Abstract
The processing parameters for making ceramic tiles in the pyrophyllite–phosphoric acid binder (P–PA) system have been optimized. The optimized raw material composition requires sintering at a lower temperature of 950 °C. The X-ray powder diffraction studies on the powdered sample of optimized composition have confirmed the presence of dehydroxylate pyrophyllite, tridymite (T-AlPO 4), cristyoballite (C-AlPO 4) forms of aluminium phosphate and formation of silico-phosphate (SiP 2O 7) and alkali aluminium silicates (NaAlSiO 4, KAlSi 3O 8). The IR studies of the sample show Al–O, Si–O·P–O and Na/K–O linkages. The thermal analysis shows the formation of dehydroxylate pyrophyllite and different forms of AlPO 4. Scanning electron microphotograph reveals the chunky morphology of the dehydroxylate pyrophyllite, the rhombohedral morphology of T-AlPO 4 and spherical C-AlPO 4 and silico-phosphate particles.
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