Introduction Of Corundum Mullite Bricks
Corundum mullite brick body was formed by a 300t friction press with a density of 2.7g/cm3. The billets are dried in a tunnel dryer. The inlet temperature is 40~50℃, the maximum drying temperature is 130℃, the drying time is 48h, and the water content of the body is not more than 1.5%. The product is fired in the tunnel kiln, the firing temperature is 1550℃, and the holding time is 10h.
The high temperature main crystalline phases of corundum mullite brick are corundum and mullite. The crystals of corundum are short columns and barrels, which are not interspersed and interlaced in the resistant material structure. The corundum crystals are interlaced with mullite columnar crystals, which can effectively prevent the sliding of corundum crystals and obtain a stable structure. Because the crystal structure is more stable, it is more conducive to the excellent performance of mullite or mullite and corundum, such as melting point: mullite 1870℃, corundum 2050℃, and the high fusion temperature of the two is 1840℃, which is conducive to the improvement and improvement of the high temperature performance of the material.
