Abstract
Three porcelain stoneware compositions were formulated using common ceramic minerals and slag of metallurgical industries. Standard body was prepared by mixing 45 % kaolin, 40 % feldspar and 15 % quartz (VP 1), and other two contain blast furnace (BF) and basic oxygen furnace slag replacing 30 % of feldspar (VP 2 and VP 3, respectively). The physical changes, phase transformation and mass loss were measured by simultaneous thermo-gravimetric and differential thermal analysis up to 1150 °C. The endothermic peaks obtained in the range of 519–520.79 °C were due to the dehydroxylation of kaolin and α to β quartz transformation. The exothermic peaks in the range of 1000–1080 °C were attributed to mullite crystallization. The compacted samples were heated in the temperature range of 1150–1280 °C. It was found that addition of slag replacing part of feldspar brought early vitrification compared to standard body. It was also observed that BF slag containing vitrified body shows superior flexural strength (>80 MPa). X-ray diffraction pattern, field emission scanning electron microscopic studies and energy-dispersive X-ray analysis confirm the presence of quartz and mullite in VP 1 and anorthite and quartz crystals in VP 2 and VP 3.
Published Version
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