Ceramics-Silikáty 54, (4) 315 - 319 (2010)

Five lightweight castables containing the same porous periclase-spinel aggregates and different matrices were fabricated successfully. Effects of microsilica content on the porosity, strength and slag resistance of lightweight castables were investigated through the mercury porosimetry measurement, XRD, SEM, EDAX, and so on. It’s found that microsilica makes the matrix more densification and induces the pore growth through increasing the sinterability, and makes the penetrated slag high viscosity through reacting with slag, and then strongly affects the performances. When the microsilica content is 3.2 wt.%, the castable containing porous periclase-spinel aggregates has the best performance, which has a porosity of 24 %, a crushing strength of 90 MPa, a flexural strength of 22 MPa and a high slag resistance.