Two methods of forming, namely, semi-dry press and slip casting were used to
fabricate porous ceramics from local raw materials, kaolin and silica. Different
wt.% of aluminum-zinc mixture powders were used as gas creative agent in
chemical swelling method to create porosity in ceramic slurry before forming.
Dried formed ceramics were fired at four
different firing temperatures of (900, 1000, 1100 and 1200)°C.
It was found that the forming technique has a great effect on the properties of
the fabricated porous ceramics. From porosity point of view, slip casting is better
technique to produce high porous ceramics, but semi-dry pressing seems to be
good for other physical properties and mechanical properties.