This paper presents an experimental result on the effect of particle size of a mixture of ball clay, kaolin, and sawdust on thermal diffusivity of ceramic bricks. A mixture of dry powders of ball clay, kaolin of the same particle size, and sawdust of different particle sizes was mixed in different proportions and then compacted to high pressures before being fired to 950°C. The thermal diffusivity was then determined by an indirect method involving measurement of thermal conductivity, density, and specific heat capacity. The study reveals that coefficient of thermal diffusivity increases with decrease in particle size of kaolin and ball clay but decreases with increase in particle size of sawdust.

This paper presents a study on the effect of particle size of a mixture of kaolin and ball clay incorporated with wood sawdust on thermal conductivity of fired bricks. Powders of kaolin, ball clay and saw dust were mixed in certain proportions then compacted to high pressure of 50MPa before being fired to a temperature of 950 0 C. The results show that thermal conductivity increases with decrease in particle size of kaolin and ball clay, but decreases with increase in particle size of sawdust.