Effect of cement content on refractory casting

In the process of producing refractory castings, cement is a common binder and plays an important role. Changing the cement content has a significant impact on the performance of refractory castings.

The role of cement in refractory castings

Cement – it's a binder, which can form a binding phase in refractory castings to increase the strength and hardness of the material. The chemical composition of cement can react with other components to form a gelling agent, which allows refractory castings to form a strong structure. Besides, cement can also improve fireproof performance, thermal stability and corrosion resistance of refractory castings.

Influence of cement content on the properties of refractory castings

1. Strength and hardness: Increase in cement content, as a rule, increases compressive strength and hardness of refractory castings. Appropriate cement content can promote the formation of gelling agents and increase the compactness and strength of the material.
2. Heat resistance: Adding cement can improve the heat resistance of refractory castings. Appropriate cement content allows for the formation of a stable structure and compound, increasing the material's resistance to high temperatures and thermal shock.
3. Corrosion resistance: Appropriate amount of cement can improve the corrosion resistance of refractory castings. The chemical composition of cement can react with some aggressive environments to form anti-corrosion compounds and reduce corrosion damage to refractory materials.

What problems will arise with low cement content in the cast material??

If the amount of cement, added to a refractory casting, too little, the initial strength of the casting is low, and the hardening time is too long, especially in winter, there will be no condensation; It reacts with aluminum and silicon in the feedstock to form a low-melting product, which affects the strength of the cast material during subsequent use.

Introduction of Cement Content in Various Types of Refractory Castings

Under normal circumstances, the amount of cement, added to castings with high alumina content, will be higher, than in castings with low cement content, and the ratio will be 10-12%, while the amount of cement, added to castings with low cement content, amounts to 6-7%, and in castings with ultra-low cement content, the amount of cement added to the material is 2-3%.

How to choose the correct cement content in monolithic casting refractory？

1. Conditions of use: According to the specific application conditions of the refractory casting, select the appropriate cement content. Various operating temperatures, Corrosion and thermal shock requirements may require adjustments to cement content.
2. Construction characteristics: Changes in cement content will affect the fluidity and constructability of refractory castings. It is necessary to select the appropriate cement content according to the construction process and requirements, to ensure the smooth progress of construction.
3. Economic Considerations: Cement is one of the important cost factors of refractory castings. When choosing a cement composition, the balance between operational requirements and economic costs must be fully considered..