Elaboration of new ceramic membrane from spherical fly ash for microfiltration of rigid particle suspension and oil-in-water emulsion

Porous mullite ceramics from national clay produced by gelcasting

Preparation and characterization of tubular supported ceramic microfiltration membranes from fly ash

Fabrication and properties of porous mullite ceramics from calcined carbonaceous kaolin and α-Al2O3

Porous structures based on aluminum oxide-hydroxide (Al 2 O 3 -Al(OH) 3 ) show high refractoriness. Regarding their use as thermal insulators, the preparation of aqueous castable suspensions requires suitable conditions to produce stable co-dispersions and a deeper knowledge on their porogenic-sintering behaviors. This study reports on the characterization of a commercial grade of Al(OH) 3 and several transition phases of Al 2 O 3 (attained through the calcination of Al(OH) 3 ) aiming at their use as porogenic agents for castable porous ceramics. X-ray diffraction, thermogravimetry, Helium picnometer method, specific surface area and electron microscopy were used. The dispersion and rheology of Al(OH) 3 and Al 2 O 3 were investigated with pH variations and dispersants. Aluminum oxide and hydroxide particles showed high compatibility in aqueous medium and favored the preparation of suspensions. As porogenic agents, the transition phases showed a large quantity of meso-macro pores and a huge variation in the specific surface area, which highlight their potential to produce high refractoriness porous structures.

R Hutchison

Papers

Characterization of ceramic composite membrane filters for hot gas cleaning

Preparation of composite ceramic membrane from titania powders