Heat-resistant composites based on a ternary binder suspension

Conclusions

Combining the processes of mechanical wet milling of a ternary mixture (quartz sand, scrap of the MKS-83 refractories, and monoclinic zirconium dioxide) and topochemical interaction between its particles and the ions of dissociated sodium silicate facilitates the formation of a gelatinous coating at the surface of the particles and, thereby, imparts adhesiveness (bonding capacity) to the suspensions and ensures thermal volume constancy of the castings.

We established the optimum pH value of the suspension for attaining its minimum viscosity and obtaining the maximum levels of the ultimate bend strength of the castings (4–5 N/mm²) and minimum open porosity (18–19%).

Based on the obtained suspensions and a corundum filler (the 2–0.5 mm and the minus 0.5-mm fractions), we developed casting bodies and obtained ceramic concretes (firing temperature 1400°C) having an ultimate bending strength of 28 N/mm² and capable of withstanding 54 thermal cycles (1300°C — water).