2.3 Direct Foaming Method3g
Th pores produced with this apprheroach result from the direct incorpmporation of air bubbles
int a ceramic susptopension, therefor there is no ne for extensive pyrolysis steps beforereeed
sinntering of the gre body. The steentabilization and setting of the we foams is the desetecisive
ste in direct foaepaming methods. The total poroosity of directly foamed ceramymics is