Innovation and Technology


Alumina Carbon Brick

Alumina carbon brick, also known as aluminum carbon firebrick, is a carbon-based refractory material crafted from corundum (high-grade bauxite, mullite, etc.) aggregates and fines, graphite, binders, and additives. Classified by their production process, alumina carbon composite refractory bricks are categorized as either burned aluminum carbon bricks or unburned aluminum carbon bricks.

  • Robust Corrosion Resistance
    Alumina carbon bricks exhibit exceptional resistance to corrosion, enabling them to withstand aggressive and corrosive environments effectively.
  • Excellent Thermal Shock Stability
    These bricks demonstrate remarkable stability when exposed to rapid temperature fluctuations, ensuring they can endure the stresses caused by sudden changes in heat.
  • Elevated Strength
    Alumina carbon bricks possess remarkable strength, allowing them to endure mechanical and thermal loads without compromising structural integrity.
  • Enhanced Thermal Conductivity
    With high thermal conductivity, these bricks efficiently transfer and distribute heat, contributing to efficient thermal management in various high-temperature applications.

High Alumina Brick – Alumina Carbon Brick

This type of refractory material combines the advantages of alumina and carbon, boasting exceptional heat resistance and corrosion resistance, making it suitable for high-temperature industrial environments.
The manufacturing process of alumina carbon bricks involves grinding high-grade bauxite and other raw materials into aggregates and fines, followed by blending them with graphite, binders, and additives. The addition of graphite enhances carbon content, thereby elevating the refractoriness and thermal conductivity of the material. Binders and additives ensure proper cohesion and formability of the raw mix. The resulting mixture can be shaped through sintering or non-sintering processes.
Sintered aluminum carbon bricks undergo high-temperature sintering to stabilize their internal structure, resulting in outstanding heat resistance and mechanical strength. Such bricks are commonly employed in equipment requiring resilience to high temperatures and severe corrosive environments, such as metallurgical furnaces and refractory kilns. On the other hand, unburned aluminum carbon bricks retain more carbon characteristics as they do not undergo sintering after forming. They offer superior seismic resistance and electrical conductivity, making them suitable for specific high-temperature applications.
Alumina carbon bricks represent a versatile refractory material, leveraging their unique composition to play a crucial role in high-temperature industrial applications, ensuring stable equipment operation and longevity.

Burned Micro-pores Alumina-Carbon Brick

The primary application of the Fired Micro-Porous Alumina-Carbon Brick centers around its use in the operational lining of the bosh area situated above the air pipe and belly. This specialized brick type possesses a distinctive attribute in the form of micro-pores, which are meticulously designed for optimal performance. These micro-pores exhibit an average diameter of less than 1µm, showcasing an exceptional engineering feat. Furthermore, the brick showcases an impressive characteristic wherein the volume percentage of pores measuring less than 1µm stands at an impressive minimum of 70%.

In practical terms, this particular brick variant excels in its designated role due to its specific micro-porous composition. The controlled pore size distribution, particularly with pores less than 1µm, contributes significantly to its unique functionality. This is a crucial factor as it enhances the brick’s effectiveness in various high-temperature applications.
The utilization of the Fired Micro-Porous Alumina-Carbon Brick is not only limited to its designated application but extends to broader contexts. Its adaptability enables its successful integration into diverse scenarios requiring high-temperature resistance and structural integrity.
The Fired Micro-Pores Alumina-Carbon Brick showcases an impressive array of characteristics tailored to meet the demanding requirements of its designated application, making it an asset in various high-temperature environments.

Burned Microporous Alumina-Carbon Brick Technique Data
Al 2 O 3 ,% ≥656055
C,% ≥11119
Fe 2 O 3 ,% ≤
Bulk density, g/cm 3 ≥2.852.652.55
Apparent porosity, % ≤161718
Cold crushing strength, Mpa ≥706050
Refractoriness under load(0.2Mpa, Ti) °C ≥165016501600
Thermal shock stability, times ≥100100100
Iron liquid corrosion index,% ≤234
Air permeability, mDa ≤0.522
Average pore size, mm≤0.511
Less than 1mm Pores ​​volume percentage % ≥807070
Anti-alkali performance,% ≤101015
Thermal conductivity, w/m·k ≥131313
Burned Microporous Alumina-Carbon Brick features

(1) Demonstrating minimal porosity and low air permeability.
(2) Exhibiting elevated compressive strength and superior thermal conductivity.
(3) Displaying exceptional resistance to slag, alkali, and erosion.
(4) Showcasing remarkable thermal shock resistance and stability.

Aluminium Carbon Refractories used for Continuous Casting Tundish

Primarily encompassing upper nozzles, lower nozzles, and stoppers, collectively known as specialized aluminum carbon bricks, these components find their origin in raw materials like corundum and graphite. During the production process, a measured quantity of additives is blended into the raw materials. The binder for alumina carbon nozzles and stoppers is derived from phenolic resin. Post-mixing, shaping, and drying, the resultant green structures are subjected to non-oxidizing kiln firing at a temperature of 1350 °C. To enhance durability, an anti-oxidation coating can be applied after machining, extending their operational lifespan.

Premium Aluminum Carbon Refractories for Continuous Casting Tundish

(1) Ensuring structural integrity and safe utilization.
(2) Facilitating optimal molten steel purification.
(3) Exuding robust strength and excellent resistance against molten steel and slag erosion.
(4) Demonstrating impressive wear resistance, thereby elongating the service life.

Applications of Aluminum Carbon Bricks

Aluminum carbon bricks exhibit their prowess across various thermal equipment, including blast furnaces, continuous casting tundishes (comprising long nozzles, submerged nozzles, stoppers, upper and lower nozzle bricks, and slide plate bricks), ladles, hot metal containers, and torpedoes.

Manufacturing Process of Aluminum Carbon Bricks

Aluminum carbon bricks exhibit their prowess across various thermal equipment, including blast furnaces, continuous casting tundishes (comprising long nozzles, submerged nozzles, stoppers, upper and lower nozzle bricks, and slide plate bricks), ladles, hot metal containers, and torpedoes.

Manufacturing Process of Aluminum Carbon Bricks
Raw Materials and Binders for Aluminum Carbon Bricks

The composition of unfired aluminum carbon bricks encompasses commonly employed materials like corundum, mullite, high-alumina bauxite clinker of prime quality, graphite, SiC, and Si powder. These are adeptly bonded using various agents like resin, tar, asphalt, and similar substances. Tailoring the choice of raw materials and binders based on application specifics is pivotal for producing customized aluminum carbon bricks.

The aforementioned encapsulates a concise overview of aluminum carbon bricks. Should the need arise for procuring these bricks, AGRM Refractory stands prepared to furnish you with superlative quality products at competitive rates. Moreover, our capability extends to crafting refractory items that match your specifications, while also offering comprehensive refractory materials and engineering solutions.

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