There are several situations in the cracks of silica brick: if it is a layer of cracks or vertical cracks of the brick, the first hammer of the pressure machine is not exhausted during the formation of the brick. If it is horizontal or mesh -like cracks, the temperature rises too fast during the drying process. In another case, improperly controlled temperature control will also produce horizontal cracks on the surface of silica brick.
Cracks should be said to be an important part of the yield of silica brick. If the control is improper, the cost will increase significantly.
Silica brick is acidic product. Compared with the high aluminum bricks of neutral products, the finished product rate is low. Another important reason is that the expansion coefficient of silica brick is high. Severe exceeding the standard.
During the burning of silica brick, the crystal changes and the volume expansion coefficient is large, which is extremely prone to cracking. However, if it is a micro -crack, it can improve structural elasticity.
The cracks of silica brick is divided into surface cracks and internal cracks. Among them, the cracks of the machine pressure and the temperature are fired. It is dry and not thorough, and the product’s moisture is not static, and it starts to be produced by high temperature sintering. At least 150 meters of kiln burned into silica brick, otherwise, the temperature insulation performance is not good, and the fissure ratio of the silica brick fired is burned. It will be very high.
Layer cracks appear in the process of product molding. The mold is aging or the brick is not exhausted, and layers of cracks will occur. The silica brick of layer cracks cannot be used. The inner quality is not good, and it cannot be used at high temperatures. This crack is a crack.
If it is a mesh crack, the temperature fluctuations are large, and the inner product is uneven. The other may be that the aggregate and powder are mixed unevenly during the mixing process, and the mesh cracks will also appear.
Silica brick with horizontal cracks appear on the outside of the kiln brick stack in the process of burning, especially the top -level products. The temperature is generated, and the fire road of the kiln car is not reserved, and the flame spray directly on the brick surface.
Cracks in silica brick is also related to the process. If there are too many fine particles, cracks will also occur. The quality of the binding agent added during the ratio will also crack. Drying does not discharge water or is not scientific in loading kiln cars. Quick, it is a bad situation of cracking.
If you want to control the cracks of silica brick, you must from the raw material ratio to the formation of molding and firing. The process of production of the process is seriously controlled. Each link must be paid attention to. If the time to control the burning brick, it will definitely solve the occurrence of cracks.
