Refractory castables composition

Composition of refractory castables

Fireramo has found that many of our customers are unclear about the composition of refractory castables and the factors that affect their performance. Refractory castables are made up of a variety of materials and it is customizable. Depending on your specific needs, composition adjustments and ratios can be made to achieve a customized refractory castable. Today Fireramo has compiled a list of the materials that make up refractory castables and the material choices that affect the performance of refractory castables.

What is a refractory castable?

Refractory castable material is a kind of unshaped refractory material used for the lining of high temperature industrial kilns and thermal equipment. It is characterized by easy construction, long service life, high strength, etc. It is widely used in metallurgy, building materials, chemical industry and other industries.

Refractory castable materials are a kind of composite material composed of many kinds of materials, which are mainly used in high-temperature industrial furnaces, heat treatment equipment lining and other places where high temperature resistance is required. The composition of refractory castables includes binding agent, aggregate, liquid additives, fiber material, expansion agent and flame retardant.

Basic composition of refractory castables

The basic components of refractory castables include aggregate, fine powder, binding agent and additives, which are the main components of refractory castables.

Aggregate

Aggregate is the main component of refractory castables, usually accounting for 60%~80% of the total volume. Aggregate selection pass is high refractoriness, high temperature stability of granular materials. Such as quartz, zirconium sand, aluminum powder. Aggregate species, particle size, shape and distribution of the performance of the castables have a great impact. Commonly used aggregates are high alumina bauxite clinker, magnesium sand, corundum, silicon carbide and so on.

Fine powder

Fine powder is the secondary component of refractory castables, usually accounting for 15%~30% of the total volume. The variety, particle size and distribution of fine powder also have great influence on the performance of the castables. Commonly used fine powder are high alumina bauxite fine powder, magnesia fine powder, corundum fine powder, silicon carbide fine powder and so on.

Binding agent

Binding agent is the binder of refractory castables, usually accounting for 5%~15% of the total volume. The type and dosage of binding agent have great influence on the performance of castables. Commonly used binding agents are cement, water glass, phosphate and so on.

Expansion agent

Expansion agent is an important component in refractory castables, which can make the refractory castables produce proper expansion at high temperature, thus enhancing its performance. Commonly used expansion agents include magnesium oxide, calcium oxide, etc., which can produce a certain volume expansion at high temperature to compensate for the contraction and thermal expansion of the refractory castables.

Flame retardant

Flame retardant is the component used to improve the flame retardant property of refractory castables. Commonly used flame retardants include aluminum, iron, zinc and other compounds, which can effectively prevent the flame from spreading and improve the flame retardant properties of refractory castables.

Liquid additives

Liquid additives play the role of regulating fluidity and improving performance in refractory castables. Commonly used liquid additives include water, acid, organic ester and so on. By adding the right amount of liquid additives, the construction performance and high temperature performance of refractory castables can be optimized.

Fiber material

Fiber material in the refractory castable plays the role of enhancing its mechanical properties. Commonly used fiber materials include glass fiber, carbon fiber and so on. These fiber materials have high strength, high modulus and other characteristics, which can significantly improve the tensile strength, shear resistance and other properties of refractory castables.

Additives

Additives are auxiliary materials added to improve certain properties of refractory castables, such as water reducing agent, dispersant, shrinkage inhibitor and so on.

High quality refractory castables for sale

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  Mullite castable
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  Fused silica ramming mass
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• Plastic Refractory Materials

Influence of materials on refractory castables

Selection of aggregate

The selection of aggregate should be determined according to the environment and requirements of the use of the castables. Generally speaking, the aggregate with good refractory performance, high strength and low porosity should be selected. At the same time, attention should also be paid to the particle size distribution of the aggregate to ensure the construction performance and strength of the castables.

Selection of fine powder

The selection of fine powder should be determined according to the use environment and requirements of the castables. Generally speaking, fine powder with good refractory performance, high strength and low porosity should be selected. At the same time, attention should also be paid to the particle size distribution of fine powder to ensure the construction performance and strength of the castables.

Selection of bonding agent

The selection of bonding agent should be determined according to the use environment and requirements of the castables. Generally speaking, the binding agent with good bonding performance, high temperature resistance and chemical erosion resistance should be selected. At the same time, attention should also be paid to the dosage of the binding agent to ensure the strength and construction performance of the castables.

Selection of additives

The selection of additives should be determined according to the use environment and requirements of the castables. Generally speaking, additives with good water reducing effect, dispersing effect and shrinkage prevention effect should be selected. At the same time, attention should also be paid to the dosage of additives to ensure the performance and construction performance of castables.

We believe that you have understood the composition of refractory castables, Fireramo as a manufacturer of refractory castables, we provide you with high quality refractory castables. Moreover, you can get customized refractory castables by telling us your requirements.