Wear and Anti-flaking Resistance of Magnesia Calcium Brick
Wear and anti-flaking resistance of magnesia calcium brick
Magnesia calcium brick is mainly used as the lining material for refining equipment such as AOD furnace, VOD furnace and LF furnace in steelmaking industry. It is subjected to high temperature melting loss during use; chemical erosion and penetration of slag; air flow of slag and molten steel Strongly washed away. It causes various destructive effects on the magnesia calcium bricks during use. Therefore, it is necessary to increase the wear resistance and peeling resistance of the magnesia calcium brick.
1. Wear resistance of magnesia calcium brick
The wear resistance of magnesia calcium brick is in the process of refining, because the high-pressure gas is continuously blown into the furnace, the water and slag in the furnace are vigorously stirred, and the working surface of the magnesia calcium brick is strongly washed, so that it continuously abrasion. Therefore, it is necessary to improve the high temperature wear resistance of the magnesia calcium brick. The high temperature wear resistance of magnesia calcium brick is mainly reflected in the high temperature strength. The main reason that affects the high temperature strength of magnesia calcium brick is the ratio of MgO and CaO. Because the high temperature of MgO is better than CaO, the ratio of MgO to CaO is increased. The higher the high temperature strength, the better the high temperature wear resistance.
2. Anti-flaking performance of magnesia calcium brick
During the use of magnesia calcium bricks, cracking and spalling occur at the working end due to furnace temperature changes and slag infiltration, especially in VOD furnaces, and the spalling damage of magnesia-calcium bricks is more serious. Compared with other magnesia refractory products, CaO in magnesia calcium bricks has greater creep at high temperatures, can buffer thermal stress generated inside the brick due to rapid temperature changes, and inhibit crack generation and expansion in bricks. Improve the anti-flaking properties of magnesia calcium bricks.