How are cementless refractory castables combined
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2024-01-11
Cement free refractory castables are advanced castables that are produced by composite ultrafine powder technology or by combining with sol to form refractory castables.
Due to the absence of cement, the calcium content of the castable is less than 0.2%, and the low melting material formed is also very rare, so its performance is better than that of ordinary low cement castables. The varieties of cementless castables include aluminum silicate, mullite, corundum, magnesium series, and silicon carbide series. The setting and hardening of this type of castable is achieved through the coagulation and bonding of ultrafine powder, which obtains strength. Additives, like low cement castables, play a promoting role. Cement free castables can use oxide ultrafine powder as a binder, or silica sol or aluminum sol as binders, or a combination of the two can be used. For example, alumina ultrafine powder or silica ultrafine powder is used for corundum based castables. Aluminum silicate castables can be made by adding silica ultrafine powder and alumina ultrafine powder, or by using silica sol as a binder. For example, the wear-resistant spray coating used for blast furnace lining is a material combined with silica sol, and the application effect is good. The setting of cementless castables is to disperse or unglue the superfine powder or colloid in the castables by adding them, so that the castables have a certain fluidity first, and then coagulate the castables by adding gel after mixing and vibration molding. Although the hardening process of cementless castables is slow, the strength also increases with the increase of temperature. Aluminum silicate based cementless castables will experience slight expansion after firing, while corundum based castables will experience shrinkage, but they have excellent high-temperature performance. The impurity content of cementless refractory castables is low, and their fire resistance, corrosion resistance, and high-temperature structural strength are superior to those of low cement series castables. The use of high aluminum and carbon containing materials as raw materials for this casting material will result in better performance.
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