insulated iron powder which is coated with phosphate and zinc stearate on the surface and has lubricating function. The preparation method has the advantages of simple technology, low cost, easy formation of industrialized scale and capability of directly obtaining powder with high resistivity, good lubricating property and good compression property; and during forming, without adding any lubricants, the preparation me