Corundum Wear-resistant Refractory Castable

Corundum wear-resistant and refractory castable

1. Introduction

Corundum wear-resistant refractory castable is a high-performance refractory material widely used in high-temperature industrial fields, such as metallurgy, building materials, chemical, power and other industries. Its main component is corundum (Al ₂ O ∝), which has high refractoriness, excellent wear resistance, and thermal shock resistance, and can maintain stable physical and chemical properties under extreme conditions. This article will provide a detailed introduction to the composition, performance characteristics, preparation process, and application of corundum wear-resistant and refractory castables.

2、 Composition of corundum wear-resistant and refractory castables

1. Corundum aggregate: Corundum is the main component of castables, usually using fused or sintered corundum. Corundum has a high melting point (2050 ℃), high hardness, and excellent chemical stability, which can effectively resist high temperatures and chemical erosion.

2. Bonding agent: Bonding agent is an important component of castables, and commonly used bonding agents include aluminate cement, phosphate, silica sol, etc. The function of the binder is to firmly bond the aggregate particles together, forming a dense structure.

3. Micro powder filler: Micro powder fillers such as silicon micro powder, alumina micro powder, etc. can fill the gaps between aggregates, improve the compactness and strength of castables.

4. Additives: Additives include dispersants, water reducers, accelerators, etc., used to improve the construction performance and final performance of castables. For example, dispersants can improve the flowability of castables, while water reducers can reduce water usage and increase strength.

3、 Performance characteristics of corundum wear-resistant and refractory castables

1. High refractoriness: The melting point of corundum is as high as 2050 ℃, which enables the castable to remain stable at extremely high temperatures and is suitable for lining high-temperature industrial furnaces.

2. Excellent wear resistance: The high hardness and dense structure of corundum make the casting material wear-resistant, able to resist material erosion and mechanical wear.

3. Good thermal shock resistance: Corundum castables can maintain structural integrity under alternating high and low temperatures, and are not easily cracked or peeled off.

4. Chemical stability: Corundum has excellent corrosion resistance to most acids, bases, and molten metals, and can be used for a long time in harsh chemical environments.

5. High strength: By optimizing the gradation of aggregates and the selection of binders, corundum castables have high room temperature strength and high temperature strength, and can withstand large mechanical loads.

4、 Preparation process of corundum wear-resistant and refractory castable

1. Raw material preparation: Select high-quality corundum aggregates, binders, micro powder fillers, and additives to ensure that the purity and particle size distribution of the raw materials meet the requirements.

2. Ingredients: According to the formula requirements, weigh various raw materials in proportion to ensure uniform distribution of each component.

3. Mixing: Place the weighed raw materials into the mixer, add an appropriate amount of water and additives, and mix thoroughly until a uniform slurry is formed.

4. Pouring molding: Pour the mixed slurry into the mold and use vibration or pressure to fully fill the mold with the slurry, forming a dense blank.

5. Maintenance: The formed body needs to be properly maintained, usually under certain temperature and humidity conditions, to fully hydrate the binder and improve the strength of the body.

6. Drying and sintering: The cured body needs to be dried and sintered to remove moisture and organic matter, further densify the body, and improve its final performance.

5、 Application of corundum wear-resistant and refractory castables

1. Metallurgical industry: Corundum castables are widely used as lining materials for high-temperature equipment such as blast furnaces, hot blast stoves, converters, and electric furnaces, which can effectively resist the erosion of high-temperature molten metals and slag.

2. Building materials industry: In high-temperature equipment such as cement kilns and glass kilns, corundum castables are used as lining materials, which can improve the service life and production efficiency of the equipment.

3. Chemical industry: In chemical reactors, cracking furnaces and other equipment, corundum castables can resist the erosion of corrosive gases and liquids, ensuring the long-term stable operation of the equipment.

4. Power industry: In the boiler, flue and other parts of thermal power plants, corundum castable can resist the erosion of high-temperature flue gas and ash, and improve the service life of equipment.

VI. Conclusion

Corundum wear-resistant refractory castable, as a high-performance refractory material, has high refractoriness, excellent wear resistance, good thermal shock resistance, and chemical stability, and is widely used in high-temperature industrial fields. By optimizing the selection of raw materials, formulation design, and preparation process, the performance of corundum castables can be further improved to meet the needs of different industrial environments. With the continuous development of high-temperature industry, the application prospects of corundum wear-resistant and refractory castables will be even broader.