: It was investigates that the relation between adhesive strength of 2 types of silica mortars to silica brick and the phase transition behavior during heating. The adhesive strengths, thermal expansion curves and SiO2 phase transition behavior of both mortar were examined. The adhesive strength of one silica mortar in which SiO2 transformed from quartz to tridymite and cristobalite quickly was about 2MPa after heat treatment at 1,400℃ without pressing. The origins of this adhesive strength were the generation of chemical bonding between the mortar and the silica brick, and the closeness of thermal expansion behavior of them reinforced it. While the adhesive strength of the other silica mortar which sintered through liquid sintering and transition of SiO2 was less than 2MPa. The mechanism of adhesion of this type is mechanical bonding which is generated by the penetration of liquid into the roughness of brick surface.

View full abstract