Method for the production of sintered powder ferrous metal preform

摘要

A method for the production of sintered powder metal preform employing a novel reduction step. As-water-atomized ferrous metal particles are coated by phenol resins by adding said phenol resins to said ferrous metal particles after heating the metal particles to about 130 DEG C. to 150 DEG C. Resin coated ferrous metal particles are then filled in a mold and compacted under high pressure to produce a compacted green preform sufficient to ensure adequate strength for handling after pressing. The green preform is then heated to a reduction temperature within the range of about 1100 DEG C. to 1250 DEG C. for a time sufficient to achieve reduction of said green preform.