Preparation and Properties of Porous Glass-ceramics with Fly Ash

摘要

The porous glass-ceramics, i.e. SiO_2-Al_2O_3-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 (monoClinic 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. SiO_2-Al_2O_3-CaO-ZnO-R2O, can be candidate as one of the heat insulating materials.