1.Refractoriness and load softening temperature
The refractoriness of silica bricks is generally 1690~1730℃, and the load softening temperature of silica bricks is relatively high, about 1650℃. The load softening temperature and refractoriness of silica bricks are close to each other. This is mainly because the main crystal phase of silica bricks is tridymite with spearhead twin crystals forming a network structure and the matrix is a glass phase with high viscosity.
2. Slag resistance
Silica bricks are acidic refractory materials that have strong resistance to the erosion of acidic and weakly acidic slag and corrosive gases.
3. High temperature volume stability
During the heating process, in addition to a certain thermal expansion, the silica brick also undergoes crystalline transformation and is accompanied by volume expansion. If there is untransformed residual quartz in the brick, it will continue to change into tridymite or cristobalite at high temperatures, resulting in a large volume expansion.
4.Thermal shock stability
Silica bricks have poor thermal shock resistance and can only be water-cooled 1 to 2 times at 850°C. The reason is that during the high-temperature rapid cooling process, the crystal form of the silica brick will undergo transformation, which will cause a large volume change. This is a major weakness of silica bricks.
