What is the index temperature of clay bricks

The refractoriness of clay bricks is comparable to that of silica bricks, up to 1690~1730℃, but the softening temperature under load is more than 200℃ lower than that of silica bricks. In addition to the high-refractory mullite crystals, the clay bricks also contain nearly half of the low-melting amorphous glass phase.

Because the clay brick has a low load softening temperature and shrinks at high temperatures, its thermal conductivity is 15% to 20% lower than that of silica bricks, and its mechanical strength is also worse than that of silica bricks. Therefore, clay bricks can only be used in the secondary parts of coke ovens. Such as regenerator sealing wall, small flue lining brick and regenerator checker brick, furnace door lining brick, furnace roof and riser lining brick, etc.