What are the performance and advantages of breathable bricks

In terms of the working performance of the breathable brick, on the one hand, it has to withstand the contact of molten steel at 1600-1700 degrees Celsius; .Breathable bricks are refractory materials that are used many times. They are quenched and heated periodically, and cracks and falls are easy to occur near the working face. Oxygen burning and oxygen blowing cleaning. Blow oxygen to clean the permeable bricks, and clean up the residue and residual steel on the working surface to ensure the cleanliness of the working surface and the clearness of the gas passages. However, when the amount of oxygen blowing is slightly larger, the permeable bricks will be burned, and the ultra-high temperature is above 2000 degrees Celsius and strong Oxidation has great damage to the permeable brick. Corrosion. It is mainly the corrosion caused by the corrosion of molten steel and the penetration of the molten steel through the pores to the inside of the permeable brick, which will cause damage to the structure, which will lead to cracking and falling of the structure, or blockage when the penetration is serious. Ventilation channel to reduce blow-open rate and service life.

The measures to improve and ensure the blowing rate are as follows: carefully design the gas channel according to the use conditions, optimize the air channel structure, and improve the masonry method. For example, build 2 breathable bricks. Carefully operate and protect. After each pouring, the residual steel should be Clean up the slag and slag, and use oxygen or other gases (nitrogen, carbon dioxide gas, etc.) to clean the surface of the breathable bricks to ensure the cleanliness of the air passages. The entire operation process: tapping, refining, pouring, and breathable cleaning should be carried out smoothly, as far as possible. Shorten the interval time. You can also use gunning material. After the breathable brick is cleaned, spray the gunning material on the surface of the breathable brick. The residual heat of the breathable brick is sintered by the gunning material to form a honeycomb mushroom-shaped sintering. layer, which can not only ensure the permeability of the breathable brick, but also avoid the penetration of molten steel.

The damage of the breathable brick is related to the raw material, shape and structure design of the refractory material and the use environment. The research results show that the good quality particle gradation and the reasonable design of the breathable brick structure can improve the thermal shock stability and slag resistance of the breathable brick , so as to improve its use function. There are many factors that affect the service life of breathable bricks, but thermal peeling and oxygen cleaning are important reasons for the damage of breathable bricks. By adding silicon nitride, Sialon and other additives in the matrix, the breathable bricks have the same The characteristics of the molten steel are not wet, which reduces the corrosion loss rate. Reasonable design of the stirring time and stirring intensity of air blowing can reduce the damage of the permeable bricks. To prepare the permeable bricks for ladle with excellent functions, the focus of the research should be concentrated on the following aspects: Under the premise of satisfying the refinement process, select excellent additives, additives and aggregates form a high temperature solid solution phase during the heat treatment process to improve the thermal shock resistance of the material. Develop a new sintering process to prepare breathable bricks with special functions.