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Preparation and Properties of Porous Glass-Ceramics with Fly Ash

The porous glass-ceramics, i.e. SiO2-Al2O3-CaO-ZnO-R2O, was prepared with fly ash by means of the typical powder sintering method. The properties, microstructure, and morphologies of the prepared porous glass-ceramics was analyzed by employing differential thermo-gravimetric analysis/differential thermal analysis (TGA/SDTA), x-ray diffraction (XRD), scanning electron microscopy (SEM) methods, etc.. The experimental results illustrate that, the primary crystalline phase of the system is the parawollastonite (mon ̊Clinic system), with the short columnar-or bar-like grains. Furthermore, the pores of the prepared ceramics are basically composed of macro-pores, with a diameter size of 10μm~1mm. Besides, the well-distributed macro-pores are mutual independence, without formation of macro-pore mesh. All the analysis indicates that, the prepared porous glass-ceramics, i.e. SiO2-Al2O3-CaO-ZnO-R2O, can be candidate as one of the heat insulating materials.