China Silica Brick suppliers tell you that Light -colored spots on the surface of the silicon brick have no effect on the quality of the product.
The raw materials of silicon bricks have high inflation factor, and seven crystal types need to be fully transformed to ensure that the silicon bricks do not crack, and because the shape of 7 crystal types is different. During the production process For example, lime and iron scales to accelerate the transformation of the crystal type, and the converted complete silicon bricks will not cause symptoms such as cracks.
After the silicon bricks are fired, the surface will appear or shallowly shallow. This is because the crystal type is reflected in the surface of the brick after the crystal shape is fully transformed, and the color of the silicon brick is yellow or yellow red. Some are yellowish colors, but the spots on the surface do not affect any indicators or quality problems.
In China Silica Brick suppliers, Silicon refractory bricks are fired in the restore atmosphere. Generally, the temperature increases slowly below 600℃ At 700℃-1100℃, the temperature can be quickly heated, but the temperature should be evenly heated. At the stage between 1100℃ and the firing temperature of 1430℃, the temperature should be reduced, and the temperature should be evenly heated to avoid cracks in bricks. At the high temperature stage, the temperature in the kiln must be evenly distributed to avoid high temperature flames to impact the brick.
During the cooling process, especially cooling below 600℃, it should be slowly cooled, which is also to prevent cracks. At the same time, pay attention to have enough insulation time. Generally, the insulation time fluctuates within 20-48 hours. This is why the tunnel kiln that fired silicon bricks does not require a silicon brick in a kiln of more than 150 meters. The kiln is shorter, which is why the silicon brick cannot be fired in China Silica Brick suppliers.
In addition, the granular ratio of silicon bricks is also very important. Generally, particles cannot exceed 3mm. Many China Silica Brick suppliers are controlled below 2.5mm. If the particles are too large, the expansion coefficient of the raw material of the silicon brick is not easy to control and it is easy to swell.
The process ratio and firing process of silicon bricks are very important. The production process is properly controlled to produce qualified products. However, the spots on the surface of the brick surface are completely due to the transformation of the crystal type, which has no effect on the quality of the product as the China Silica Brick suppliers said.
