EFFECT OF COMPACTING PRESSURE ON INTERCONNECTED POROSITY IN IRON PM COMPACTS

摘要

The purpose of this work was to analyse the influence of compacting pressure on interconnected porosity in iron compacts, both in macro- and microscale. Size and volume fraction of micro- meso- and macropores were examined in compacts pressed under pressure within 200 to 400 MPa, made in laboratory conditions of iron powder ASC 100.29 manufactured by Hoganas AB company. The interconnected porosity was determined using a method based on measuring the sorption isotherms of CO_2 and benzene at T - 25 deg C in static conditions in a high-vacuum gravimetric appliance equipped with McBain-Bakr weighers. Relationships between compacting pressure and the interconnected micro- and macroporosity of the examined compacts were determined.