Ultrafine powder combined refractory castables are castables that belong to the low-cement series and the cement-free series. It is an important improvement in the development of new technology castables. There are many castable manufacturers called micro powder technology.
1. Ultrafine powder combined castable
2. Differences
The difference is that ultrafine powder is used instead of aluminate basin cement, which overcomes the defects of cement and takes advantage of ultrafine powder. Therefore, the castable material combined with ultra-fine powder not only maintains the characteristics of the ladle refractory castable, but also improves the slag resistance. It also overcomes the weak point of the castable that has a small strength ratio at high and medium temperatures, improving heat resistance and Anti-flaking properties.
3. Combined refractories castables are different from ordinary castables
Ultrafine powder combined castables are different from ordinary cement-free refractory castables. The function of ultrafine powder can overcome the phenomenon of low strength at medium temperatures. Without the addition of SiO2 fine powder in cement castables, the powder dry strength is low. Very detrimental to actual use.
The castables under ultrafine powder technology become stronger as the temperature increases. It can also increase the fluidity of castables at room temperature, making construction more convenient. Moreover, it can react with active SiO2 at medium and high temperatures to form mullite, and react with MgO to form spinel, which is of great help to the performance of the castable.
The amount of ultrafine powder added to refractory castables is not very large, generally no more than 3%, but after addition, the network structure can be maintained at higher temperatures. It also reacts with other minerals to form high-temperature phases, making the castables stronger and more resistant to slag.
