Characteristic of interconnected porosity in ferrous PM compacts

摘要

The purpose of this work was to quantitatively describe the interconnected porosity in iron compacts, both in macro- and micrdscale. Size and volume fraction of micro-, meso- and macropores were examined in the compacts with density within 5.6-6.4 g cm~(-3), made in laboratory conditions of two iron powders: NC100.24 and ASC100.29 manufactured by Hoganas Company. The interconnected porosity was determined using the 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. Volume distributions of individual size classes of micro- and mesopores in the compacts made of both iron powders with fixed density were compared. Relationships between density and the interconnected micro- and macroporosity of the examined compacts were determined.