Silica Fire Brick

1.Silica brick properties

The thermal conductivity of the silica brick increases with the increase of the working temperature, and there is no residual shrinkage. During the oven process, the volume of the silica brick increases with the increase of the temperature. During the baking process, the maximum expansion of silica brick occurs between 100 and 300 °C, and the expansion before 300 °C is about 70% to 75% of the total expansion. The reason is that there are four crystal transformation points of 117°C, 163°C, 180~270°C and 573°C in SiO2 during the baking process, among which the volume expansion caused by cristobalite is the largest between 180~270°C.

2.Precautions for the use of silica bricks

When the working temperature is lower than 600~700℃, the volume of the silica brick changes greatly, the resistance to rapid cooling and rapid heating is poor, and the thermal stability is not good. If the coke oven works at this temperature for a long time, the masonry will be easily broken and damaged, so the volume of silica brick is relatively stable under high temperature for a long time.

3.Technical parameter 

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