Preliminary study on chemical and physical properties of ball clay and its sintered ceramic pieces from Kampung Dengir, Besut, Terengganu
2017
Siti Nadhirah Ahmad Zaid | Nur Atiqah Azwa Joulme Morad | Mohd Aidil Adhha Abdullah | Mohd Al Amin Muhamad Nor
Ball clays are fine-grained, high plastic sedimentary clay, and when fired will produce a light or near white colour. In this study, the chemical properties of ball clay from Kampung Dengir were characterized by using X-Ray Powder Diffraction (XRD) and Thermo Gravimetric Analysis (TGA) techniques. Ceramic piece was prepared by mixing of ball clay with water in a ratio of 2:1 for 2 hours and was aged for 24 hours before casting on the flat Plaster of Paris mold. The green body obtained was cut to form rectangular pieces and dried at 100°C before it undergoes thermal treatment at temperatures ranging from 800 to 1200°C for two hours with heating rate set at 5°C/min. Sintered ceramic piece was characterized by firing shrinkage, density, porosity and water absorption analysis. XRD analysis shows that the minerals present in ball clay were kaolinite, quartz and hematite. TGA analysis revealed the ball clay consists of 1.2% of water and 6.0% of organic materials,respectively. A good ceramic piece without cracks was obtained after casting give an indicator that this ball clay is suitable for making ceramic products. The properties of ceramic piece are highly influenced by sintering temperature. As the sintering temperature increased the amount of shrinkage and density was increased while porosity and water absorption decreased.
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