However, in many cases, the firing atmosphere of Silica mullite bricks is different from that of high alumina bricks or magnesia bricks, because carbon silicide is suitable for firing in a reducing atmosphere. In an oxidizing atmosphere, silicon carbide is oxidized, and the use effect will be greatly improved. reduce. Some manufacturers will add a certain proportion of metal aluminum powder to adjust the oxidation of silicon carbide in the production process. However, during the firing process, the firing atmosphere must be well controlled. The silicon carbide effect of silicon molybdenum bricks fired in a reducing atmosphere makes the appearance reaction obvious. And when used as a lining in a cement rotary kiln, it can prevent the melt from forming.
It should be noted that the amount of silicon carbide added also affects the color reflection of the Silica mullite bricks. When the amount of silicon carbide added is small, the reaction on the brick surface is relatively small. When the amount is less than 8%, the brick surface basically reacts little. , just a layer of slight discoloration. No surface glaze appears. If the temperature is too high, the surface reaction will not change much. But the most important thing is that the firing atmosphere has the greatest impact on the color of Silica mullite bricks. Of course, performance will also be reduced during use.
