Thermal Conductivity of Aloji Fireclay as Refractory Material

This investigation was concentrated on the thermal behavior and insulating property of the Aloji fireclay for its suitability of being used as refractory lining. The Aloji fireclay brick has thermal conductivity of 0.05 K (W/m.k). Heat capacity of the brick was 0.56 J/g °C at the minimum temperature of 93.33 °C as compared to 0.3 J/g °C obtained at the maximum temperature of 600 °C. The heat capacity of the clay showed that as temperature increases the heat capacity changes with phase changes. The Aloji fireclay DSC result showed a glass transition at mid-point of 554.74 °C with exothermic reaction at 510 °C as energy being released and then crystallized. The clay sample was subjected to TG+DTA analysis. The TGA result had shown that there were material weight losses of 0.076 mg, 0.25 mg and 0.52 mg at temperatures of 47.79 °C, 348.12 °C and 639.67 °C respectively. The DTA shown that there were endothermic and exothermic reactions.