High Alumina Bricks vs Clay Bricks
High Alumina Bricks vs Clay Bricks
Blog Article
High alumina bricks and clay bricks are common refractory materials in many industrial applications, but they have some key differences:
1. Chemical composition:
High alumina bricks: The main component is alumina (Al₂O₃), which is generally above 48%, and some can even reach 90% or more. The high aluminum content gives this brick excellent refractory properties.
Clay bricks: The main component is aluminum silicate (Al₂O₃-SiO₂), in which the content of alumina is usually between 30% and 48%. The rest is mainly silica and other impurities.
2. Refractory:
High alumina bricks have a high refractory property, usually above 1770°C, due to their high content of alumina.
The refractoriness of clay bricks is relatively low, usually between 1580°C and 1770°C.
3. Slag erosion resistance:
High alumina bricks have good resistance to both acidic and alkaline slags, especially the high alumina part of high alumina bricks.
Clay bricks have a certain resistance to acidic slag, but poor resistance to alkaline slag.
4. Application areas:
High alumina bricks are suitable for high temperature environments, such as heating furnaces in the steel industry, glass melting furnaces, cement rotary kilns, etc.
Clay bricks are suitable for medium to high temperature industrial furnaces, such as sintering furnaces, ceramic kilns, certain parts of glass furnaces, etc.
5. Price:
Due to the higher raw material cost of high alumina bricks and the more complicated manufacturing process, their prices are generally higher than clay bricks.
6. Physical properties:
High alumina bricks generally have higher mechanical strength and lower thermal expansion, which makes them better structural stability at high temperatures.
Clay bricks have relatively low mechanical strength and thermal stability, but their price and availability make them still widely used in some applications.
When choosing which brick to use, you need to consider the specific application environment, including factors such as temperature, chemical environment, and physical load. Based on these conditions, it is more appropriate to decide whether to use high alumina bricks or clay bricks.