Sintering of Glass - Steel Slag-SiC Composite as a Foam

Foam glass-ceramics are porous material with the desired strength. In this work, steel slag was mixed with soda lime glass in (۲۰, ۴۰, ۵۰, ۶۰, ۷۰ wt. %,denoted by SG۲۰,SG۴۰,SG۵۰,SG۶۰,SG۷۰) and ۵ wt.% SiC. Giving to Hot stage microscopy images, glass-slag composite's contraction starts at ۱۰۵۰ºC. According to the SEM micrographs the tunnel-like pore porosity resulted from the decomposition of  carbide phase were formed. The sizes of pors varies in ۵۰۰ - ۱۰۰۰ μm range. More over by the ۵۰ wt. %  soda lime glass addition and sintering at ۱۲۰۰ ° C, the spherical porosity were formed and the size of the porosity were reduced to ۵۰ μm in these composites. Also, by the the glassy phase increasing, the total porosity was increased to ۸۰%, the density decreased to ۰.۸g / cm۳in SG۴۰. This composite as a porous material has ۲ to ۵ MPa bending strengths. Wollastonite phase was detected in these composite.

Keywords:

Slag , Glass , SiC , Sintering , Foam