Influence of Nanodispersed Silica on the Physical and Mechanical Properties of Refractory Ceramics

Abstract

In this paper the contribution of heterocoagulation of silica sols on powder materials to the formation of nanostructured forms of silicon oxide is presented. To a greater extent heterocoagulation is more appeared on the advanced surfaces of refractory particles and clay, and to a lesser extent on the particles of alumina and silica oxide, the surfaces of which contained significantly fewer active centers. Silica sols have positive effect on drying and firing modes of ceramic materials. It was established that the application of silica sol as binder in the preparation of aluminum silicate ceramics allows to reduce the firing temperature to 150-200oC with a simultaneous increasing of strength characteristics.