Effect of Some Additives on the Microstructure and Properties of Andalusite-cordierite Refractory

The effect of some additives on the microstructure and properties of andalusite-cordierite refractory is concerned with. A study has been made on Al₂O₃, Cr₂O₃ and SiC powders, which are selected as additives and added respectively to the standard formulation in varying amounts as extra content (2%, 4%, or 6%). As the results indicate, Al₂O₃ (best at 4%) and SiC (best at 2%) can improve the microstructure and the properties of the material.But Cr₂O₃ shows the effect to the contrary.