Why Choose Explosion Proof Fiber Add Refractory Castable
Casting linings for lining of high-temperature equipment are often expected to shorten the baking time and achieve the purpose of rapid baking and production.
However, there is free moisture in the refractory castable. Increasing the baking temperature will cause the liner to rupture or peel off, requiring recasting.
Explosion-proof fiber is light in weight and can be made according to user requirements. The melting point is only about 150 degrees. Applicable to all kinds of bulk materials such as spread materials, castables and other amorphous refractories, explosion-proof fibers and other refractory materials are evenly mixed, after forming, baking, as the baking temperature rises and reaches a certain temperature The fibers begin to soften, shrink, melt, and finally form pores and carbonize. They are distributed in the construction body to form tiny network pores, which can open the water and gas passages, reduce internal stress and prevent bursting.
Explosion-proof fiber has a low ignition point or the explosion-proof fiber will shrink when baked at a low temperature, and burns off before the castable dewatering generates a large amount of water vapor to form a fine exhaust passage.
(2) Explosion-proof fiber is only as thin as hair, about 15-35 microns, which improves air permeability and improves burst resistance.
The length of the explosion-proof fiber is 5-10mm, which is mis-distributed in the castable lining, and forms a network-shaped exhaust passage after low-temperature combustion.
The amount of explosion-proof fiber is strictly required, the amount of addition is too small, and the gas permeability is poor; excessive addition amount will reduce the bulk density, strength and high temperature performance of the castable.
The length of the explosion-proof fiber is 5-10mm, which is mis-distributed in the castable lining, and forms a network-shaped exhaust passage after low-temperature combustion.
The amount of explosion-proof fiber is strictly required, the amount of addition is too small, and the gas permeability is poor; excessive addition amount will reduce the bulk density, strength and high temperature performance of the castable.
The high-performance castables currently in use generally incorporate hydraulic cement and some fine powders, of which explosion-proof fibers play an unusual role. How to safely and quickly remove the moisture in the refractory castable has always been a difficult problem in masonry baking. The water in the castable exists in three ways: free water, adsorbed water, combined water. Among them, free water and adsorbed water account for the majority, and free water can be removed when heated to 110 ° C. The adsorbed water is mainly a water film formed on the surface of the fine powder by a water reducing agent, and evaporates at about 180 ° C. The crystallization water is mainly crystalline water in CAH10, C2AH8, C3AH6 and AH3 formed by cement hydration, and can be generally removed at about 250 °C. Hydrates, especially gibbsite, emit a large amount of gas during the drying process, which is prone to bursting. In order to reduce the occurrence of bursting, the temperature can be slowed down in the free water stage for a longer period of time, ensuring the formation of fine through pores inside the body to ensure the smooth escape of the adsorbed water and the crystal water. Explosion-proof fiber plays an important role in the manufacturing process of high-performance castables as an anti-explosive agent.
