MANUFACTURE OF IRON POROUS BODY USED FOR REINFORCING METALLIC PARTS FOR PRESSURE CASTING OF ALUMINUM OR THE LIKE

摘要

PURPOSE:To manufacture the iron porous body used for reinforcing metallic parts for pressure casting at low cost by packing iron powder into a heat- resistant vessel at specified bulk density and sintering the powder together with the vessel at a high temp. in a low oxygen atmosphere. CONSTITUTION:Reduced iron powder 1 (having about 1 to 1000mu grain size and about 45mu average grain size) is packed into a vessel 2 made of stainless steel into a cone shape by free-falling. The vessel 2 is vibrated and leveled into a planar shape to regulate the bulk density of the packed iron powder 1 to about 1.5 to 4.3g/cm2, which is sintered at about 1100 to 1150 deg.C in a mixed atmosphere of H2 and N2 while it is still in the vessel 2 to form a plate-shaped iron porous body 1a. The iron porous body 1a is preliminarily heated to about 100 to 300 deg.C and is charged to a mold 3 for casting, to which Al molten metal is poured from a sprue 3a, then, pressure of about 400 to 1000kg/cm2 is applied and solidifying is thereafter executed, so that the composite material 4 infiltrated with an aluminum material 5 perfectly into the core part of the iron porous body 1a can be formed.