EFFECT OF Al2O3 CONTENT ON PROPERTIES OF POROUS GLASS-CERAMICS WITH FLY ASH

By means of x-ray diffraction (XRD), scanning electron microscopy (SEM) methods, compressive strength testing, and bending strength one, etc., the effect of Al2O3 content on properties of porous glass-ceramicswith fly ash was investigated. The results reveal that, the XRD peaks of every group of samples exhibit amorphous diffuse ones. From the analysis of 1#, 4#, and 5# samples, the primary crystalline phase of the system is the parawollastonite (monoclinic system), while no obvious crystal diffraction peaks is present for 2# and 3# samples. SEM shows that, the parawollastonite of 1# and 2# is arrayed orderly, with a shape of long columnar. The crystalline of 3# gives a incomplete grow and displays a short columnar. The content of the parawollastonite is a little low, which leads to disorderly array. The compressive strength and the bending one become decreasing, which is ascribed to the crystalline suppression of Al2O3. That is, with the increasing content of Al2O3, the parawollastonite from the crystalline becomes low, which indicates that the total strength get weaker.