- Time:Aug 11, 2023
To improve the strength of refractory bricks, the following aspects can be considered:
1. Choose the right material: The material selection of refractory brick is very important to its strength. Common refractory materials include high alumina bricks, magnesia alumina bricks and silica bricks. Selecting a refractory material with higher compactness and lower porosity can increase strength.
2. Control the sintering temperature and time: Sintering is a key step in the production process of refractory bricks. By controlling the sintering temperature and time, the crystal morphology and grain size of refractory bricks can be affected, thereby improving their mechanical properties. Generally, higher sintering temperature and longer sintering time can improve the strength of refractory bricks. However, attention should be paid to avoid excessive sintering and grain growth caused by excessively high temperature and excessively long time, which may reduce the shock resistance of refractory bricks.
3. Add reinforcing agent: Adding some reinforcing agent to refractory brick can significantly improve its strength. Commonly used reinforcing agents include finely divided particles of alumina, silica or other metal oxides. These reinforcing agents can fill the pores, increase the density of the brick body, and improve the mechanical properties.
4. Optimizing formula: By rationally adjusting the formula of refractory bricks, including the proportion and type of aggregate, binder and additives, its strength can be improved. For example, adding some fine-grained and active powder as a binder in an appropriate amount can enhance the bonding force and strength of the brick body.
5. Control molding pressure and temperature: In the molding process of refractory bricks, proper molding pressure and temperature can improve the compactness and bonding force of the brick body, thereby increasing the strength. Higher molding pressure and appropriate molding temperature can reduce porosity and improve the bonding force between particles.
6. Optimize the drying and sintering process: After the refractory brick is formed, it needs to go through the drying and sintering process. Controlling the temperature and time of drying and sintering, and gradually raising and lowering the temperature can avoid excessive stress on the brick body, thereby improving the strength and crack resistance of the brick body.
In a word, the strength of refractory bricks can be effectively improved by selecting appropriate materials, optimizing formula, controlling sintering process and forming parameters. However, practical adjustments are required on a case-by-case basis, and care must be taken during preparation to avoid loss of other properties due to overheating or overcompaction.
