Effect of Modifying Additions on Synthesis and Properties of Cordierite-Mullite Ceramic from Kazakhstan Resources

Resumo

Results are given for a study of the effect of LiF, ZnO, and Ce₂O₃ modifying additions on synthesis and properties of cordierite-mullite ceramic from Kazakhstan resources. It is established that addition of LiF, ZnO, and Ce₂O₃ facilitates activation of synthesis for cordierite-mullite ceramic based on natural raw material. Addition of LiF reduces the temperature for the start of eutectic melt development, facilitating intensification of cordierite formation, and ZnO and Ce₂O₃ act by a solid-phase mechanism. Introduction of LiF, ZnO, and Ce₂O₃ into the composition of cordierite-mullite ceramic in an amount of 0.5 – 2.0% makes it possible to reduce its firing temperature and increase density, strength, and chemical and thermal stability.